Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1108 files changed, 31885 insertions, 0 deletions

diff --git a/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A1.js b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A1.js
new file mode 100644
index 0000000000..d74defe0d0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A1.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String has property prototype
+es5id: 15.5.3.1_A1
+description: Checking String.hasOwnProperty('prototype')
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.hasOwnProperty('prototype'))) {
+  throw new Test262Error('#1: String.hasOwnProperty(\'prototype\') return true. Actual: ' + String.hasOwnProperty('prototype'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A2.js b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A2.js
new file mode 100644
index 0000000000..83ff7dfa62
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A2.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype property has the attribute DontEnum
+es5id: 15.5.3.1_A2
+description: Checking if enumerating the String.prototype property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.hasOwnProperty('prototype'))) {
+  throw new Test262Error('#0: String.hasOwnProperty(\'prototype\') return true. Actual: ' + String.hasOwnProperty('prototype'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.propertyIsEnumerable('prototype')) {
+  throw new Test262Error('#1: String.propertyIsEnumerable(\'prototype\') return false. Actual: ' + String.propertyIsEnumerable('prototype'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String) {
+  if (p === "prototype") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String){ if (p==="prototype") count++;}; count === 0. Actual: count ===' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A3.js b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A3.js
new file mode 100644
index 0000000000..87f0a07b0c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A3.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype property has the attribute DontDelete
+es5id: 15.5.3.1_A3
+description: Checking if deleting the String.prototype property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.hasOwnProperty('prototype'))) {
+  throw new Test262Error('#1: String.hasOwnProperty(\'prototype\') return true. Actual: ' + String.hasOwnProperty('prototype'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+verifyNotConfigurable(String, "prototype");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+try {
+  if ((delete String.prototype) !== false) {
+    throw new Test262Error('#2: String.prototype has the attribute DontDelete');
+  }
+} catch (e) {
+  if (e instanceof Test262Error) throw e;
+  assert(e instanceof TypeError);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (!(String.hasOwnProperty('prototype'))) {
+  throw new Test262Error('#3: delete String.prototype; String.hasOwnProperty(\'prototype\') return true. Actual: ' + String.hasOwnProperty('prototype'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A4.js b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A4.js
new file mode 100644
index 0000000000..a4e7014e42
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/S15.5.3.1_A4.js
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype property has the attribute ReadOnly
+es5id: 15.5.3.1_A4
+description: Checking if varying the String.prototype property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.hasOwnProperty('prototype'))) {
+  throw new Test262Error('#1: String.hasOwnProperty(\'prototype\') return true. Actual: ' + String.hasOwnProperty('prototype'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype;
+
+verifyNotWritable(String, "prototype", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype; String.prototype = function(){return "shifted";}; String.prototype === __obj. Actual: String.prototype ===' + String.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A1.js b/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A1.js
new file mode 100644
index 0000000000..55437f96a7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A1.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String prototype object is itself a String object (its [[Class]] is "String")
+es5id: 15.5.4_A1
+description: >
+    first we delete String.prototype.toString cause it overrides
+    Object prototype toString.  Object.prototype.toString returns
+    [object+[[class]]+]
+---*/
+
+delete String.prototype.toString;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.toString() !== "[object " + "String" + "]") {
+  throw new Test262Error('#1: delete String.prototype.toString; String.prototype.toString() === "[object "+"String"+"]". Actual: String.prototype.toString() ===' + String.prototype.toString());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A2.js b/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A2.js
new file mode 100644
index 0000000000..3369b4ecf3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A2.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String prototype object is itself a String object whose value is an empty string
+es5id: 15.5.4_A2
+description: Checking String.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype != "") {
+  throw new Test262Error('#1: String.prototype =="". Actual: String.prototype ==' + String.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A3.js b/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A3.js
new file mode 100644
index 0000000000..33540be3a4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/S15.5.4_A3.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The value of the internal [[Prototype]] property of the String prototype
+    object is the Object prototype object (15.2.3.1)
+es5id: 15.5.4_A3
+description: Checking Object.prototype.isPrototypeOf(String.prototype)
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(Object.prototype.isPrototypeOf(String.prototype))) {
+  throw new Test262Error('#1: Object.prototype.isPrototypeOf(String.prototype) return true. Actual: ' + Object.prototype.isPrototypeOf(String.prototype));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+delete String.prototype.toString;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toString() != "[object " + "String" + "]") {
+  throw new Test262Error('#2: delete String.prototype.toString; String.prototype.toString() == "[object "+"String"+"]". Actual: String.prototype.toString() ==' + String.prototype.toString());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/browser.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/length.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/length.js
new file mode 100644
index 0000000000..c7b43eed8a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/length.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.1.3.27
+description: Length of String.prototype[ @@iterator ]
+info: |
+    ES6 Section 17:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this value
+    is equal to the largest number of named arguments shown in the subclause
+    headings for the function description, including optional parameters.
+
+    [...]
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+features: [Symbol.iterator]
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype[Symbol.iterator].length, 0);
+
+verifyNotEnumerable(String.prototype[Symbol.iterator], 'length');
+verifyNotWritable(String.prototype[Symbol.iterator], 'length');
+verifyConfigurable(String.prototype[Symbol.iterator], 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/name.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/name.js
new file mode 100644
index 0000000000..29f1ffc52e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/name.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.1.3.27
+description: Descriptor for `name` property
+info: |
+  The value of the name property of this function is "[Symbol.iterator]".
+
+  ES6 Section 17: ECMAScript Standard Built-in Objects
+
+  Every built-in Function object, including constructors, that is not
+  identified as an anonymous function has a name property whose value is a
+  String. Unless otherwise specified, this value is the name that is given to
+  the function in this specification.
+
+  [...]
+
+  Unless otherwise specified, the name property of a built-in Function
+  object, if it exists, has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+features: [Symbol.iterator]
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype[Symbol.iterator].name, '[Symbol.iterator]');
+
+verifyNotEnumerable(String.prototype[Symbol.iterator], 'name');
+verifyNotWritable(String.prototype[Symbol.iterator], 'name');
+verifyConfigurable(String.prototype[Symbol.iterator], 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/not-a-constructor.js
new file mode 100644
index 0000000000..33fdc254d4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype[Symbol.iterator] does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, Symbol, Symbol.iterator, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype[Symbol.iterator]),
+  false,
+  'isConstructor(String.prototype[Symbol.iterator]) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype[Symbol.iterator]();
+}, '`new String.prototype[Symbol.iterator]()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/prop-desc.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/prop-desc.js
new file mode 100644
index 0000000000..afea256f3e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/prop-desc.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.1.3.27
+description: Property descriptor
+info: |
+    ES6 Section 17
+
+    Every other data property described in clauses 18 through 26 and in Annex
+    B.2 has the attributes { [[Writable]]: true, [[Enumerable]]: false,
+    [[Configurable]]: true } unless otherwise specified.
+features: [Symbol.iterator]
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(typeof String.prototype[Symbol.iterator], 'function');
+verifyNotEnumerable(String.prototype, Symbol.iterator);
+verifyWritable(String.prototype, Symbol.iterator);
+verifyConfigurable(String.prototype, Symbol.iterator);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/shell.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/this-val-non-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/this-val-non-obj-coercible.js
new file mode 100644
index 0000000000..eec6d2eb74
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/this-val-non-obj-coercible.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.1.3.27
+description: The `this` value cannot be coerced into an object
+info: |
+    1. Let O be RequireObjectCoercible(this value).
+    2. Let S be ToString(O).
+    3. ReturnIfAbrupt(S).
+features: [Symbol.iterator]
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype[Symbol.iterator].call(undefined);
+});
+
+assert.throws(TypeError, function() {
+  String.prototype[Symbol.iterator].call(null);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/this-val-to-str-err.js b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/this-val-to-str-err.js
new file mode 100644
index 0000000000..3a9f6c4cb8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/Symbol.iterator/this-val-to-str-err.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 25.1.3.27
+description: Error thrown coercing `this` value to a string
+info: |
+    1. Let O be RequireObjectCoercible(this value).
+    2. Let S be ToString(O).
+    3. ReturnIfAbrupt(S).
+features: [Symbol.iterator]
+---*/
+
+var obj = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype[Symbol.iterator].call(obj);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/browser.js b/js/src/tests/test262/built-ins/String/prototype/at/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/index-argument-tointeger.js b/js/src/tests/test262/built-ins/String/prototype/at/index-argument-tointeger.js
new file mode 100644
index 0000000000..1265d2412b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/index-argument-tointeger.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.at( index )
+
+  Let relativeIndex be ? ToInteger(index).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let valueOfCallCount = 0;
+let index = {
+  valueOf() {
+    valueOfCallCount++;
+    return 1;
+  }
+};
+
+let s = "01";
+
+assert.sameValue(s.at(index), '1', 's.at({valueOf() {valueOfCallCount++; return 1;}}) must return 1');
+assert.sameValue(valueOfCallCount, 1, 'The value of `valueOfCallCount` is 1');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger-invalid.js b/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger-invalid.js
new file mode 100644
index 0000000000..64a31c0120
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger-invalid.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.at( index )
+
+  Let relativeIndex be ? ToInteger(index).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let s = "01";
+
+assert.throws(TypeError, () => {
+  s.at(Symbol());
+}, '`s.at(Symbol())` throws TypeError');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger.js b/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger.js
new file mode 100644
index 0000000000..c7e56a2a94
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.at( index )
+
+  Let relativeIndex be ? ToInteger(index).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let s = "01";
+
+assert.sameValue(s.at(false), '0', 's.at(false) must return 0');
+assert.sameValue(s.at(null), '0', 's.at(null) must return 0');
+assert.sameValue(s.at(undefined), '0', 's.at(undefined) must return 0');
+assert.sameValue(s.at(""), '0', 's.at("") must return 0');
+assert.sameValue(s.at(function() {}), '0', 's.at(function() {}) must return 0');
+assert.sameValue(s.at([]), '0', 's.at([]) must return 0');
+
+assert.sameValue(s.at(true), '1', 's.at(true) must return 1');
+assert.sameValue(s.at("1"), '1', 's.at("1") must return 1');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/length.js b/js/src/tests/test262/built-ins/String/prototype/at/length.js
new file mode 100644
index 0000000000..d552c459bd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/length.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  String.prototype.at.length value and descriptor.
+info: |
+  String.prototype.at( index )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+assert.sameValue(
+  String.prototype.at.length, 1,
+  'The value of String.prototype.at.length is 1'
+);
+
+verifyNotEnumerable(String.prototype.at, 'length');
+verifyNotWritable(String.prototype.at, 'length');
+verifyConfigurable(String.prototype.at, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/name.js b/js/src/tests/test262/built-ins/String/prototype/at/name.js
new file mode 100644
index 0000000000..46b8a44410
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  String.prototype.at.name value and descriptor.
+info: |
+  String.prototype.at( index )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+assert.sameValue(
+  String.prototype.at.name, 'at',
+  'The value of String.prototype.at.name is "at"'
+);
+
+verifyProperty(String.prototype.at, 'name', {
+  enumerable: false,
+  writable: false,
+  configurable: true
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/prop-desc.js b/js/src/tests/test262/built-ins/String/prototype/at/prop-desc.js
new file mode 100644
index 0000000000..2cc96c993b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/prop-desc.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.at( index )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+assert.sameValue(
+  typeof String.prototype.at,
+  'function',
+  'The value of `typeof String.prototype.at` is "function"'
+);
+
+verifyProperty(String.prototype, 'at', {
+  enumerable: false,
+  writable: true,
+  configurable: true
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/at/return-abrupt-from-this.js
new file mode 100644
index 0000000000..0dc4011fce
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/return-abrupt-from-this.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  Return abrupt from RequireObjectCoercible(this value).
+info: |
+  String.prototype.at( index )
+
+  Let O be ? RequireObjectCoercible(this value).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+assert.throws(TypeError, () => {
+  String.prototype.at.call(undefined);
+}, '`String.prototype.at.call(undefined)` throws TypeError');
+
+assert.throws(TypeError, () => {
+  String.prototype.at.call(null);
+}, '`String.prototype.at.call(null)` throws TypeError');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/returns-code-unit.js b/js/src/tests/test262/built-ins/String/prototype/at/returns-code-unit.js
new file mode 100644
index 0000000000..08b1e049e2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/returns-code-unit.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-String.prototype.at
+description: >
+  The method should return an Iterator instance.
+info: |
+  String.prototype.at ( )
+
+  Let O be ? ToObject(this value).
+  Let len be ? LengthOfStringLike(O).
+  Let relativeIndex be ? ToInteger(index).
+  If relativeIndex ≥ 0, then
+    Let k be relativeIndex.
+  Else,
+    Let k be len + relativeIndex.
+  If k < 0 or k ≥ len, then return undefined.
+  Return ? Get(O, ! ToString(k)).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let s = "12\uD80034";
+
+assert.sameValue(s.at(0), "1", 's.at(0) must return "1"');
+assert.sameValue(s.at(1), "2", 's.at(1) must return "2"');
+assert.sameValue(s.at(2), "\uD800", 's.at(2) must return "\\uD800"');
+assert.sameValue(s.at(3), "3", 's.at(3) must return "3"');
+assert.sameValue(s.at(4), "4", 's.at(4) must return "4"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/returns-item-relative-index.js b/js/src/tests/test262/built-ins/String/prototype/at/returns-item-relative-index.js
new file mode 100644
index 0000000000..9c3360f266
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/returns-item-relative-index.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-String.prototype.at
+description: >
+  Returns the item value at the specified relative index
+info: |
+  String.prototype.at ( )
+
+  Let O be ? ToObject(this value).
+  Let len be ? LengthOfStringLike(O).
+  Let relativeIndex be ? ToInteger(index).
+  If relativeIndex ≥ 0, then
+    Let k be relativeIndex.
+  Else,
+    Let k be len + relativeIndex.
+  If k < 0 or k ≥ len, then return undefined.
+  Return ? Get(O, ! ToString(k)).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let s = "12345";
+
+assert.sameValue(s.at(0), "1", 's.at(0) must return "1"');
+assert.sameValue(s.at(-1), "5", 's.at(-1) must return "5"');
+assert.sameValue(s.at(-3), "3", 's.at(-3) must return "3"');
+assert.sameValue(s.at(-4), "2", 's.at(-4) must return "2"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/returns-item.js b/js/src/tests/test262/built-ins/String/prototype/at/returns-item.js
new file mode 100644
index 0000000000..c71ce2d605
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/returns-item.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-String.prototype.at
+description: >
+  Returns the item value at the specified index
+info: |
+  String.prototype.at ( )
+
+  Let O be ? ToObject(this value).
+  Let len be ? LengthOfStringLike(O).
+  Let relativeIndex be ? ToInteger(index).
+  If relativeIndex ≥ 0, then
+    Let k be relativeIndex.
+  Else,
+    Let k be len + relativeIndex.
+  If k < 0 or k ≥ len, then return undefined.
+  Return ? Get(O, ! ToString(k)).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let s = "12345";
+
+assert.sameValue(s.at(0), "1", 's.at(0) must return "1"');
+assert.sameValue(s.at(1), "2", 's.at(1) must return "2"');
+assert.sameValue(s.at(2), "3", 's.at(2) must return "3"');
+assert.sameValue(s.at(3), "4", 's.at(3) must return "4"');
+assert.sameValue(s.at(4), "5", 's.at(4) must return "5"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/returns-undefined-for-out-of-range-index.js b/js/src/tests/test262/built-ins/String/prototype/at/returns-undefined-for-out-of-range-index.js
new file mode 100644
index 0000000000..4be2a96b67
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/returns-undefined-for-out-of-range-index.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  Creates an iterator from a custom object.
+info: |
+  String.prototype.at( index )
+
+  If k < 0 or k ≥ len, then return undefined.
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let s = "";
+
+assert.sameValue(s.at(-2), undefined, 's.at(-2) must return undefined'); // wrap around the end
+assert.sameValue(s.at(0), undefined, 's.at(0) must return undefined');
+assert.sameValue(s.at(1), undefined, 's.at(1) must return undefined');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/shell.js b/js/src/tests/test262/built-ins/String/prototype/at/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/browser.js b/js/src/tests/test262/built-ins/String/prototype/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1.1.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1.1.js
new file mode 100644
index 0000000000..82a34b6a53
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1.1.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt() can accept many arguments
+es5id: 15.5.4.4_A1.1
+description: Checking by using eval
+---*/
+
+function __FACTORY() {
+  this.toString = function() {
+    return "wizard";
+  };
+};
+
+__FACTORY.prototype.charAt = String.prototype.charAt;
+
+var __instance = new __FACTORY;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.charAt(eval("1"), true, null, {}) !== "i") {
+  throw new Test262Error('#1: __instance.charAt(eval("1"),true,null,{})=== "i". Actual: ' + __instance.charAt(eval("1"), true, null, {}));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A10.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A10.js
new file mode 100644
index 0000000000..3c5e38db4c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.charAt.length property has the attribute ReadOnly
+es5id: 15.5.4.4_A10
+description: >
+    Checking if varying the String.prototype.charAt.length property
+    fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.charAt.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.charAt.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.charAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.charAt.length;
+
+verifyNotWritable(String.prototype.charAt, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.charAt.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.charAt.length; String.prototype.charAt.length = function(){return "shifted";}; String.prototype.charAt.length === __obj. Actual: ' + String.prototype.charAt.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A11.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A11.js
new file mode 100644
index 0000000000..6e29517e39
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the charAt method is 1
+es5id: 15.5.4.4_A11
+description: Checking String.prototype.charAt.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.charAt.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.charAt.hasOwnProperty("length") return true. Actual: ' + String.prototype.charAt.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.charAt.length !== 1) {
+  throw new Test262Error('#2: String.prototype.charAt.length === 1. Actual: ' + String.prototype.charAt.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T1.js
new file mode 100644
index 0000000000..72a0bd2238
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T1
+description: pos is false and true, and instance is object
+---*/
+
+var __instance = new Object(42);
+
+__instance.charAt = String.prototype.charAt;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.charAt(false) + __instance.charAt(true) !== "42") {
+  throw new Test262Error('#1: __instance = new Object(42); __instance.charAt = String.prototype.charAt;  __instance = new Object(42); __instance.charAt = String.prototype.charAt; __instance.charAt(false)+__instance.charAt(true) === "42". Actual: ' + __instance.charAt(false) + __instance.charAt(true));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T10.js
new file mode 100644
index 0000000000..ac98653b3f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T10.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T10
+description: Call charAt() function with object argument
+---*/
+
+var __obj = {
+  toString: function() {
+    return 1;
+  }
+}
+var __str = "lego";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.charAt(__obj) !== "e") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return 1;}}; var __str = "lego"; __str.charAt(__obj) === "e". Actual: ' + __str.charAt(__obj));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T2.js
new file mode 100644
index 0000000000..f6d675d698
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T2.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T2
+description: pos is equation with false and true, and instance is Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.charAt = String.prototype.charAt;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.charAt(false) + __instance.charAt(true) + __instance.charAt(true + 1) !== "fal") {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.charAt = String.prototype.charAt;  __instance = new Boolean; __instance.charAt = String.prototype.charAt; __instance.charAt(false)+__instance.charAt(true)+__instance.charAt(true+1) === "fal". Actual: ' + __instance.charAt(false) + __instance.charAt(true) + __instance.charAt(true + 1));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T4.js
new file mode 100644
index 0000000000..6c6a051597
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T4.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T4
+description: Call charAt() function without argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger() evaluates to 0 charAt() evaluates to charAt(0)
+if ("lego".charAt() !== "l") {
+  throw new Test262Error('#1: "lego".charAt() === "l". Actual: "lego".charAt() ===' + ("lego".charAt()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T5.js
new file mode 100644
index 0000000000..138d7948f5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T5
+description: Call charAt() function with null argument of function object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(null) evaluates to 0 charAt() evaluates to charAt(0)
+if (function() {
+    return "lego"
+  }().charAt(null) !== "l") {
+  throw new Test262Error('#1: function(){return "lego"}().charAt(null) === "l". Actual: function(){return "lego"}().charAt(null) ===' + function() {
+    return "lego"
+  }().charAt(null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T6.js
new file mode 100644
index 0000000000..d207385458
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T6
+description: >
+    Call charAt() function with x argument of new String object, where
+    x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(undefined) evaluates to 0 charAt() evaluates to charAt(0)
+if (new String("lego").charAt(x) !== "l") {
+  throw new Test262Error('#1: var x; new String("lego").charAt(x) === "l". Actual: new String("lego").charAt(x) ===' + new String("lego").charAt(x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T7.js
new file mode 100644
index 0000000000..73c0998587
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T7
+description: Call charAt() function with undefined argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(undefined) evaluates to 0 charAt() evaluates to charAt(0)
+if (String("lego").charAt(undefined) !== "l") {
+  throw new Test262Error('#1: String("lego").charAt(undefined) === "l". Actual: String("lego").charAt(undefined) ===' + String("lego").charAt(undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T8.js
new file mode 100644
index 0000000000..8c4bc9dc0f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T8.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T8
+description: Call charAt() function with void 0 argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(void 0) evaluates to 0 charAt() evaluates to charAt(0)
+if (String(42).charAt(void 0) !== "4") {
+  throw new Test262Error('#1: String(42).charAt(void 0) === "4". Actual: String(42).charAt(void 0) ===' + String(42).charAt(void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T9.js
new file mode 100644
index 0000000000..c45374025b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A1_T9.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt(pos)
+es5id: 15.5.4.4_A1_T9
+description: >
+    Call charAt() function with function(){}() argument of string
+    object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(undefined) evaluates to 0 charAt() evaluates to charAt(0)
+if (new String(42).charAt(function() {}()) !== "4") {
+  throw new Test262Error('#1: new String(42).charAt(function(){}()) === "4". Actual: new String(42).charAt(function(){}()) ===' + new String(42).charAt(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A2.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A2.js
new file mode 100644
index 0000000000..139d75b06d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A2.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    When String.prototype.charAt(pos) calls if ToInteger(pos) less than 0 the
+    empty string returns
+es5id: 15.5.4.4_A2
+description: Call charAt(pos) with negative pos
+---*/
+
+function __FACTORY() {};
+
+__FACTORY.prototype.charAt = String.prototype.charAt;
+
+var __instance = new __FACTORY;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.charAt(-1) !== "") {
+  throw new Test262Error('#1: __instance.charAt(-1) === "". Actual: __instance.charAt(-1) ===' + __instance.charAt(-1));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A3.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A3.js
new file mode 100644
index 0000000000..dd32dcbd8b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A3.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    When String.prototype.charAt(pos) calls if ToInteger(pos) not less than
+    ToString(this value) the empty string returns
+es5id: 15.5.4.4_A3
+description: pos is bigger of string length
+---*/
+
+var __instance = new String("ABC");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.charAt(3) !== "") {
+  throw new Test262Error('#1: __instance = new String("ABC"); __instance.charAt(3) === "". Actual: __instance.charAt(3) ===' + __instance.charAt(3));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T1.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T1.js
new file mode 100644
index 0000000000..7bd0ab8cb4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T1.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    If pos is a value of Number type that is an integer, then the result of
+    x.charAt(pos) is equal to the result of x.substring(pos, pos+1)
+es5id: 15.5.4.4_A4_T1
+description: Compare results of x.charAt(pos) and x.substring(pos, pos+1)
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var i = 0; i < 6; i++) {
+  if ("ABC\u0041\u0042\u0043".charAt(i) !== "\u0041\u0042\u0043ABC".substring(i, i + 1)) {
+    throw new Test262Error('#' + i + ': "ABC\\u0041\\u0042\\u0043".charAt(' + i + ') === "\\u0041\\u0042\\u0043ABC".substring(' + i + ', ' + (i + 1) + '). Actual: "ABC\\u0041\\u0042\\u0043".charAt(' + i + ') ===' + ("ABC\u0041\u0042\u0043".charAt(i)));
+  }
+}
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T2.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T2.js
new file mode 100644
index 0000000000..4624ccef9f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T2.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    If pos is a value of Number type that is an integer, then the result of
+    x.charAt(pos) is equal to the result of x.substring(pos, pos+1)
+es5id: 15.5.4.4_A4_T2
+description: >
+    Compare results of x.charAt(pos) and x.substring(pos, pos+1), wheb
+    pos is smaller of zero
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var i = -2; i < 0; i++) {
+  if ("ABC\u0041\u0042\u0043".charAt(i) !== "\u0041\u0042\u0043ABC".substring(i, i + 1)) {
+    throw new Test262Error('#' + (i + 2) + ': "ABC\\u0041\\u0042\\u0043".charAt(' + i + ') === "\\u0041\\u0042\\u0043ABC".substring(' + i + ', ' + (i + 1) + '). Actual: "ABC\\u0041\\u0042\\u0043".charAt(' + i + ') ===' + ("ABC\u0041\u0042\u0043".charAt(i)));
+  }
+}
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T3.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T3.js
new file mode 100644
index 0000000000..da7368b170
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A4_T3.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    If pos is a value of Number type that is an integer, then the result of
+    x.charAt(pos) is equal to the result of x.substring(pos, pos+1)
+es5id: 15.5.4.4_A4_T3
+description: >
+    Compare results of x.charAt(pos) and x.substring(pos, pos+1), wheb
+    pos is bigger string length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var i = 6; i < 8; i++) {
+  if ("ABC\u0041\u0042\u0043".charAt(i) !== "\u0041\u0042\u0043ABC".substring(i, i + 1)) {
+    throw new Test262Error('#' + (i - 5) + ': "ABC\\u0041\\u0042\\u0043".charAt(' + i + ') === "\\u0041\\u0042\\u0043ABC".substring(' + i + ', ' + (i + 1) + '). Actual: "ABC\\u0041\\u0042\\u0043".charAt(' + i + ') ===' + ("ABC\u0041\u0042\u0043".charAt(i)));
+  }
+}
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A5.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A5.js
new file mode 100644
index 0000000000..37320912bb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A5.js
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    When String.prototype.charAt(pos) calls first calls ToString, giving it
+    the this value as its argument
+es5id: 15.5.4.4_A5
+description: Change toString function, it trow exception, and call charAt()
+---*/
+
+var __obj = {
+  valueOf: 1,
+  toString: function() {
+    throw 'intostring'
+  },
+  charAt: String.prototype.charAt
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.charAt();
+  throw new Test262Error('#1: __obj={valueOf:1,toString:function(){throw \'intostring\'},charAt:String.prototype.charAt}; "var x = __obj.charAt()" lead to throwing exception');
+} catch (e) {
+  if (e !== 'intostring') {
+    throw new Test262Error('#1.1: Exception === \'intostring\'. Actual: exception ===' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A6.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A6.js
new file mode 100644
index 0000000000..6298c66ddc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt has not prototype property
+es5id: 15.5.4.4_A6
+description: Checking String.prototype.charAt.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.charAt.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.charAt.prototype === undefined. Actual: ' + String.prototype.charAt.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A7.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A7.js
new file mode 100644
index 0000000000..0d79526df8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charAt can't be used as constructor
+es5id: 15.5.4.4_A7
+description: Checking if creating the String.prototype.charAt object fails
+---*/
+
+var __FACTORY = String.prototype.charAt;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.charAt; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.2: undefined = 1 throw a TypeError. Actual: ' + (e));
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A8.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A8.js
new file mode 100644
index 0000000000..c7a23c927e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.charAt.length property has the attribute DontEnum
+es5id: 15.5.4.4_A8
+description: >
+    Checking if enumerating the String.prototype.charAt.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.charAt.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.charAt.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.charAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.charAt.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.charAt.propertyIsEnumerable(\'length\') return false. Actual: ' + String.prototype.charAt.propertyIsEnumerable('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.charAt) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.charAt){if (p==="length") count++;}; count === 0. Actual: count ===' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A9.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A9.js
new file mode 100644
index 0000000000..b75e7537e4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S15.5.4.4_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.charAt.length property does not have the attribute
+    DontDelete
+es5id: 15.5.4.4_A9
+description: >
+    Checking if deleting the String.prototype.charAt.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.charAt.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.charAt.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.charAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.charAt.length) {
+  throw new Test262Error('#1: delete String.prototype.charAt.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.charAt.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.charAt.length; String.prototype.charAt.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.charAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S9.4_A1.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S9.4_A1.js
new file mode 100644
index 0000000000..37aa8620dc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S9.4_A1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: If ToNumber(value) is NaN, ToInteger(value) returns +0
+es5id: 9.4_A1
+description: >
+    Check what position is defined by Number.NaN in string "abc":
+    "abc".charAt(Number.NaN)
+---*/
+
+// CHECK#1
+if ("abc".charAt(Number.NaN) !== "a") {
+  throw new Test262Error('#1: "abc".charAt(Number.NaN) === "a". Actual: ' + ("abc".charAt(Number.NaN)));
+}
+
+// CHECK#2
+if ("abc".charAt("x") !== "a") {
+  throw new Test262Error('#2: "abc".charAt("x") === "a". Actual: ' + ("abc".charAt("x")));
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/S9.4_A2.js b/js/src/tests/test262/built-ins/String/prototype/charAt/S9.4_A2.js
new file mode 100644
index 0000000000..3a0fdfdf94
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/S9.4_A2.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    If ToNumber(value) is +0, -0, +Infinity, or -Infinity,
+    return ToNumber(value)
+es5id: 9.4_A2
+description: >
+    Check what position is defined by Number.NaN in string "abc":
+    "abc".charAt(Number.NaN)
+---*/
+
+// CHECK#1
+if ("abc".charAt(0.0) !== "a") {
+  throw new Test262Error('#1: "abc".charAt(0.0) === "a". Actual: ' + ("abc".charAt(0.0)));
+}
+
+// CHECK#2
+if ("abc".charAt(-0.0) !== "a") {
+  throw new Test262Error('#2: "abc".charAt(-0.0) === "a". Actual: ' + ("abc".charAt(-0.0)));
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/browser.js b/js/src/tests/test262/built-ins/String/prototype/charAt/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/name.js b/js/src/tests/test262/built-ins/String/prototype/charAt/name.js
new file mode 100644
index 0000000000..13a245e2fc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.1
+description: >
+  String.prototype.charAt.name is "charAt".
+info: |
+  String.prototype.charAt ( pos )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.charAt.name, "charAt");
+
+verifyNotEnumerable(String.prototype.charAt, "name");
+verifyNotWritable(String.prototype.charAt, "name");
+verifyConfigurable(String.prototype.charAt, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/charAt/not-a-constructor.js
new file mode 100644
index 0000000000..6e00163a90
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.charAt does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.charAt),
+  false,
+  'isConstructor(String.prototype.charAt) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.charAt();
+}, '`new String.prototype.charAt()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/pos-coerce-err.js b/js/src/tests/test262/built-ins/String/prototype/charAt/pos-coerce-err.js
new file mode 100644
index 0000000000..a2ea4dac46
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/pos-coerce-err.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charat
+description: Error when attempting to coerce providec "pos" to a Number
+info: |
+  [...]
+  3. Let position be ? ToInteger(pos).
+  [...]
+
+  7.1.4 ToInteger
+
+  1. Let number be ? ToNumber(argument).
+---*/
+
+var noCoerce = Object.create(null);
+
+assert.throws(TypeError, function() {
+  ''.charAt(noCoerce);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/pos-coerce-string.js b/js/src/tests/test262/built-ins/String/prototype/charAt/pos-coerce-string.js
new file mode 100644
index 0000000000..51cdde8314
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/pos-coerce-string.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charat
+description: Coercion of "pos" string value into number
+info: |
+  [...]
+  3. Let position be ? ToInteger(pos).
+  [...]
+
+  7.1.4 ToInteger
+
+  1. Let number be ? ToNumber(argument).
+---*/
+
+assert.sameValue('abcd'.charAt('   +00200.0000E-0002   '), 'c');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/pos-rounding.js b/js/src/tests/test262/built-ins/String/prototype/charAt/pos-rounding.js
new file mode 100644
index 0000000000..0f516f73c5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/pos-rounding.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charat
+description: Rounding of the provided "pos" number
+info: |
+  [...]
+  3. Let position be ? ToInteger(pos).
+  [...]
+
+  7.1.4 ToInteger
+
+  1. Let number be ? ToNumber(argument).
+  2. If number is NaN, return +0.
+  3. If number is +0, -0, +∞, or -∞, return number.
+  4. Return the number value that is the same sign as number and whose
+     magnitude is floor(abs(number)). 
+---*/
+
+assert.sameValue('abc'.charAt(-0.99999), 'a', '-0.99999');
+assert.sameValue('abc'.charAt(-0.00001), 'a', '-0.00001');
+assert.sameValue('abc'.charAt(0.00001), 'a', '0.00001');
+assert.sameValue('abc'.charAt(0.99999), 'a', '0.99999');
+assert.sameValue('abc'.charAt(1.00001), 'b', '1.00001');
+assert.sameValue('abc'.charAt(1.99999), 'b', '1.99999');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/shell.js b/js/src/tests/test262/built-ins/String/prototype/charAt/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/charAt/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/charAt/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..3028c94073
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charAt/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charat
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var charAt = String.prototype.charAt;
+
+assert.sameValue(typeof charAt, 'function');
+
+assert.throws(TypeError, function() {
+  charAt.call(undefined, 0);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  charAt.call(null, 0);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1.1.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1.1.js
new file mode 100644
index 0000000000..9e27b9db34
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1.1.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt() can accept many arguments
+es5id: 15.5.4.5_A1.1
+description: Checking by using eval
+---*/
+
+function __FACTORY() {
+  this.toString = function() {
+    return "wizard";
+  };
+};
+
+__FACTORY.prototype.charCodeAt = String.prototype.charCodeAt;
+
+var __instance = new __FACTORY;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.charCodeAt(eval("1"), true, null, {}) !== 0x69) {
+  throw new Test262Error('#1: __instance.charCodeAt(eval("1"),true,null,{})=== 0x69. Actual: __instance.charCodeAt(eval("1"),true,null,{})===' + __instance.charCodeAt(eval("1"), true, null, {}));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A10.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A10.js
new file mode 100644
index 0000000000..51d18d3db5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.charCodeAt.length property has the attribute ReadOnly
+es5id: 15.5.4.5_A10
+description: >
+    Checking if varying the String.prototype.charCodeAt.length
+    property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.charCodeAt.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.charCodeAt.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.charCodeAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.charCodeAt.length;
+
+verifyNotWritable(String.prototype.charCodeAt, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.charCodeAt.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.charCodeAt.length; String.prototype.charCodeAt.length = function(){return "shifted";}; String.prototype.charCodeAt.length === __obj. Actual: ' + String.prototype.charCodeAt.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A11.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A11.js
new file mode 100644
index 0000000000..104b402726
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the charCodeAt method is 1
+es5id: 15.5.4.5_A11
+description: Checking String.prototype.charCodeAt.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.charCodeAt.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.charCodeAt.hasOwnProperty("length") return true. Actual: ' + String.prototype.charCodeAt.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.charCodeAt.length !== 1) {
+  throw new Test262Error('#2: String.prototype.charCodeAt.length === 1. Actual: ' + String.prototype.charCodeAt.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T1.js
new file mode 100644
index 0000000000..53edc2e24b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T1
+description: pos is false and true, and instance is object
+---*/
+
+var __instance = new Object(42);
+
+__instance.charCodeAt = String.prototype.charCodeAt;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ((__instance.charCodeAt(false) !== 52) || (__instance.charCodeAt(true) !== 50)) {
+  throw new Test262Error('#1: __instance = new Object(42); __instance.charCodeAt = String.prototype.charCodeAt;  __instance.charCodeAt(false) === 52 and __instance.charCodeAt(true) === 50. Actual: __instance.charCodeAt(false) ===' + __instance.charCodeAt(false) + ' and __instance.charCodeAt(true) ===' + __instance.charCodeAt(true));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T10.js
new file mode 100644
index 0000000000..8548781ffe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T10.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T10
+description: Call charCodeAt() function with object argument
+---*/
+
+var __obj = {
+  toString: function() {
+    return 1;
+  }
+}
+var __str = "lego";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.charCodeAt(__obj) !== 0x65) {
+  throw new Test262Error('#1: var __obj = {toString:function(){return 1;}}; var __str = "lego"; __str.charCodeAt(__obj) === 0x65. Actual: ' + __str.charCodeAt(__obj));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T2.js
new file mode 100644
index 0000000000..f93769b079
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T2.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T2
+description: pos is equation with false and true, and instance is Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.charCodeAt = String.prototype.charCodeAt;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.charCodeAt(false) !== 0x66) {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.charCodeAt = String.prototype.charCodeAt; __instance.charCodeAt(false)===0x66. Actual: ' + __instance.charCodeAt(false));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__instance.charCodeAt(true) !== 0x61) {
+  throw new Test262Error('#2: __instance = new Boolean; __instance.charCodeAt = String.prototype.charCodeAt; __instance.charCodeAt(true)===0x61. Actual: ' + __instance.charCodeAt(true));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__instance.charCodeAt(true + 1) !== 0x6C) {
+  throw new Test262Error('#3: __instance = new Boolean; __instance.charCodeAt = String.prototype.charCodeAt; __instance.charCodeAt(true+1) === 0x6C. Actual: ' + __instance.charCodeAt(true + 1));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T4.js
new file mode 100644
index 0000000000..729817fd72
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T4.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T4
+description: Call charCodeAt() function without argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since Number() evaluates to 0 charCodeAt() evaluates to charCodeAt(0)
+if ("smart".charCodeAt() !== 0x73) {
+  throw new Test262Error('#1: "smart".charCodeAt() === 0x73. Actual: "smart".charCodeAt() ===' + ("smart".charCodeAt()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T5.js
new file mode 100644
index 0000000000..c975a03b3a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T5
+description: Call charCodeAt() function with null argument of function object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(null) evaluates to 0 charCodeAt() evaluates to charCodeAt(0)
+if (function() {
+    return "lego"
+  }().charCodeAt(null) !== 0x6C) {
+  throw new Test262Error('#1: function(){return "lego"}().charCodeAt(null) === 0x6C. Actual: ' + function() {
+    return "lego"
+  }().charCodeAt(null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T6.js
new file mode 100644
index 0000000000..f45c701d11
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T6
+description: >
+    Call charCodeAt() function with x argument of new String object,
+    where x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(undefined) evaluates to 0 charCodeAt() evaluates to charCodeAt(0)
+if (new String("lego").charCodeAt(x) !== 0x6C) {
+  throw new Test262Error('#1: var x; new String("lego").charCodeAt(x) === 0x6C. Actual: new String("lego").charCodeAt(x) ===' + new String("lego").charCodeAt(x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T7.js
new file mode 100644
index 0000000000..a7542ca12b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T7
+description: Call charCodeAt() function with undefined argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(undefined) evaluates to 0 charCodeAt() evaluates to charCodeAt(0)
+if (String("lego").charCodeAt(undefined) !== 0x6C) {
+  throw new Test262Error('#1: String("lego").charCodeAt(undefined) === 0x6C. Actual: String("lego").charCodeAt(undefined) ===' + String("lego").charCodeAt(undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T8.js
new file mode 100644
index 0000000000..855cc4213f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T8.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T8
+description: Call charCodeAt() function with void 0 argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(void 0) evaluates to 0 charCodeAt() evaluates to charCodeAt(0)
+if (String(42).charCodeAt(void 0) !== 0x34) {
+  throw new Test262Error('#1: String(42).charCodeAt(void 0) === 0x34. Actual: String(42).charCodeAt(void 0) ===' + String(42).charCodeAt(void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T9.js
new file mode 100644
index 0000000000..fa466e9cac
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A1_T9.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt(pos)
+es5id: 15.5.4.5_A1_T9
+description: >
+    Call charCodeAt() function with function(){}() argument of string
+    object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToInteger(undefined) evaluates to 0 charCodeAt() evaluates to charCodeAt(0)
+if (new String(42).charCodeAt(function() {}()) !== 0x34) {
+  throw new Test262Error('#1: new String(42).charCodeAt(function(){}()) === 0x34. Actual: new String(42).charCodeAt(function(){}()) ===' + new String(42).charCodeAt(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A2.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A2.js
new file mode 100644
index 0000000000..e7e04ab7f9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A2.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    When String.prototype.charCodeAt(pos) calls if ToInteger(pos) less than 0
+    the NaN returns
+es5id: 15.5.4.5_A2
+description: Call charCodeAt(pos) with negative pos
+---*/
+
+function __FACTORY() {};
+
+__FACTORY.prototype.charCodeAt = String.prototype.charCodeAt;
+
+var __instance = new __FACTORY;
+
+assert.sameValue(__instance.charCodeAt(-1), NaN);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A3.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A3.js
new file mode 100644
index 0000000000..5ac83b6a0a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A3.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    When String.prototype.charCodeAt(pos) calls if ToInteger(pos) not less
+    than ToString(this value) the NaN returns
+es5id: 15.5.4.5_A3
+description: pos is bigger of string length
+---*/
+
+var __instance = new String("ABC");
+
+assert.sameValue(__instance.charCodeAt(3), NaN);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A4.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A4.js
new file mode 100644
index 0000000000..3b74114d7f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A4.js
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    When String.prototype.charCodeAt(pos) calls first calls ToString, giving
+    it the this value as its argument
+es5id: 15.5.4.5_A4
+description: Change toString function, it trow exception, and call charCodeAt()
+---*/
+
+var __obj = {
+  valueOf: 1,
+  toString: function() {
+    throw 'intostring'
+  },
+  charCodeAt: String.prototype.charCodeAt
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.charCodeAt();
+  throw new Test262Error('#1:  "var x = __obj.charCodeAt()" lead to throwing exception');
+} catch (e) {
+  if (e !== 'intostring') {
+    throw new Test262Error('#1.1: Exception === \'intostring\'. Actual: exception ===' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A6.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A6.js
new file mode 100644
index 0000000000..b5b9cbef8a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt has not prototype property
+es5id: 15.5.4.5_A6
+description: Checking String.prototype.charCodeAt.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.charCodeAt.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.charCodeAt.prototype === undefined. Actual: ' + String.prototype.charCodeAt.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A7.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A7.js
new file mode 100644
index 0000000000..be97cc320c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.charCodeAt can't be used as constructor
+es5id: 15.5.4.5_A7
+description: Checking if creating the String.prototype.charCodeAt object fails
+---*/
+
+var __FACTORY = String.prototype.charCodeAt;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.charCodeAt; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if (e instanceof Test262Error) throw e;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A8.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A8.js
new file mode 100644
index 0000000000..d62fdb38ba
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.charCodeAt.length property has the attribute DontEnum
+es5id: 15.5.4.5_A8
+description: >
+    Checking if enumerating the String.prototype.charCodeAt.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.charCodeAt.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.charCodeAt.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.charCodeAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.charCodeAt.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.charCodeAt.propertyIsEnumerable(\'length\') return false. Actual: ' + String.prototype.charCodeAt.propertyIsEnumerable('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.charCodeAt) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.charCodeAt){if (p==="length") count++;} count === 0. Actual: count ===' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A9.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A9.js
new file mode 100644
index 0000000000..28876dd07a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/S15.5.4.5_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.charCodeAt.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.5_A9
+description: >
+    Checking if deleting the String.prototype.charCodeAt.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.charCodeAt.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.charCodeAt.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.charCodeAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.charCodeAt.length) {
+  throw new Test262Error('#1: delete String.prototype.charCodeAt.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.charCodeAt.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.charCodeAt.length; String.prototype.charCodeAt.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.charCodeAt.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/browser.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/name.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/name.js
new file mode 100644
index 0000000000..9916d17abf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.2
+description: >
+  String.prototype.charCodeAt.name is "charCodeAt".
+info: |
+  String.prototype.charCodeAt ( pos )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.charCodeAt.name, "charCodeAt");
+
+verifyNotEnumerable(String.prototype.charCodeAt, "name");
+verifyNotWritable(String.prototype.charCodeAt, "name");
+verifyConfigurable(String.prototype.charCodeAt, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/not-a-constructor.js
new file mode 100644
index 0000000000..282fcb0b55
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.charCodeAt does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.charCodeAt),
+  false,
+  'isConstructor(String.prototype.charCodeAt) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.charCodeAt();
+}, '`new String.prototype.charCodeAt()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-coerce-err.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-coerce-err.js
new file mode 100644
index 0000000000..3f30646ab3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-coerce-err.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charcodeat
+description: Error when attempting to coerce providec "pos" to a Number
+info: |
+  [...]
+  3. Let position be ? ToInteger(pos).
+  [...]
+
+  7.1.4 ToInteger
+
+  1. Let number be ? ToNumber(argument).
+---*/
+
+var noCoerce = Object.create(null);
+
+assert.throws(TypeError, function() {
+  ''.charCodeAt(noCoerce);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-coerce-string.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-coerce-string.js
new file mode 100644
index 0000000000..8d41a2de81
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-coerce-string.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charcodeat
+description: Coercion of "pos" string value into number
+info: |
+  [...]
+  3. Let position be ? ToInteger(pos).
+  [...]
+
+  7.1.4 ToInteger
+
+  1. Let number be ? ToNumber(argument).
+---*/
+
+var cCode = 99;
+
+assert.sameValue('abcd'.charCodeAt('   +00200.0000E-0002   '), cCode);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-rounding.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-rounding.js
new file mode 100644
index 0000000000..577d1e1fc8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/pos-rounding.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charcodeat
+description: Rounding of the provided "pos" number
+info: |
+  [...]
+  3. Let position be ? ToInteger(pos).
+  [...]
+
+  7.1.4 ToInteger
+
+  1. Let number be ? ToNumber(argument).
+  2. If number is NaN, return +0.
+  3. If number is +0, -0, +∞, or -∞, return number.
+  4. Return the number value that is the same sign as number and whose
+     magnitude is floor(abs(number)). 
+---*/
+
+var aCode = 97;
+var bCode = 98;
+
+assert.sameValue('abc'.charCodeAt(-0.99999), aCode, '-0.99999');
+assert.sameValue('abc'.charCodeAt(-0.00001), aCode, '-0.00001');
+assert.sameValue('abc'.charCodeAt(0.00001), aCode, '0.00001');
+assert.sameValue('abc'.charCodeAt(0.99999), aCode, '0.99999');
+assert.sameValue('abc'.charCodeAt(1.00001), bCode, '1.00001');
+assert.sameValue('abc'.charCodeAt(1.99999), bCode, '1.99999');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/shell.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/charCodeAt/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..0215b3ba7d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/charCodeAt/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.charcodeat
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var charCodeAt = String.prototype.charCodeAt;
+
+assert.sameValue(typeof charCodeAt, 'function');
+
+assert.throws(TypeError, function() {
+  charCodeAt.call(undefined, 0);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  charCodeAt.call(null, 0);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/browser.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/codePointAt.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/codePointAt.js
new file mode 100644
index 0000000000..1838f1e274
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/codePointAt.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Property type and descriptor.
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.codePointAt,
+  'function',
+  '`typeof String.prototype.codePointAt` is `function`'
+);
+
+verifyNotEnumerable(String.prototype, 'codePointAt');
+verifyWritable(String.prototype, 'codePointAt');
+verifyConfigurable(String.prototype, 'codePointAt');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/length.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/length.js
new file mode 100644
index 0000000000..99acb42698
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/length.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  String.prototype.codePointAt.length value and descriptor.
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.codePointAt.length, 1,
+  'The value of `String.prototype.codePointAt.length` is `1`'
+);
+
+verifyNotEnumerable(String.prototype.codePointAt, 'length');
+verifyNotWritable(String.prototype.codePointAt, 'length');
+verifyConfigurable(String.prototype.codePointAt, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/name.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/name.js
new file mode 100644
index 0000000000..db3ce58ddc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/name.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  String.prototype.codePointAt.name value and descriptor.
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.codePointAt.name, 'codePointAt',
+  'The value of `String.prototype.codePointAt.name` is `"codePointAt"`'
+);
+
+verifyNotEnumerable(String.prototype.codePointAt, 'name');
+verifyNotWritable(String.prototype.codePointAt, 'name');
+verifyConfigurable(String.prototype.codePointAt, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/not-a-constructor.js
new file mode 100644
index 0000000000..56d31f5280
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.codePointAt does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.codePointAt),
+  false,
+  'isConstructor(String.prototype.codePointAt) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.codePointAt();
+}, '`new String.prototype.codePointAt()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-object-pos-to-integer.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-object-pos-to-integer.js
new file mode 100644
index 0000000000..354a5d43c4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-object-pos-to-integer.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Returns abrupt from ToInteger(pos)
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+  4. Let position be ToInteger(pos).
+  5. ReturnIfAbrupt(position).
+---*/
+
+var o = {
+  valueOf: function() {
+    throw new Test262Error();
+  }
+}
+
+assert.throws(Test262Error, function() {
+  'abc'.codePointAt(o);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-symbol-pos-to-integer.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-symbol-pos-to-integer.js
new file mode 100644
index 0000000000..fb59c85a1f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-symbol-pos-to-integer.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Returns abrupt from ToInteger(pos)
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+  4. Let position be ToInteger(pos).
+  5. ReturnIfAbrupt(position).
+features: [Symbol]
+---*/
+
+var s = Symbol(1);
+
+assert.throws(TypeError, function() {
+  'abc'.codePointAt(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-this-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-this-as-symbol.js
new file mode 100644
index 0000000000..ff7613d472
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-this-as-symbol.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Returns abrupt from ToString(this) where this is a Symbol
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+features: [Symbol]
+---*/
+
+var s = Symbol();
+
+assert.throws(TypeError, function() {
+  String.prototype.codePointAt.call(s, 1);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-this.js
new file mode 100644
index 0000000000..c83735ca0f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-abrupt-from-this.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Returns abrupt from ToString(this)
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+---*/
+
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.codePointAt.call(o, 1);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-code-unit-coerced-position.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-code-unit-coerced-position.js
new file mode 100644
index 0000000000..637a6d035d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-code-unit-coerced-position.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Return value on coerced values on ToInteger(position).
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  ...
+  4. Let position be ToInteger(pos).
+  ...
+
+---*/
+
+assert.sameValue('\uD800\uDC00'.codePointAt(''), 65536);
+assert.sameValue('\uD800\uDC00'.codePointAt('0'), 65536);
+assert.sameValue('\uD800\uDC00'.codePointAt(NaN), 65536);
+assert.sameValue('\uD800\uDC00'.codePointAt(false), 65536);
+assert.sameValue('\uD800\uDC00'.codePointAt(null), 65536);
+assert.sameValue('\uD800\uDC00'.codePointAt(undefined), 65536);
+assert.sameValue('\uD800\uDC00'.codePointAt([]), 65536);
+
+assert.sameValue('\uD800\uDC00'.codePointAt('1'), 56320);
+assert.sameValue('\uD800\uDC00'.codePointAt(true), 56320);
+assert.sameValue('\uD800\uDC00'.codePointAt([1]), 56320);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-first-code-unit.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-first-code-unit.js
new file mode 100644
index 0000000000..dba2e3dc85
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-first-code-unit.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Returns code point of LeadSurrogate if not followed by a valid TrailSurrogate.
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  ...
+  8. Let first be the code unit value of the element at index position in the
+  String S.
+  9. If first < 0xD800 or first > 0xDBFF or position+1 = size, return first.
+  10. Let second be the code unit value of the element at index position+1 in
+  the String S.
+  11. If second < 0xDC00 or second > 0xDFFF, return first.
+---*/
+
+assert.sameValue('\uD800\uDBFF'.codePointAt(0), 0xD800);
+assert.sameValue('\uD800\uE000'.codePointAt(0), 0xD800);
+
+assert.sameValue('\uDAAA\uDBFF'.codePointAt(0), 0xDAAA);
+assert.sameValue('\uDAAA\uE000'.codePointAt(0), 0xDAAA);
+
+assert.sameValue('\uDBFF\uDBFF'.codePointAt(0), 0xDBFF);
+assert.sameValue('\uDBFF\uE000'.codePointAt(0), 0xDBFF);
+
+assert.sameValue('\uD800\u0000'.codePointAt(0), 0xD800);
+assert.sameValue('\uD800\uFFFF'.codePointAt(0), 0xD800);
+
+assert.sameValue('\uDAAA\u0000'.codePointAt(0), 0xDAAA);
+assert.sameValue('\uDAAA\uFFFF'.codePointAt(0), 0xDAAA);
+
+assert.sameValue('\uDBFF\uDBFF'.codePointAt(0), 0xDBFF);
+assert.sameValue('\uDBFF\uFFFF'.codePointAt(0), 0xDBFF);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-single-code-unit.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-single-code-unit.js
new file mode 100644
index 0000000000..b37fe8bab0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-single-code-unit.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Return single code unit value of the element at index position.
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+  4. Let position be ToInteger(pos).
+  5. ReturnIfAbrupt(position).
+  6. Let size be the number of elements in S.
+  7. If position < 0 or position ≥ size, return undefined.
+  8. Let first be the code unit value of the element at index position in the
+  String S.
+  9. If first < 0xD800 or first > 0xDBFF or position+1 = size, return first.
+---*/
+
+assert.sameValue('abc'.codePointAt(0), 97);
+assert.sameValue('abc'.codePointAt(1), 98);
+assert.sameValue('abc'.codePointAt(2), 99);
+
+assert.sameValue('\uAAAA\uBBBB'.codePointAt(0), 0xAAAA);
+assert.sameValue('\uD7FF\uAAAA'.codePointAt(0), 0xD7FF);
+assert.sameValue('\uDC00\uAAAA'.codePointAt(0), 0xDC00);
+assert.sameValue('\uAAAA\uBBBB'.codePointAt(0), 0xAAAA);
+
+assert.sameValue('123\uD800'.codePointAt(3), 0xD800);
+assert.sameValue('123\uDAAA'.codePointAt(3), 0xDAAA);
+assert.sameValue('123\uDBFF'.codePointAt(3), 0xDBFF);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-utf16-decode.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-utf16-decode.js
new file mode 100644
index 0000000000..42620b6277
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-utf16-decode.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Return UTF16 Decode value of the lead and trail elements at index position.
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  ...
+  8. Let first be the code unit value of the element at index position in the
+  String S.
+  9. If first < 0xD800 or first > 0xDBFF or position+1 = size, return first.
+  10. Let second be the code unit value of the element at index position+1 in
+  the String S.
+  11. If second < 0xDC00 or second > 0xDFFF, return first.
+  12. Return UTF16Decode(first, second).
+
+  10.1.2 Static Semantics: UTF16Decode( lead, trail )
+
+  Two code units, lead and trail, that form a UTF-16 surrogate pair are
+  converted to a code point by performing the following steps:
+
+  1. Assert: 0xD800 ≤ lead ≤ 0xDBFF and 0xDC00 ≤ trail ≤ 0xDFFF.
+  2. Let cp be (lead – 0xD800) × 1024 + (trail – 0xDC00) + 0x10000.
+  3. Return the code point cp.
+---*/
+
+assert.sameValue('\uD800\uDC00'.codePointAt(0), 65536, 'U+10000');
+assert.sameValue('\uD800\uDDD0'.codePointAt(0), 66000, 'U+101D0');
+assert.sameValue('\uD800\uDFFF'.codePointAt(0), 66559, 'U+103FF');
+
+assert.sameValue('\uDAAA\uDC00'.codePointAt(0), 763904, 'U+BA800');
+assert.sameValue('\uDAAA\uDDD0'.codePointAt(0), 764368, 'U+BA9D0');
+assert.sameValue('\uDAAA\uDFFF'.codePointAt(0), 764927, 'U+BABFF');
+
+assert.sameValue('\uDBFF\uDC00'.codePointAt(0), 1113088, 'U+10FC00');
+assert.sameValue('\uDBFF\uDDD0'.codePointAt(0), 1113552, 'U+10FDD0');
+assert.sameValue('\uDBFF\uDFFF'.codePointAt(0), 1114111, 'U+10FFFF');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/returns-undefined-on-position-equal-or-more-than-size.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/returns-undefined-on-position-equal-or-more-than-size.js
new file mode 100644
index 0000000000..57cf03d817
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/returns-undefined-on-position-equal-or-more-than-size.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  If pos >= size, return undefined
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+  4. Let position be ToInteger(pos).
+  5. ReturnIfAbrupt(position).
+  6. Let size be the number of elements in S.
+  7. If position < 0 or position ≥ size, return undefined.
+---*/
+
+assert.sameValue('abc'.codePointAt(3), undefined);
+assert.sameValue('abc'.codePointAt(4), undefined);
+assert.sameValue('abc'.codePointAt(Infinity), undefined);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/returns-undefined-on-position-less-than-zero.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/returns-undefined-on-position-less-than-zero.js
new file mode 100644
index 0000000000..087909a08e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/returns-undefined-on-position-less-than-zero.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  If pos < size, return undefined
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+  4. Let position be ToInteger(pos).
+  5. ReturnIfAbrupt(position).
+  6. Let size be the number of elements in S.
+  7. If position < 0 or position ≥ size, return undefined.
+---*/
+
+assert.sameValue('abc'.codePointAt(-1), undefined);
+assert.sameValue('abc'.codePointAt(-Infinity), undefined);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/shell.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/this-is-null-throws.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/this-is-null-throws.js
new file mode 100644
index 0000000000..d6a23b7b6a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/this-is-null-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Throws TypeError when `this` is null
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.codePointAt.call(null, 1);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/this-is-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/this-is-undefined-throws.js
new file mode 100644
index 0000000000..edc798df09
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/this-is-undefined-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Throws TypeError when `this` is undefined
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.codePointAt.call(undefined, 1);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A10.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A10.js
new file mode 100644
index 0000000000..c51f6ecdd1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.concat.length property has the attribute ReadOnly
+es5id: 15.5.4.6_A10
+description: >
+    Checking if varying the String.prototype.concat.length property
+    fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.concat.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.concat.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.concat.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.concat.length;
+
+verifyNotWritable(String.prototype.concat, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.concat.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.concat.length; String.prototype.concat.length = function(){return "shifted";}; String.prototype.concat.length === __obj. Actual: ' + String.prototype.concat.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A11.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A11.js
new file mode 100644
index 0000000000..27347f1f1a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the concat method is 1
+es5id: 15.5.4.6_A11
+description: Checking String.prototype.concat.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.concat.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.concat.hasOwnProperty("length") return true. Actual: ' + String.prototype.concat.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.concat.length !== 1) {
+  throw new Test262Error('#2: String.prototype.concat.length === 1. Actual: ' + String.prototype.concat.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T1.js
new file mode 100644
index 0000000000..b1d3528276
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T1
+description: Arguments are false and true, and instance is object
+---*/
+
+var __instance = new Object(42);
+
+__instance.concat = String.prototype.concat;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.concat(false, true) !== "42falsetrue") {
+  throw new Test262Error('#1: __instance = new Object(42); __instance.concat = String.prototype.concat;  __instance.concat(false,true) === "42falsetrue". Actual: ' + __instance.concat(false, true));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T10.js
new file mode 100644
index 0000000000..85b6805c04
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T10.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T10
+description: Call concat([,[...]]) function with object arguments
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041";
+  },
+  valueOf: function() {
+    return "_\u0041_";
+  }
+}
+var __obj2 = {
+  toString: function() {
+    return true;
+  }
+}
+var __obj3 = {
+  toString: function() {
+    return 42;
+  }
+}
+var __str = "lego";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.concat(__obj) !== "legoA") {
+  throw new Test262Error('#1: var x; var __obj = {toString:function(){return "\u0041";}, valueOf:function(){return "_\u0041_";}}; var __str = "lego"; __str.concat(__obj) === "legoA". Actual: ' + __str.concat(__obj));
+}
+if (__str.concat(__obj, __obj2, __obj3, x) !== "legoAtrue42undefined") {
+  throw new Test262Error('#2: var x; var __obj = {toString:function(){return "\u0041";}, valueOf:function(){return "_\u0041_";}}; var __obj2 = {toString:function(){return true;}}; var __obj3 = {toString:function(){return 42;}}; var __str = "lego"; __str.concat(__obj, __obj2, __obj3, x) === "legoAtrue42undefined". Actual: ' + __str.concat(__obj, __obj2, __obj3, x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T2.js
new file mode 100644
index 0000000000..72c9c7d2df
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T2.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T2
+description: >
+    Arguments are equation with false and true, and instance is
+    Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.concat = String.prototype.concat;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.concat("\u0041", true, true + 1) !== "falseAtrue2") {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.concat = String.prototype.concat;  __instance.concat("\\u0041",true,true+1) === "falseAtrue2". Actual: ' + __instance.concat("\u0041", true, true + 1));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T4.js
new file mode 100644
index 0000000000..cbc64804f8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T4.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T4
+description: Call concat([,[...]]) function without argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString() evaluates to "" concat() evaluates to concat("")
+if ("lego".concat() !== "lego") {
+  throw new Test262Error('#1: "lego".concat() === "lego". Actual: ' + ("lego".concat()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T5.js
new file mode 100644
index 0000000000..492f6d8772
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T5.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T5
+description: >
+    Call concat([,[...]]) function with null argument of function
+    object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" concat(null) evaluates to concat("null")
+if (function() {
+    return "lego"
+  }().concat(null) !== "legonull") {
+  throw new Test262Error('#1: function(){return "lego"}().concat(null) === "legonull". Actual: ' + function() {
+    return "lego"
+  }().concat(null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T6.js
new file mode 100644
index 0000000000..ab6cc06c17
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T6
+description: >
+    Call concat([,[...]]) function with x argument of new String
+    object, where x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" concat(undefined) evaluates to concat("undefined")
+if (new String("lego").concat(x) !== "legoundefined") {
+  throw new Test262Error('#1: var x; new String("lego").concat(x) === "legoundefined". Actual: ' + new String("lego").concat(x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T7.js
new file mode 100644
index 0000000000..b3ba0109ad
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T7
+description: >
+    Call concat([,[...]]) function with undefined argument of string
+    object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" concat(undefined) evaluates to concat("undefined")
+if (String("lego").concat(undefined) !== "legoundefined") {
+  throw new Test262Error('#1: String("lego").concat(undefined) === "legoundefined". Actual: ' + String("lego").concat(undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T8.js
new file mode 100644
index 0000000000..7eae3fd440
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T8.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T8
+description: >
+    Call concat([,[...]]) function with void 0 argument of string
+    object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(void 0) evaluates to "undefined" concat(void 0) evaluates to concat("undefined")
+if (String(42).concat(void 0) !== "42undefined") {
+  throw new Test262Error('#1: String(42).concat(void 0) === "42undefined". Actual: ' + String(42).concat(void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T9.js
new file mode 100644
index 0000000000..7a49043e8e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T9.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T9
+description: >
+    Call concat([,[...]]) function with function(){}() argument of
+    string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" concat(undefined) evaluates to concat("undefined")
+if (new String(42).concat(function() {}()) !== "42undefined") {
+  throw new Test262Error('#1: new String(42).concat(function(){}()) === "42undefined". Actual: ' + new String(42).concat(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A2.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A2.js
new file mode 100644
index 0000000000..08f96a9b8c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A2.js
@@ -0,0 +1,31 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]]) can accept at least 128
+es5id: 15.5.4.6_A2
+description: Call concat([,[...]]) function with 128 arguments
+---*/
+
+var __instance = new Number();
+
+__instance.concat = String.prototype.concat;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.concat(
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
+    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF
+  ) !== "001234567891011121314150123456789101112131415012345678910111213141501234567891011121314150123456789101112131415012345678910111213141501234567891011121314150123456789101112131415") {
+  throw new Test262Error('#1: Call concat([,[...]]) function with 128 arguments does not lead to throwing any errors');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A3.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A3.js
new file mode 100644
index 0000000000..91034b8756
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A3.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]]) can't change the instance to be applied
+es5id: 15.5.4.6_A3
+description: Checking if varying the instance that is applied fails
+---*/
+
+var __instance = new String("one");
+
+__instance.concat("two");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance != "one") {
+  throw new Test262Error('#1: __instance = new String("one"); __instance.concat("two");  __instance = new String("one"); __instance.concat("two"); __instance == "one". Actual: ' + __instance);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T1.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T1.js
new file mode 100644
index 0000000000..1cbb6fbcb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T1.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.concat([,[...]]) is called first Call ToString,
+    giving it the this value as its argument
+es5id: 15.5.4.6_A4_T1
+description: Override toString function
+---*/
+
+var __instance = {
+  toString: function() {
+    return "one"
+  }
+};
+
+__instance.concat = String.prototype.concat;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.concat("two", x) !== "onetwoundefined") {
+  throw new Test262Error('#1: var x; __instance = {toString:function(){return "one"}}; __instance.concat = String.prototype.concat;  __instance.concat("two",x) === "onetwoundefined". Actual: ' + __instance.concat("two", x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T2.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T2.js
new file mode 100644
index 0000000000..3a965d4e5a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T2.js
@@ -0,0 +1,40 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.concat([,[...]]) is called first Call ToString,
+    giving it the this value as its argument
+es5id: 15.5.4.6_A4_T2
+description: Override toString function onto function, that throw exception
+---*/
+
+var __instance = {
+  toString: function() {
+    throw "intostring";
+  }
+};
+var __obj = {
+  toString: function() {
+    throw "infirstarg";
+  }
+};
+
+__instance.concat = String.prototype.concat;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  String.prototype.concat.call(__instance, __obj, notexist);
+  throw new Test262Error('#1: "String.prototype.concat.call(__instance,__obj, notexist)" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostring") {
+    throw new Test262Error('#1: e === "intostring". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var notexist;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A6.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A6.js
new file mode 100644
index 0000000000..65fa01265f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat has not prototype property
+es5id: 15.5.4.6_A6
+description: Checking String.prototype.concat.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.concat.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.concat.prototype === undefined. Actual: ' + String.prototype.concat.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A7.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A7.js
new file mode 100644
index 0000000000..05838ed864
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat can't be used as constructor
+es5id: 15.5.4.6_A7
+description: Checking if creating the String.prototype.concat object fails
+---*/
+
+var __FACTORY = String.prototype.concat;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.concat; "__instance = new __FACTORY" lead throwing exception');
+} catch (e) {
+  if (e instanceof Test262Error) throw e;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A8.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A8.js
new file mode 100644
index 0000000000..dee8d4c810
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.concat.length property has the attribute DontEnum
+es5id: 15.5.4.6_A8
+description: >
+    Checking if enumerating the String.prototype.concat.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.concat.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.concat.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.concat.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.concat.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.concat.propertyIsEnumerable(\'length\') return false. Actual: ' + String.prototype.concat.propertyIsEnumerable('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.concat) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count = 0; for (p in String.prototype.concat){ if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A9.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A9.js
new file mode 100644
index 0000000000..16a29b87ae
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.concat.length property does not have the attribute
+    DontDelete
+es5id: 15.5.4.6_A9
+description: >
+    Checking if deleting the String.prototype.concat.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.concat.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.concat.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.concat.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.concat.length) {
+  throw new Test262Error('#1: delete String.prototype.concat.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.concat.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.concat.length; String.prototype.concat.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.concat.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/browser.js b/js/src/tests/test262/built-ins/String/prototype/concat/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/name.js b/js/src/tests/test262/built-ins/String/prototype/concat/name.js
new file mode 100644
index 0000000000..6a4181b098
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.4
+description: >
+  String.prototype.concat.name is "concat".
+info: |
+  String.prototype.concat ( ...args )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.concat.name, "concat");
+
+verifyNotEnumerable(String.prototype.concat, "name");
+verifyNotWritable(String.prototype.concat, "name");
+verifyConfigurable(String.prototype.concat, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/concat/not-a-constructor.js
new file mode 100644
index 0000000000..e0287c912b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.concat does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.concat),
+  false,
+  'isConstructor(String.prototype.concat) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.concat();
+}, '`new String.prototype.concat()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/shell.js b/js/src/tests/test262/built-ins/String/prototype/concat/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/concat/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..eeb652c710
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.concat
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var concat = String.prototype.concat;
+
+assert.sameValue(typeof concat, 'function');
+
+assert.throws(TypeError, function() {
+  concat.call(undefined, '');
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  concat.call(null, '');
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/constructor/S15.5.4.1_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/constructor/S15.5.4.1_A1_T1.js
new file mode 100644
index 0000000000..44d4457ee7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/constructor/S15.5.4.1_A1_T1.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The initial value of String.prototype.constructor is the built-in String
+    constructor
+es5id: 15.5.4.1_A1_T1
+description: Checking String.prototype.constructor
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.constructor !== String) {
+  throw new Test262Error('#1: String.prototype.constructor === String. Actual: String.prototype.constructor ===' + String.prototype.constructor);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/constructor/S15.5.4.1_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/constructor/S15.5.4.1_A1_T2.js
new file mode 100644
index 0000000000..9db613da7f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/constructor/S15.5.4.1_A1_T2.js
@@ -0,0 +1,52 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The initial value of String.prototype.constructor is the built-in String
+    constructor
+es5id: 15.5.4.1_A1_T2
+description: Create new String.prototype.constructor object and check it
+---*/
+
+var __constr = String.prototype.constructor;
+
+var __instance = new __constr("choosing one");
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#0
+if (__instance != "choosing one") {
+  throw new Test262Error('#0: __constr = String.prototype.constructor; __instance = new __constr("choosing one"); __instance =="choosing one". Actual: __instance ==' + __instance);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (__instance.constructor !== String) {
+  throw new Test262Error('#1: __constr = String.prototype.constructor; __instance = new __constr("choosing one"); __instance.constructor === String. Actual: __instance.constructor ===' + __instance.constructor);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+if (!(String.prototype.isPrototypeOf(__instance))) {
+  throw new Test262Error('#2: __constr = String.prototype.constructor; __instance = new __constr("choosing one"); String.prototype.isPrototypeOf(__instance) return true. Actual: ' + String.prototype.isPrototypeOf(__instance));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#3
+var __to_string_result = '[object ' + 'String' + ']';
+
+delete String.prototype.toString;
+
+if (__instance.toString() !== __to_string_result) {
+  throw new Test262Error('#3: __constr = String.prototype.constructor; __instance = new __constr("choosing one"); delete String.prototype.toString; __instance.toString() === __to_string_result. Actual: __instance.toString() ===' + __instance.toString() + ' __to_string_result ===' + __to_string_result);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/constructor/browser.js b/js/src/tests/test262/built-ins/String/prototype/constructor/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/constructor/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/constructor/shell.js b/js/src/tests/test262/built-ins/String/prototype/constructor/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/constructor/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail.js
new file mode 100644
index 0000000000..6c130e2297
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail.js
@@ -0,0 +1,12 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: endsWith should return false when called on 'word' and passed 'r'.
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue('word'.endsWith('r'), false, '"word".endsWith("r")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail_2.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail_2.js
new file mode 100644
index 0000000000..18e2ddd4e6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Fail_2.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    endsWith should return false when called on 'word' and passed 'd',
+    with an endPosition of 3.
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue('word'.endsWith('d', 3), false, '"word".endsWith("d", 3)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success.js
new file mode 100644
index 0000000000..1d58e3a9fd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    endsWith should return true when called on 'word' and passed 'd'
+    and with no endPosition (defaults to 4).
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue('word'.endsWith('d'), true, '"word".endsWith("d")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_2.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_2.js
new file mode 100644
index 0000000000..03b97f024e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_2.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    endsWith should return true when called on 'word' and passed 'd'
+    and with an endPosition of 4.
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue('word'.endsWith('d', 4), true, '"word".endsWith("d", 4)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_3.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_3.js
new file mode 100644
index 0000000000..9d2a03a672
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_3.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    endsWith should return true when called on 'word' and passed 'd'
+    and with an endPosition of 25.
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue('word'.endsWith('d', 25), true, '"word".endsWith("d", 25)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_4.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_4.js
new file mode 100644
index 0000000000..19956fc76d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/String.prototype.endsWith_Success_4.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    endsWith should return true when called on 'word' and passed 'r',
+    with an endPosition of 3.
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue('word'.endsWith('r', 3), true, '"word".endsWith("r", 3)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/browser.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/coerced-values-of-position.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/coerced-values-of-position.js
new file mode 100644
index 0000000000..5b8ce9acd7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/coerced-values-of-position.js
@@ -0,0 +1,39 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns based on coerced values of endPosition.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  12. Let end be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. Let start be end - searchLength.
+  15. If start is less than 0, return false.
+  16. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  17. Otherwise, return false.
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var str = 'The future is cool!';
+
+assert(str.endsWith('', NaN), 'NaN coerced to 0');
+assert(str.endsWith('', null), 'null coerced to 0');
+assert(str.endsWith('', false), 'false coerced to 0');
+assert(str.endsWith('', ''), '"" coerced to 0');
+assert(str.endsWith('', '0'), '"0" coerced to 0');
+assert(str.endsWith('', undefined), 'undefined coerced to 0');
+
+assert(str.endsWith('The future', 10.4), '10.4 coerced to 10');
+assert(str.endsWith('T', true), 'true coerced to 1');
+
+assert(str.endsWith('The future', '10'), '"10" coerced to 10');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/endsWith.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/endsWith.js
new file mode 100644
index 0000000000..e33b121a23
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/endsWith.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Property type and descriptor.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.endsWith,
+  'function',
+  '`typeof String.prototype.endsWith` is `function`'
+);
+
+verifyNotEnumerable(String.prototype, 'endsWith');
+verifyWritable(String.prototype, 'endsWith');
+verifyConfigurable(String.prototype, 'endsWith');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/length.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/length.js
new file mode 100644
index 0000000000..d5040bab96
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/length.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  String.prototype.endsWith.length value and descriptor.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  The length property of the endsWith method is 1.
+
+includes: [propertyHelper.js]
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue(
+  String.prototype.endsWith.length, 1,
+  'The value of `String.prototype.endsWith.length` is `1`'
+);
+
+verifyNotEnumerable(String.prototype.endsWith, 'length');
+verifyNotWritable(String.prototype.endsWith, 'length');
+verifyConfigurable(String.prototype.endsWith, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/name.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/name.js
new file mode 100644
index 0000000000..d4aa6ee5f5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/name.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  String.prototype.endsWith.name value and descriptor.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue(
+  String.prototype.endsWith.name, 'endsWith',
+  'The value of `String.prototype.endsWith.name` is `"endsWith"`'
+);
+
+verifyNotEnumerable(String.prototype.endsWith, 'name');
+verifyNotWritable(String.prototype.endsWith, 'name');
+verifyConfigurable(String.prototype.endsWith, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/not-a-constructor.js
new file mode 100644
index 0000000000..2112ea842d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.endsWith does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, String.prototype.endsWith, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.endsWith),
+  false,
+  'isConstructor(String.prototype.endsWith) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.endsWith();
+}, '`new String.prototype.endsWith()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-position-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-position-as-symbol.js
new file mode 100644
index 0000000000..6c035f420e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-position-as-symbol.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns abrupt from ToInteger(endPosition) as a Symbol.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  ...
+features: [Symbol, String.prototype.endsWith]
+---*/
+
+var position = Symbol();
+
+assert.throws(TypeError, function() {
+  ''.endsWith('', position);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-position.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-position.js
new file mode 100644
index 0000000000..86c26233a1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-position.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns abrupt from ToInteger(endPosition).
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var position = {
+  valueOf: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.endsWith('', position);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring-as-symbol.js
new file mode 100644
index 0000000000..33e6cf455a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring-as-symbol.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns abrupt from ToString(searchString) as a Symbol
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  7. Let searchStr be ToString(searchString).
+  8. ReturnIfAbrupt(searchStr).
+  ...
+features: [Symbol, String.prototype.endsWith]
+---*/
+
+var s = Symbol();
+
+assert.throws(TypeError, function() {
+  ''.endsWith(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring-regexp-test.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring-regexp-test.js
new file mode 100644
index 0000000000..165b14f6f1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring-regexp-test.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns abrupt from IsRegExp(searchString).
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  4. Let isRegExp be IsRegExp(searchString).
+  5. ReturnIfAbrupt(isRegExp).
+  ...
+
+  7.2.8 IsRegExp ( argument )
+
+  2. Let isRegExp be Get(argument, @@match).
+  3. ReturnIfAbrupt(isRegExp).
+features: [Symbol.match, String.prototype.endsWith]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, Symbol.match, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.endsWith(obj);
+});
+
+var regexp = /./;
+Object.defineProperty(regexp, Symbol.match, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.endsWith(regexp);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring.js
new file mode 100644
index 0000000000..915803e6b6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-searchstring.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns abrupt from ToString(searchString)
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  7. Let searchStr be ToString(searchString).
+  8. ReturnIfAbrupt(searchStr).
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var obj = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.endsWith(obj);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-this-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-this-as-symbol.js
new file mode 100644
index 0000000000..8930406092
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-this-as-symbol.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns abrupt from ToString(this) where this is a Symbol
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+  ...
+features: [Symbol, String.prototype.endsWith]
+---*/
+
+var s = Symbol('');
+
+assert.throws(TypeError, function() {
+  String.prototype.endsWith.call(s, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-this.js
new file mode 100644
index 0000000000..5ad458c006
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-abrupt-from-this.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns abrupt from ToString(this)
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+features: [String.prototype.endsWith]
+---*/
+
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.endsWith.call(o, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-false-if-search-start-is-less-than-zero.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-false-if-search-start-is-less-than-zero.js
new file mode 100644
index 0000000000..37ec778399
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-false-if-search-start-is-less-than-zero.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns false if search start is less than 0.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  9. Let len be the number of elements in S.
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  12. Let end be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. Let start be end - searchLength.
+  15. If start is less than 0, return false.
+  ...
+
+  Note: (min(max(pos, 0), len) - searchString.length) < 0;
+features: [String.prototype.endsWith]
+---*/
+
+assert.sameValue(
+  'web'.endsWith('w', 0), false,
+  '"web".endsWith("w", 0) returns false'
+);
+
+assert.sameValue(
+  'Bob'.endsWith('  Bob'), false,
+  '"Bob".endsWith("  Bob") returns false'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/return-true-if-searchstring-is-empty.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-true-if-searchstring-is-empty.js
new file mode 100644
index 0000000000..1871492039
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/return-true-if-searchstring-is-empty.js
@@ -0,0 +1,51 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns true if searchString.length == 0.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  12. Let end be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. Let start be end - searchLength.
+  15. If start is less than 0, return false.
+  16. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var str = 'The future is cool!';
+
+assert(
+  str.endsWith(''),
+  'str.endsWith("") returns true'
+);
+
+assert(
+  str.endsWith('', str.length),
+  'str.endsWith("", str.length) returns true'
+);
+
+assert(
+  str.endsWith('', Infinity),
+  'str.endsWith("", Infinity) returns true'
+);
+
+assert(
+  str.endsWith('', -1),
+  'str.endsWith("", -1) returns true'
+);
+
+assert(
+  str.endsWith('', -Infinity),
+  'str.endsWith("", -Infinity) returns true'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-found-with-position.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-found-with-position.js
new file mode 100644
index 0000000000..0c0445e1fe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-found-with-position.js
@@ -0,0 +1,40 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns true if searchString appears as a substring of the given string with a
+  given position.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  12. Let end be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. Let start be end - searchLength.
+  15. If start is less than 0, return false.
+  16. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var str = 'The future is cool!';
+
+assert(
+  str.endsWith('The future', 10),
+  'str.endsWith("The future", 10) === true'
+);
+assert(
+  str.endsWith('future', 10),
+  'str.endsWith("future", 10) === true'
+);
+assert(
+  str.endsWith(' is cool!', str.length),
+  'str.endsWith(" is cool!", str.length) === true'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-found-without-position.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-found-without-position.js
new file mode 100644
index 0000000000..3eabfafb4d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-found-without-position.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns true if searchString appears as a substring of the given string.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  12. Let end be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. Let start be end - searchLength.
+  15. If start is less than 0, return false.
+  16. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var str = 'The future is cool!';
+
+assert(str.endsWith('cool!'), 'str.endsWith("cool!") === true');
+assert(str.endsWith('!'), 'str.endsWith("!") === true');
+assert(str.endsWith(str), 'str.endsWith(str) === true');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-is-regexp-throws.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-is-regexp-throws.js
new file mode 100644
index 0000000000..8cdf821300
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-is-regexp-throws.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Throws a TypeError if searchString is a RegExp.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  4. Let isRegExp be IsRegExp(searchString).
+  5. ReturnIfAbrupt(isRegExp).
+  6. If isRegExp is true, throw a TypeError exception.
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var searchString = /./;
+
+assert.throws(TypeError, function() {
+  ''.endsWith(searchString);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-not-found-with-position.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-not-found-with-position.js
new file mode 100644
index 0000000000..cf7bb58854
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-not-found-with-position.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns false if searchString is not found with a given position.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  12. Let end be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. Let start be end - searchLength.
+  15. If start is less than 0, return false.
+  16. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  17. Otherwise, return false.
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.endsWith('is cool!', str.length - 1), false,
+  'str.endsWith("is cool!", str.length - 1) === false'
+);
+
+assert.sameValue(
+  str.endsWith('!', 1), false,
+  'str.endsWith("!", 1) === false'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-not-found-without-position.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-not-found-without-position.js
new file mode 100644
index 0000000000..58e6f1f63a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/searchstring-not-found-without-position.js
@@ -0,0 +1,40 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Returns false if searchString is not found.
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  ...
+  10. If endPosition is undefined, let pos be len, else let pos be
+  ToInteger(endPosition).
+  11. ReturnIfAbrupt(pos).
+  12. Let end be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. Let start be end - searchLength.
+  15. If start is less than 0, return false.
+  16. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  17. Otherwise, return false.
+  ...
+features: [String.prototype.endsWith]
+---*/
+
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.endsWith('is Flash!'), false,
+  'str.endsWith("is Flash!") === false'
+);
+assert.sameValue(
+  str.endsWith('IS COOL!'), false,
+  'endsWith is case sensitive'
+);
+assert.sameValue(
+  str.endsWith('The future'), false,
+  'str.endsWith("The future") === false'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/shell.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/this-is-null-throws.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/this-is-null-throws.js
new file mode 100644
index 0000000000..7828dd9e71
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/this-is-null-throws.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Throws TypeError when `this` is null
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+features: [String.prototype.endsWith]
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.endsWith.call(null, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/endsWith/this-is-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/endsWith/this-is-undefined-throws.js
new file mode 100644
index 0000000000..f0b95cd90a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/endsWith/this-is-undefined-throws.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.6
+description: >
+  Throws TypeError when `this` is undefined
+info: |
+  21.1.3.6 String.prototype.endsWith ( searchString [ , endPosition] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+features: [String.prototype.endsWith]
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.endsWith.call(undefined, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailBadLocation.js b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailBadLocation.js
new file mode 100644
index 0000000000..73876d5392
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailBadLocation.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    String should return false if a location is passed that is
+    greather than the length of the string.
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue('word'.includes('w', 5), false, '"word".includes("w", 5)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailLocation.js b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailLocation.js
new file mode 100644
index 0000000000..e8415f3e1e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailLocation.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    String should return false if a letter is not found in the word
+    starting from the passed location.
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue('word'.includes('o', 3), false, '"word".includes("o", 3)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailMissingLetter.js b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailMissingLetter.js
new file mode 100644
index 0000000000..c9eb1245a7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_FailMissingLetter.js
@@ -0,0 +1,12 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: String should return false if a letter is not found in the word.
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue('word'.includes('a', 0), false, '"word".includes("a", 0)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_Success.js b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_Success.js
new file mode 100644
index 0000000000..1651d00988
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_Success.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    String should return true when called on 'word' and passed 'w' and
+    the location 0.
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue('word'.includes('w', 0), true, '"word".includes("w", 0)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_SuccessNoLocation.js b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_SuccessNoLocation.js
new file mode 100644
index 0000000000..49551f6ab7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_SuccessNoLocation.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: >
+    String should return true when called on 'word' and passed 'w' and
+    with no location (defaults to 0).
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue('word'.includes('w'), true, '"word".includes("w")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_lengthProp.js b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_lengthProp.js
new file mode 100644
index 0000000000..b268186511
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/String.prototype.includes_lengthProp.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2014 Ryan Lewis. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ryan Lewis
+description: String should have the property length with size of 1.
+features: [String.prototype.includes]
+---*/
+assert.sameValue('word'.includes.length, 1, '"word".includes.length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/browser.js b/js/src/tests/test262/built-ins/String/prototype/includes/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/coerced-values-of-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/coerced-values-of-position.js
new file mode 100644
index 0000000000..5976cde337
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/coerced-values-of-position.js
@@ -0,0 +1,42 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns based on coerced values of position.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  9. Let pos be ToInteger(position). (If position is undefined, this step
+  produces the value 0).
+  10. ReturnIfAbrupt(pos).
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+
+var str = 'The future is cool!';
+
+assert(str.includes('The future', NaN), 'NaN coerced to 0');
+assert(str.includes('The future', null), 'null coerced to 0');
+assert(str.includes('The future', false), 'false coerced to 0');
+assert(str.includes('The future', ''), '"" coerced to 0');
+assert(str.includes('The future', '0'), '"0" coerced to 0');
+assert(str.includes('The future', undefined), 'undefined coerced to 0');
+assert(str.includes('The future', 0.4), '0.4 coerced to 0');
+
+assert(str.includes('The future', -1));
+
+assert.sameValue(str.includes('The future', true), false, 'true coerced to 1');
+assert.sameValue(str.includes('The future', '1'), false, '"1" coerced to 1');
+assert.sameValue(str.includes('The future', 1.4), false, '1.4 coerced to 1');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/includes.js b/js/src/tests/test262/built-ins/String/prototype/includes/includes.js
new file mode 100644
index 0000000000..e155f7effa
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/includes.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Property type and descriptor.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.includes,
+  'function',
+  '`typeof String.prototype.includes` is `function`'
+);
+
+verifyNotEnumerable(String.prototype, 'includes');
+verifyWritable(String.prototype, 'includes');
+verifyConfigurable(String.prototype, 'includes');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/length.js b/js/src/tests/test262/built-ins/String/prototype/includes/length.js
new file mode 100644
index 0000000000..c74ad3f706
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/length.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  String.prototype.includes.length value and descriptor.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue(
+  String.prototype.includes.length, 1,
+  'The value of `String.prototype.includes.length` is `1`'
+);
+
+verifyNotEnumerable(String.prototype.includes, 'length');
+verifyNotWritable(String.prototype.includes, 'length');
+verifyConfigurable(String.prototype.includes, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/name.js b/js/src/tests/test262/built-ins/String/prototype/includes/name.js
new file mode 100644
index 0000000000..24bf088db4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/name.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  String.prototype.includes.name value and descriptor.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.includes]
+---*/
+
+assert.sameValue(
+  String.prototype.includes.name, 'includes',
+  'The value of `String.prototype.includes.name` is `"includes"`'
+);
+
+verifyNotEnumerable(String.prototype.includes, 'name');
+verifyNotWritable(String.prototype.includes, 'name');
+verifyConfigurable(String.prototype.includes, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/includes/not-a-constructor.js
new file mode 100644
index 0000000000..f276a53f92
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.includes does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.includes),
+  false,
+  'isConstructor(String.prototype.includes) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.includes(1);
+}, '`new String.prototype.includes(1)` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-position-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-position-as-symbol.js
new file mode 100644
index 0000000000..9b54287580
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-position-as-symbol.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns abrupt from ToInteger(position) as a Symbol.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  9. Let pos be ToInteger(position). (If position is undefined, this step
+  produces the value 0).
+  10. ReturnIfAbrupt(pos).
+  ...
+features: [Symbol, String.prototype.includes]
+---*/
+
+var position = Symbol();
+
+assert.throws(TypeError, function() {
+  ''.includes('', position);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-position.js
new file mode 100644
index 0000000000..440bcec201
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-position.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns abrupt from ToInteger(position).
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  9. Let pos be ToInteger(position). (If position is undefined, this step
+  produces the value 0).
+  10. ReturnIfAbrupt(pos).
+  ...
+features: [String.prototype.includes]
+---*/
+
+var position = {
+  valueOf: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.includes('', position);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring-as-symbol.js
new file mode 100644
index 0000000000..6aa47b08ba
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring-as-symbol.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns abrupt from ToString(searchString) as a Symbol
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  7. Let searchStr be ToString(searchString).
+  8. ReturnIfAbrupt(searchStr).
+  ...
+features: [Symbol, String.prototype.includes]
+---*/
+
+var s = Symbol();
+
+assert.throws(TypeError, function() {
+  ''.includes(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring-regexp-test.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring-regexp-test.js
new file mode 100644
index 0000000000..3b6f379e93
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring-regexp-test.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns abrupt from IsRegExp(searchString).
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  4. Let isRegExp be IsRegExp(searchString).
+  5. ReturnIfAbrupt(isRegExp).
+  ...
+
+  7.2.8 IsRegExp ( argument )
+
+  2. Let isRegExp be Get(argument, @@match).
+  3. ReturnIfAbrupt(isRegExp).
+features: [Symbol.match, String.prototype.includes]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, Symbol.match, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.includes(obj);
+});
+
+var regexp = /./;
+Object.defineProperty(regexp, Symbol.match, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.includes(regexp);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring.js
new file mode 100644
index 0000000000..dbab997afc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-searchstring.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns abrupt from ToString(searchString)
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  7. Let searchStr be ToString(searchString).
+  8. ReturnIfAbrupt(searchStr).
+  ...
+features: [String.prototype.includes]
+---*/
+
+var obj = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.includes(obj);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-this-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-this-as-symbol.js
new file mode 100644
index 0000000000..af8905d962
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-this-as-symbol.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns abrupt from ToString(this) where this is a Symbol
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+features: [Symbol, String.prototype.includes]
+---*/
+
+var s = Symbol('');
+
+assert.throws(TypeError, function() {
+  String.prototype.includes.call(s, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-this.js
new file mode 100644
index 0000000000..d811e7e12e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-abrupt-from-this.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns abrupt from ToString(this)
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+features: [String.prototype.includes]
+---*/
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.includes.call(o, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-false-with-out-of-bounds-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-false-with-out-of-bounds-position.js
new file mode 100644
index 0000000000..fda6edafc7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-false-with-out-of-bounds-position.js
@@ -0,0 +1,45 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns false if position is >= this.length and searchString.length > 0.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.includes('!', str.length + 1), false,
+  'str.includes("!", str.length + 1) returns false'
+);
+
+assert.sameValue(
+  str.includes('!', 100), false,
+  'str.includes("!", 100) returns false'
+);
+
+assert.sameValue(
+  str.includes('!', Infinity), false,
+  'str.includes("!", Infinity) returns false'
+);
+
+assert.sameValue(
+  str.includes('!', str.length), false,
+  'str.includes("!", str.length) returns false'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/return-true-if-searchstring-is-empty.js b/js/src/tests/test262/built-ins/String/prototype/includes/return-true-if-searchstring-is-empty.js
new file mode 100644
index 0000000000..dfeaa58403
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/return-true-if-searchstring-is-empty.js
@@ -0,0 +1,40 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns true if searchString.length == 0.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+
+var str = 'The future is cool!';
+
+assert(
+  str.includes('', str.length),
+  'str.includes("", str.length) returns true'
+);
+
+assert(
+  str.includes(''),
+  'str.includes("") returns true'
+);
+
+assert(
+  str.includes('', Infinity),
+  'str.includes("", Infinity) returns true'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-found-with-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-found-with-position.js
new file mode 100644
index 0000000000..26907b4bd4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-found-with-position.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns true if searchString appears as a substring of the given string with a
+  given position.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+
+var str = 'The future is cool!';
+
+assert(
+  str.includes('The future', 0),
+  'Returns true for str.includes("The future", 0)'
+);
+assert(str.includes(' is ', 1), 'Returns true for str.includes(" is ", 1)');
+assert(str.includes('cool!', 10), 'Returns true for str.includes("cool!", 10)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-found-without-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-found-without-position.js
new file mode 100644
index 0000000000..11d9d92d8b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-found-without-position.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns true if searchString appears as a substring of the given string.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+
+var str = 'The future is cool!';
+
+assert(
+  str.includes('The future'),
+  'Returns true for str.includes("The future")'
+);
+assert(str.includes('is cool!'), 'Returns true for str.includes("is cool!")');
+assert(str.includes(str), 'Returns true for str.includes(str)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-is-regexp-throws.js b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-is-regexp-throws.js
new file mode 100644
index 0000000000..3006a4956a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-is-regexp-throws.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Throws a TypeError if searchString is a RegExp.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  4. Let isRegExp be IsRegExp(searchString).
+  5. ReturnIfAbrupt(isRegExp).
+  6. If isRegExp is true, throw a TypeError exception.
+  ...
+features: [String.prototype.includes]
+---*/
+var searchString = /./;
+
+assert.throws(TypeError, function() {
+  ''.includes(searchString);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-not-found-with-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-not-found-with-position.js
new file mode 100644
index 0000000000..cf126204eb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-not-found-with-position.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns false if searchString is not found with a given position.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.includes('The future', 1), false,
+  'Returns false on str.includes("The future", 1)'
+);
+
+assert.sameValue(
+  str.includes(str, 1), false,
+  'Returns false on str.includes(str, 1)'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-not-found-without-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-not-found-without-position.js
new file mode 100644
index 0000000000..3888d0eb96
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/searchstring-not-found-without-position.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns false if searchString is not found.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.includes('Flash'), false,
+  'Flash if not included'
+);
+assert.sameValue(str.includes('FUTURE'), false, 'includes is case sensitive');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/shell.js b/js/src/tests/test262/built-ins/String/prototype/includes/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/this-is-null-throws.js b/js/src/tests/test262/built-ins/String/prototype/includes/this-is-null-throws.js
new file mode 100644
index 0000000000..4bdee98384
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/this-is-null-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Throws TypeError when `this` is null
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+features: [String.prototype.includes]
+---*/
+assert.throws(TypeError, function() {
+  String.prototype.includes.call(null, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/this-is-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/includes/this-is-undefined-throws.js
new file mode 100644
index 0000000000..230cb1cdb5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/this-is-undefined-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Throws TypeError when `this` is undefined
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+features: [String.prototype.includes]
+---*/
+assert.throws(TypeError, function() {
+  String.prototype.includes.call(undefined, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A10.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A10.js
new file mode 100644
index 0000000000..e8470aa105
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.indexOf.length property has the attribute ReadOnly
+es5id: 15.5.4.7_A10
+description: >
+    Checking if varying the String.prototype.indexOf.length property
+    fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.indexOf.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.indexOf.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.indexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.indexOf.length;
+
+verifyNotWritable(String.prototype.indexOf, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.indexOf.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.indexOf.length; String.prototype.indexOf.length = function(){return "shifted";}; String.prototype.indexOf.length === __obj. Actual: ' + String.prototype.indexOf.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A11.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A11.js
new file mode 100644
index 0000000000..9154c4ee74
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the indexOf method is 1
+es5id: 15.5.4.7_A11
+description: Checking String.prototype.indexOf.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.indexOf.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.indexOf.hasOwnProperty("length") return true. Actual: ' + String.prototype.indexOf.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.indexOf.length !== 1) {
+  throw new Test262Error('#2: String.prototype.indexOf.length === 1. Actual: ' + String.prototype.indexOf.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T1.js
new file mode 100644
index 0000000000..5e5f2b4e77
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T1
+description: Arguments are false and true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.indexOf = String.prototype.indexOf;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.indexOf(true, false) !== 0) {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.indexOf = String.prototype.indexOf;  __instance.indexOf(true, false) === 0. Actual: ' + __instance.indexOf(true, false));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T10.js
new file mode 100644
index 0000000000..7a4a6940ad
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T10.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T10
+description: Call indexOf(searchString, position) function with object arguments
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return true;
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.indexOf(__obj, __obj2) !== 3) {
+  throw new Test262Error('#1: var x; var __obj = {toString:function(){return "\u0041B";}}; var __obj2 = {valueOf:function(){return true;}}; var __str = "ABB\u0041BABAB"; __str.indexOf(__obj, __obj2) === 3. Actual: ' + __str.indexOf(__obj, __obj2));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T12.js
new file mode 100644
index 0000000000..ae01758ac0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T12.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T12
+description: Argument is string, and instance is array of strings
+---*/
+
+var __instance = new Array('new', 'zoo', 'revue');
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.indexOf('new') !== 0) {
+  throw new Test262Error('#1: __instance = new Array(\'new\',\'zoo\',\'revue\'); __instance.indexOf(\'new\') === 0. Actual: ' + __instance.indexOf('new'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__instance.indexOf('zoo') !== 1) {
+  throw new Test262Error('#2: __instance = new Array(\'new\',\'zoo\',\'revue\'); __instance.indexOf(\'zoo\') === 1. Actual: ' + __instance.indexOf('zoo'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T2.js
new file mode 100644
index 0000000000..84559cf6bf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T2.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T2
+description: >
+    Arguments are boolean equation, function and null, and instance is
+    Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.indexOf = String.prototype.indexOf;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.indexOf("A" !== "\u0041", function() {
+    return 0;
+  }(), null) !== 0) {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.indexOf = String.prototype.indexOf;  __instance.indexOf("A"!=="\\u0041", function(){return 0;}(),null) === 0. Actual: ' + __instance.indexOf("A" !== "\u0041", function() {
+    return 0;
+  }(), null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T4.js
new file mode 100644
index 0000000000..f569552206
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T4.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T4
+description: >
+    Call indexOf(searchString, position) function without arguments of
+    string
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString() evaluates to "" indexOf() evaluates to indexOf("",0)
+if ("".indexOf() !== -1) {
+  throw new Test262Error('#1: "".indexOf() === -1. Actual: ' + ("".indexOf()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T5.js
new file mode 100644
index 0000000000..062eb4a5bf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T5.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T5
+description: >
+    Call indexOf(searchString, position) function with null argument
+    of function object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" indexOf(null) evaluates to indexOf("",0)
+if (function() {
+    return "gnulluna"
+  }().indexOf(null) !== 1) {
+  throw new Test262Error('#1: function(){return "gnulluna"}().indexOf(null) === 1. Actual: ' + function() {
+    return "gnulluna"
+  }().indexOf(null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T6.js
new file mode 100644
index 0000000000..220003e0b7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T6
+description: >
+    Call indexOf(searchString, position) function with x argument of
+    new String object, where x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "" indexOf(undefined) evaluates to indexOf("",0)
+if (new String("undefined").indexOf(x) !== 0) {
+  throw new Test262Error('#1: var x; new String("undefined").indexOf(x) === 0. Actual: ' + new String("undefined").indexOf(x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T7.js
new file mode 100644
index 0000000000..7a617eff3a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T7
+description: >
+    Call indexOf(searchString, position) function with undefined
+    argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" indexOf(undefined) evaluates to indexOf("undefined",0)
+if (String("undefined").indexOf(undefined) !== 0) {
+  throw new Test262Error('#1: String("undefined").indexOf(undefined) === 0. Actual: ' + String("undefined").indexOf(undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T8.js
new file mode 100644
index 0000000000..ecc0cfb088
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T8.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T8
+description: >
+    Call indexOf(searchString, position) function with void 0 argument
+    of string object
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(void 0) evaluates to "undefined" indexOf(void 0) evaluates to indexOf("undefined")
+if (String(__obj).indexOf(void 0) !== 0) {
+  throw new Test262Error('#1: __obj = {toString:function(){}}; String(__obj).indexOf(void 0) === 0. Actual: ' + String(__obj).indexOf(void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T9.js
new file mode 100644
index 0000000000..e21a055b41
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A1_T9.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf(searchString, position)
+es5id: 15.5.4.7_A1_T9
+description: >
+    Call indexOf(searchString, position) function with function(){}()
+    argument of string object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" indexOf(undefined) evaluates to indexOf("undefined")
+if (new String(__obj).indexOf(function() {}()) !== 0) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; new String(__obj).indexOf(function(){}()) === 0. Actual: ' + new String(__obj).indexOf(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T1.js
new file mode 100644
index 0000000000..e338160a18
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T1.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: When length of searchString less than length of ToString(this) -1 returns
+es5id: 15.5.4.7_A2_T1
+description: Call "abcd".indexOf("abcdab") and check result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("abcd".indexOf("abcdab") !== -1) {
+  throw new Test262Error('#1: "abcd".indexOf("abcdab")===-1. Actual: ' + ("abcd".indexOf("abcdab")));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T2.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T2.js
new file mode 100644
index 0000000000..ad29d78703
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T2.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: When length of searchString less than length of ToString(this) -1 returns
+es5id: 15.5.4.7_A2_T2
+description: Call "abcd".indexOf("abcdab",0) and check result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("abcd".indexOf("abcdab", 0) !== -1) {
+  throw new Test262Error('#1: "abcd".indexOf("abcdab",0)===-1. Actual: ' + ("abcd".indexOf("abcdab", 0)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T3.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T3.js
new file mode 100644
index 0000000000..0c21d307ce
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T3.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: When length of searchString less than length of ToString(this) -1 returns
+es5id: 15.5.4.7_A2_T3
+description: Call "abcd".indexOf("abcdab",99) and check result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("abcd".indexOf("abcdab", 99) !== -1) {
+  throw new Test262Error('#1: "abcd".indexOf("abcdab",99)===-1. Actual: ' + ("abcd".indexOf("abcdab", 99)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T4.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T4.js
new file mode 100644
index 0000000000..8f9b2be63a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A2_T4.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: When length of searchString less than length of ToString(this) -1 returns
+es5id: 15.5.4.7_A2_T4
+description: Call "abcd".indexOf("abcdab",NaN) and check result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("abcd".indexOf("abcdab", NaN) !== -1) {
+  throw new Test262Error('#1: "abcd".indexOf("abcdab",NaN)===-1. Actual: ' + ("abcd".indexOf("abcdab", NaN)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T1.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T1.js
new file mode 100644
index 0000000000..47941f97e2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T1.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    Since we deal with max(ToInteger(pos), 0) if ToInteger(pos) less than 0
+    indexOf(searchString,0) returns
+es5id: 15.5.4.7_A3_T1
+description: Call "$$abcdabcd".indexOf("ab",NaN) and check result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("$$abcdabcd".indexOf("ab", NaN) !== 2) {
+  throw new Test262Error('#1: "$$abcdabcd".indexOf("ab",NaN)===2. Actual: ' + ("$$abcdabcd".indexOf("ab", NaN)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T2.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T2.js
new file mode 100644
index 0000000000..79264306b0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T2.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    Since we deal with max(ToInteger(pos), 0) if ToInteger(pos) less than 0
+    indexOf(searchString,0) returns
+es5id: 15.5.4.7_A3_T2
+description: Call "$$abcdabcd".indexOf("ab",eval("\"-99\"")) and check result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("$$abcdabcd".indexOf("ab", eval("\"-99\"")) !== 2) {
+  throw new Test262Error('#1: "$$abcdabcd".indexOf("ab",eval("\\"-99\\""))===2. Actual: ' + ("$$abcdabcd".indexOf("ab", eval("\"-99\""))));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T3.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T3.js
new file mode 100644
index 0000000000..efcfdd118e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A3_T3.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    Since we deal with max(ToInteger(pos), 0) if ToInteger(pos) less than 0
+    indexOf(searchString,0) returns
+es5id: 15.5.4.7_A3_T3
+description: >
+    Call "$$abcdabcd".indexOf("ab",function(){return -Infinity;}())
+    and check result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("$$abcdabcd".indexOf("ab", function() {
+    return -Infinity;
+  }()) !== 2) {
+  throw new Test262Error('#1: "$$abcdabcd".indexOf("ab", function(){return -Infinity;}())===2. Actual: ' + ("$$abcdabcd".indexOf("ab", function() {
+    return -Infinity;
+  }())));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T1.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T1.js
new file mode 100644
index 0000000000..28b1e8b909
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T1.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.indexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.7_A4_T1
+description: Override toString and valueOf functions, valueOf throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    throw "intointeger";
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.indexOf(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.indexOf(__obj, __obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "intointeger") {
+    throw new Test262Error('#1.1: Exception === "intointeger". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T2.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T2.js
new file mode 100644
index 0000000000..45cc620488
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T2.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.indexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.7_A4_T2
+description: >
+    Override toString and valueOf functions, second toString throw
+    exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    throw "intointeger";
+  }
+}
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.indexOf(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.indexOf(__obj, __obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "intointeger") {
+    throw new Test262Error('#1.1: Exception === "intointeger". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T3.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T3.js
new file mode 100644
index 0000000000..fc96919f8b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T3.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.indexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.7_A4_T3
+description: Override toString and valueOf functions
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    return "1";
+  }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("ABB\u0041BABAB".indexOf(__obj, __obj2) !== 3) {
+  throw new Test262Error('#1: var __obj = {toString:function(){return "\u0041B";}}; var __obj2 = {valueOf:function(){return {};},toString:function(){return "1";}}; "ABB\\u0041BABAB".indexOf(__obj, __obj2)===3. Actual: ' + ("ABB\u0041BABAB".indexOf(__obj, __obj2)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T4.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T4.js
new file mode 100644
index 0000000000..1701373f5a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T4.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.indexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.7_A4_T4
+description: Override toString and valueOf functions, and they throw exceptions
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+};
+var __obj2 = {
+  valueOf: function() {
+    throw "intoint";
+  }
+};
+var __instance = new Number(10001.10001);
+Number.prototype.indexOf = String.prototype.indexOf;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __instance.indexOf(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __instance.indexOf(__obj, __obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T5.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T5.js
new file mode 100644
index 0000000000..59bd7c409c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A4_T5.js
@@ -0,0 +1,56 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.indexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.7_A4_T5
+description: >
+    Override toString and valueOf functions, first and second valueOf
+    throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+};
+
+var __obj2 = {
+  valueOf: function() {
+    throw "intointeger";
+  }
+};
+
+__FACTORY.prototype.indexOf = String.prototype.indexOf;
+
+var __instance = new __FACTORY(void 0);
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __instance.indexOf(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __instance.indexOf(__obj, __obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __FACTORY(value) {
+  this.value = value;
+  this.toString = function() {
+    return new Number;
+  };
+  this.valueOf = function() {
+    return this.value + ""
+  };
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T1.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T1.js
new file mode 100644
index 0000000000..dfb17a474d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf works properly
+es5id: 15.5.4.7_A5_T1
+description: Search one symbol from begin of string
+---*/
+
+var TEST_STRING = new String(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var k = 0, i = 0x0020; i < 0x007e; i++, k++) {
+  if (TEST_STRING.indexOf(String.fromCharCode(i), 0) !== k) {
+    throw new Test262Error('#' + (i - 0x0020) + ': TEST_STRING.indexOf( String.fromCharCode(' + i + '), 0 )===' + k + '. Actual: ' + TEST_STRING.indexOf(String.fromCharCode(i), 0));
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T2.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T2.js
new file mode 100644
index 0000000000..017a91506c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T2.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf works properly
+es5id: 15.5.4.7_A5_T2
+description: Search one symbol from its position in the string
+---*/
+
+var TEST_STRING = new String(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var k = 0, i = 0x0020; i < 0x007e; i++, k++) {
+  if (TEST_STRING.indexOf(String.fromCharCode(i), k) !== k) {
+    throw new Test262Error('#' + (i - 0x0020) + ': TEST_STRING.indexOf( String.fromCharCode(' + i + '), ' + k + ' )===' + k + '. Actual: ' + TEST_STRING.indexOf(String.fromCharCode(i), k));
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T3.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T3.js
new file mode 100644
index 0000000000..22f9b8328c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T3.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf works properly
+es5id: 15.5.4.7_A5_T3
+description: Search one symbol from its position+1 in the string
+---*/
+
+var TEST_STRING = new String(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var k = 0, i = 0x0020; i < 0x007e; i++, k++) {
+  if (TEST_STRING.indexOf(String.fromCharCode(i), k + 1) !== -1) {
+    throw new Test262Error('#' + (i - 0x0020) + ': TEST_STRING.indexOf( String.fromCharCode(' + i + '), ' + (k + 1) + ' )===-1. Actual: ' + TEST_STRING.indexOf(String.fromCharCode(i), k + 1));
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T4.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T4.js
new file mode 100644
index 0000000000..b257a00bb7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T4.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf works properly
+es5id: 15.5.4.7_A5_T4
+description: Search substring from begin of string
+---*/
+
+var TEST_STRING = new String(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var k = 0, i = 0x0020; i < 0x007d; i++, k++) {
+  if (TEST_STRING.indexOf((String.fromCharCode(i) + String.fromCharCode(i + 1) + String.fromCharCode(i + 2)), 0) !== k) {
+    throw new Test262Error('#' + (i - 0x0020) + ': TEST_STRING.indexOf( (String.fromCharCode(' + i + ')+ String.fromCharCode(' + (i + 1) + ') + String.fromCharCode(' + (i + 2) + ')), 0 )===' + k + '. Actual: ' + TEST_STRING.indexOf((String.fromCharCode(i) + String.fromCharCode(i + 1) + String.fromCharCode(i + 2)), 0));
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T5.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T5.js
new file mode 100644
index 0000000000..2b96e84170
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T5.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf works properly
+es5id: 15.5.4.7_A5_T5
+description: Search substring from its position in the string
+---*/
+
+var TEST_STRING = new String(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var k = 0, i = 0x0020; i < 0x007d; i++, k++) {
+  if (TEST_STRING.indexOf((String.fromCharCode(i) + String.fromCharCode(i + 1) + String.fromCharCode(i + 2)), k) !== k) {
+    throw new Test262Error('#' + (i - 0x0020) + ': TEST_STRING.indexOf( (String.fromCharCode(' + i + ')+ String.fromCharCode(' + (i + 1) + ') + String.fromCharCode(' + (i + 2) + ')), ' + k + ' )===' + k + '. Actual: ' + TEST_STRING.indexOf((String.fromCharCode(i) + String.fromCharCode(i + 1) + String.fromCharCode(i + 2)), k));
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T6.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T6.js
new file mode 100644
index 0000000000..2120268f71
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A5_T6.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf works properly
+es5id: 15.5.4.7_A5_T6
+description: Search substring from its position+1 in the string
+---*/
+
+var TEST_STRING = new String(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+for (var k = 0, i = 0x0020; i < 0x007d; i++, k++) {
+  if (TEST_STRING.indexOf((String.fromCharCode(i) + String.fromCharCode(i + 1) + String.fromCharCode(i + 2)), k + 1) !== -1) {
+    throw new Test262Error('#' + (i - 0x0020) + ': TEST_STRING.indexOf( (String.fromCharCode(' + i + ')+ String.fromCharCode(' + (i + 1) + ') + String.fromCharCode(' + (i + 2) + ')), ' + (k + 1) + ' )=== -1. Actual: ' + TEST_STRING.indexOf((String.fromCharCode(i) + String.fromCharCode(i + 1) + String.fromCharCode(i + 2)), k + 1));
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A6.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A6.js
new file mode 100644
index 0000000000..2989c9b54c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf has not prototype property
+es5id: 15.5.4.7_A6
+description: Checking String.prototype.indexOf.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.indexOf.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.indexOf.prototype === undefined. Actual: ' + String.prototype.indexOf.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A7.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A7.js
new file mode 100644
index 0000000000..aca8033023
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.indexOf can't be used as constructor
+es5id: 15.5.4.7_A7
+description: Checking if creating the String.prototype.indexOf object fails
+---*/
+
+var __FACTORY = String.prototype.indexOf;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: var __FACTORY = String.prototype.indexOf; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.2: var __FACTORY = String.prototype.indexOf; "__instance = new __FACTORY" throw a TypeError. Actual: ' + (e));
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A8.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A8.js
new file mode 100644
index 0000000000..7b64601072
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.indexOf.length property has the attribute DontEnum
+es5id: 15.5.4.7_A8
+description: >
+    Checking if enumerating the String.prototype.indexOf.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.indexOf.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.indexOf.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.indexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.indexOf.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.indexOf.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.indexOf) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.indexOf){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A9.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A9.js
new file mode 100644
index 0000000000..310d9116fc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/S15.5.4.7_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.indexOf.length property does not have the attribute
+    DontDelete
+es5id: 15.5.4.7_A9
+description: >
+    Checking if deleting the String.prototype.indexOf.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.indexOf.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.indexOf.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.indexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.indexOf.length) {
+  throw new Test262Error('#1: delete String.prototype.indexOf.length raturn true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.indexOf.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.indexOf.length; String.prototype.indexOf.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.indexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/browser.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/name.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/name.js
new file mode 100644
index 0000000000..ff0064a42f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.8
+description: >
+  String.prototype.indexOf.name is "indexOf".
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.indexOf.name, "indexOf");
+
+verifyNotEnumerable(String.prototype.indexOf, "name");
+verifyNotWritable(String.prototype.indexOf, "name");
+verifyConfigurable(String.prototype.indexOf, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/not-a-constructor.js
new file mode 100644
index 0000000000..6cc8bc2efb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.indexOf does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.indexOf),
+  false,
+  'isConstructor(String.prototype.indexOf) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.indexOf();
+}, '`new String.prototype.indexOf()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-bigint.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-bigint.js
new file mode 100644
index 0000000000..a7be5890ff
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-bigint.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for position parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  4. Let pos be ? ToInteger(position).
+features: [BigInt, Symbol.toPrimitive, computed-property-names]
+---*/
+
+assert.throws(TypeError, function() {
+  "".indexOf("", 0n);
+}, "ToInteger: BigInt => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", Object(0n));
+}, "ToInteger: unbox object with internal slot => BigInt => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    [Symbol.toPrimitive]: function() {
+      return 0n;
+    }
+  });
+}, "ToInteger: @@toPrimitive => BigInt => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    valueOf: function() {
+      return 0n;
+    }
+  });
+}, "ToInteger: valueOf => BigInt => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    toString: function() {
+      return 0n;
+    }
+  });
+}, "ToInteger: toString => BigInt => TypeError");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-errors.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-errors.js
new file mode 100644
index 0000000000..f21a3d0144
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-errors.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for position parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  4. Let pos be ? ToInteger(position).
+features: [Symbol, Symbol.toPrimitive, computed-property-names]
+---*/
+
+assert.throws(TypeError, function() {
+  "".indexOf("", Symbol("1"));
+}, "ToInteger: Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", Object(Symbol("1")));
+}, "ToInteger: unbox object with internal slot => Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    [Symbol.toPrimitive]: function() {
+      return Symbol("1");
+    }
+  });
+}, "ToInteger: @@toPrimitive => Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    valueOf: function() {
+      return Symbol("1");
+    }
+  });
+}, "ToInteger: valueOf => Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    toString: function() {
+      return Symbol("1");
+    }
+  });
+}, "ToInteger: toString => Symbol => TypeError");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-toprimitive.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-toprimitive.js
new file mode 100644
index 0000000000..68a89ae176
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-toprimitive.js
@@ -0,0 +1,167 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for position parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  4. Let pos be ? ToInteger(position).
+features: [Symbol.toPrimitive, computed-property-names]
+---*/
+
+function err() {
+  throw new Test262Error();
+}
+
+function MyError() {}
+
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: function() {
+    return 1;
+  },
+  valueOf: err,
+  toString: err
+}), 1, "ToPrimitive: @@toPrimitive takes precedence");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return 1;
+  },
+  toString: err
+}), 1, "ToPrimitive: valueOf takes precedence over toString");
+assert.sameValue("aaaa".indexOf("aa", {
+  toString: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: toString with no valueOf");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: undefined,
+  valueOf: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: skip @@toPrimitive when it's undefined");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: null,
+  valueOf: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: skip @@toPrimitive when it's null");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: null,
+  toString: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: skip valueOf when it's not callable");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: 1,
+  toString: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: skip valueOf when it's not callable");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: {},
+  toString: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: skip valueOf when it's not callable");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: skip valueOf when it returns an object");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return Object(12345);
+  },
+  toString: function() {
+    return 1;
+  }
+}), 1, "ToPrimitive: skip valueOf when it returns an object");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    [Symbol.toPrimitive]: 1
+  });
+}, "ToPrimitive: throw when @@toPrimitive is not callable");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    [Symbol.toPrimitive]: {}
+  });
+}, "ToPrimitive: throw when @@toPrimitive is not callable");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    [Symbol.toPrimitive]: function() {
+      return Object(1);
+    }
+  });
+}, "ToPrimitive: throw when @@toPrimitive returns an object");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    [Symbol.toPrimitive]: function() {
+      return {};
+    }
+  });
+}, "ToPrimitive: throw when @@toPrimitive returns an object");
+assert.throws(MyError, function() {
+  "".indexOf("", {
+    [Symbol.toPrimitive]: function() {
+      throw new MyError();
+    }
+  });
+}, "ToPrimitive: propagate errors from @@toPrimitive");
+assert.throws(MyError, function() {
+  "".indexOf("", {
+    valueOf: function() {
+      throw new MyError();
+    }
+  });
+}, "ToPrimitive: propagate errors from valueOf");
+assert.throws(MyError, function() {
+  "".indexOf("", {
+    toString: function() {
+      throw new MyError();
+    }
+  });
+}, "ToPrimitive: propagate errors from toString");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    valueOf: null,
+    toString: null
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    valueOf: 1,
+    toString: 1
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    valueOf: {},
+    toString: {}
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    valueOf: function() {
+      return Object(1);
+    },
+    toString: function() {
+      return Object(1);
+    }
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf("", {
+    valueOf: function() {
+      return {};
+    },
+    toString: function() {
+      return {};
+    }
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-wrapped-values.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-wrapped-values.js
new file mode 100644
index 0000000000..ea8e721eaa
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger-wrapped-values.js
@@ -0,0 +1,111 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for position parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  4. Let pos be ? ToInteger(position).
+features: [Symbol.toPrimitive, computed-property-names]
+---*/
+
+assert.sameValue("aaaa".indexOf("aa", Object(0)), 0, "ToPrimitive: unbox object with internal slot");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: function() {
+    return 0;
+  }
+}), 0, "ToPrimitive: @@toPrimitive");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return 0;
+  }
+}), 0, "ToPrimitive: valueOf");
+assert.sameValue("aaaa".indexOf("aa", {
+  toString: function() {
+    return 0;
+  }
+}), 0, "ToPrimitive: toString");
+assert.sameValue("aaaa".indexOf("aa", Object(NaN)), 0,
+  "ToInteger: unbox object with internal slot => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: function() {
+    return NaN;
+  }
+}), 0, "ToInteger: @@toPrimitive => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return NaN;
+  }
+}), 0, "ToInteger: valueOf => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  toString: function() {
+    return NaN;
+  }
+}), 0, "ToInteger: toString => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: function() {
+    return undefined;
+  }
+}), 0, "ToInteger: @@toPrimitive => undefined => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return undefined;
+  }
+}), 0, "ToInteger: valueOf => undefined => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  toString: function() {
+    return undefined;
+  }
+}), 0, "ToInteger: toString => undefined => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: function() {
+    return null;
+  }
+}), 0, "ToInteger: @@toPrimitive => null => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return null;
+  }
+}), 0, "ToInteger: valueOf => null => 0");
+assert.sameValue("aaaa".indexOf("aa", {
+  toString: function() {
+    return null;
+  }
+}), 0, "ToInteger: toString => null => 0");
+assert.sameValue("aaaa".indexOf("aa", Object(true)), 1,
+  "ToInteger: unbox object with internal slot => true => 1");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: function() {
+    return true;
+  }
+}), 1, "ToInteger: @@toPrimitive => true => 1");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return true;
+  }
+}), 1, "ToInteger: valueOf => true => 1");
+assert.sameValue("aaaa".indexOf("aa", {
+  toString: function() {
+    return true;
+  }
+}), 1, "ToInteger: toString => true => 1");
+assert.sameValue("aaaa".indexOf("aa", Object("1.9")), 1,
+  "ToInteger: unbox object with internal slot => parse Number => 1.9 => 1");
+assert.sameValue("aaaa".indexOf("aa", {
+  [Symbol.toPrimitive]: function() {
+    return "1.9";
+  }
+}), 1, "ToInteger: @@toPrimitive => parse Number => 1.9 => 1");
+assert.sameValue("aaaa".indexOf("aa", {
+  valueOf: function() {
+    return "1.9";
+  }
+}), 1, "ToInteger: valueOf => parse Number => 1.9 => 1");
+assert.sameValue("aaaa".indexOf("aa", {
+  toString: function() {
+    return "1.9";
+  }
+}), 1, "ToInteger: toString => parse Number => 1.9 => 1");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger.js
new file mode 100644
index 0000000000..46f49616c2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/position-tointeger.js
@@ -0,0 +1,39 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for position parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  4. Let pos be ? ToInteger(position).
+---*/
+
+assert.sameValue("aaaa".indexOf("aa", 0), 0);
+assert.sameValue("aaaa".indexOf("aa", 1), 1);
+assert.sameValue("aaaa".indexOf("aa", -0.9), 0, "ToInteger: truncate towards 0");
+assert.sameValue("aaaa".indexOf("aa", 0.9), 0, "ToInteger: truncate towards 0");
+assert.sameValue("aaaa".indexOf("aa", 1.9), 1, "ToInteger: truncate towards 0");
+assert.sameValue("aaaa".indexOf("aa", NaN), 0, "ToInteger: NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", Infinity), -1);
+assert.sameValue("aaaa".indexOf("aa", undefined), 0, "ToInteger: undefined => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", null), 0, "ToInteger: null => 0");
+assert.sameValue("aaaa".indexOf("aa", false), 0, "ToInteger: false => 0");
+assert.sameValue("aaaa".indexOf("aa", true), 1, "ToInteger: true => 1");
+assert.sameValue("aaaa".indexOf("aa", "0"), 0, "ToInteger: parse Number");
+assert.sameValue("aaaa".indexOf("aa", "1.9"), 1, "ToInteger: parse Number => 1.9 => 1");
+assert.sameValue("aaaa".indexOf("aa", "Infinity"), -1, "ToInteger: parse Number");
+assert.sameValue("aaaa".indexOf("aa", ""), 0, "ToInteger: unparseable string => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", "foo"), 0, "ToInteger: unparseable string => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", "true"), 0, "ToInteger: unparseable string => NaN => 0");
+assert.sameValue("aaaa".indexOf("aa", 2), 2);
+assert.sameValue("aaaa".indexOf("aa", "2"), 2, "ToInteger: parse Number");
+assert.sameValue("aaaa".indexOf("aa", 2.9), 2, "ToInteger: truncate towards 0");
+assert.sameValue("aaaa".indexOf("aa", "2.9"), 2, "ToInteger: parse Number => truncate towards 0");
+assert.sameValue("aaaa".indexOf("aa", [0]), 0, 'ToInteger: [0].toString() => "0" => 0');
+assert.sameValue("aaaa".indexOf("aa", ["1"]), 1, 'ToInteger: ["1"].toString() => "1" => 1');
+assert.sameValue("aaaa".indexOf("aa", {}), 0,
+  'ToInteger: ({}).toString() => "[object Object]" => NaN => 0');
+assert.sameValue("aaaa".indexOf("aa", []), 0, 'ToInteger: [].toString() => "" => NaN => 0');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-bigint.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-bigint.js
new file mode 100644
index 0000000000..42b59ffef2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-bigint.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for searchString parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  3. Let searchStr be ? ToString(searchString).
+features: [BigInt, Symbol.toPrimitive, computed-property-names]
+---*/
+
+assert.sameValue("__0__".indexOf(0n), 2, "ToString: BigInt to String");
+assert.sameValue("__0__".indexOf(Object(0n)), 2,
+  "ToString: unbox object with internal slot => BigInt to String");
+assert.sameValue("__0__".indexOf({
+  [Symbol.toPrimitive]: function() {
+    return 0n;
+  }
+}), 2, "ToString: @@toPrimitive => BigInt to String");
+assert.sameValue("__0__".indexOf({
+  valueOf: function() {
+    return 0n;
+  },
+  toString: null
+}), 2, "ToString: valueOf => BigInt to String");
+assert.sameValue("__0__".indexOf({
+  toString: function() {
+    return 0n;
+  }
+}), 2, "ToString: toString => BigInt to String");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-errors.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-errors.js
new file mode 100644
index 0000000000..9f2802c291
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-errors.js
@@ -0,0 +1,42 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for searchString parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  3. Let searchStr be ? ToString(searchString).
+features: [Symbol, Symbol.toPrimitive, computed-property-names]
+---*/
+
+assert.throws(TypeError, function() {
+  "".indexOf(Symbol("1"));
+}, "ToString: Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf(Object(Symbol("1")));
+}, "ToString: unbox object with internal slot => Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    [Symbol.toPrimitive]: function() {
+      return Symbol("1");
+    }
+  });
+}, "ToString: @@toPrimitive => Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    valueOf: function() {
+      return Symbol("1");
+    },
+    toString: null
+  });
+}, "ToString: valueOf => Symbol => TypeError");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    toString: function() {
+      return Symbol("1");
+    }
+  });
+}, "ToString: toString => Symbol => TypeError");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-toprimitive.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-toprimitive.js
new file mode 100644
index 0000000000..6c45bd6965
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-toprimitive.js
@@ -0,0 +1,163 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for searchString parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  3. Let searchStr be ? ToString(searchString).
+features: [Symbol.toPrimitive, computed-property-names]
+---*/
+
+function err() {
+  throw new Test262Error();
+}
+
+function MyError() {}
+
+assert.sameValue("__foo__".indexOf({
+  [Symbol.toPrimitive]: function() {
+    return "foo";
+  },
+  toString: err,
+  valueOf: err
+}), 2, "ToPrimitive: @@toPrimitive takes precedence");
+assert.sameValue("__foo__".indexOf({
+  toString: function() {
+    return "foo";
+  },
+  valueOf: err
+}), 2, "ToPrimitive: toString takes precedence over valueOf");
+assert.sameValue("__foo__".indexOf({
+  [Symbol.toPrimitive]: undefined,
+  toString: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: skip @@toPrimitive when it's undefined");
+assert.sameValue("__foo__".indexOf({
+  [Symbol.toPrimitive]: null,
+  toString: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: skip @@toPrimitive when it's null");
+assert.sameValue("__foo__".indexOf({
+  toString: null,
+  valueOf: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: skip toString when it's not callable");
+assert.sameValue("__foo__".indexOf({
+  toString: 1,
+  valueOf: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: skip toString when it's not callable");
+assert.sameValue("__foo__".indexOf({
+  toString: {},
+  valueOf: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: skip toString when it's not callable");
+assert.sameValue("__foo__".indexOf({
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: skip toString when it returns an object");
+assert.sameValue("__foo__".indexOf({
+  toString: function() {
+    return Object(12345);
+  },
+  valueOf: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: skip toString when it returns an object");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    [Symbol.toPrimitive]: 1
+  });
+}, "ToPrimitive: throw when @@toPrimitive is not callable");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    [Symbol.toPrimitive]: {}
+  });
+}, "ToPrimitive: throw when @@toPrimitive is not callable");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    [Symbol.toPrimitive]: function() {
+      return Object(1);
+    }
+  });
+}, "ToPrimitive: throw when @@toPrimitive returns an object");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    [Symbol.toPrimitive]: function() {
+      return {};
+    }
+  });
+}, "ToPrimitive: throw when @@toPrimitive returns an object");
+assert.throws(MyError, function() {
+  "".indexOf({
+    [Symbol.toPrimitive]: function() {
+      throw new MyError();
+    }
+  });
+}, "ToPrimitive: propagate errors from @@toPrimitive");
+assert.throws(MyError, function() {
+  "".indexOf({
+    valueOf: function() {
+      throw new MyError();
+    },
+    toString: null
+  });
+}, "ToPrimitive: propagate errors from valueOf");
+assert.throws(MyError, function() {
+  "".indexOf({
+    toString: function() {
+      throw new MyError();
+    }
+  });
+}, "ToPrimitive: propagate errors from toString");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    valueOf: null,
+    toString: null
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    valueOf: 1,
+    toString: 1
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    valueOf: {},
+    toString: {}
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    valueOf: function() {
+      return Object(1);
+    },
+    toString: function() {
+      return Object(1);
+    }
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+assert.throws(TypeError, function() {
+  "".indexOf({
+    valueOf: function() {
+      return {};
+    },
+    toString: function() {
+      return {};
+    }
+  });
+}, "ToPrimitive: throw when skipping both valueOf and toString");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-wrapped-values.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-wrapped-values.js
new file mode 100644
index 0000000000..af0c8a76c8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring-wrapped-values.js
@@ -0,0 +1,100 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for searchString parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  3. Let searchStr be ? ToString(searchString).
+features: [Symbol.toPrimitive, computed-property-names]
+---*/
+
+assert.sameValue("__foo__".indexOf(Object("foo")), 2,
+  "ToPrimitive: unbox object with internal slot");
+assert.sameValue("__foo__".indexOf({
+  [Symbol.toPrimitive]: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: @@toPrimitive");
+assert.sameValue("__foo__".indexOf({
+  valueOf: function() {
+    return "foo";
+  },
+  toString: null
+}), 2, "ToPrimitive: valueOf");
+assert.sameValue("__foo__".indexOf({
+  toString: function() {
+    return "foo";
+  }
+}), 2, "ToPrimitive: toString");
+assert.sameValue("__undefined__".indexOf({
+  [Symbol.toPrimitive]: function() {
+    return undefined;
+  }
+}), 2, 'ToString: @@toPrimitive => undefined => "undefined"');
+assert.sameValue("__undefined__".indexOf({
+  valueOf: function() {
+    return undefined;
+  },
+  toString: null
+}), 2, 'ToString: valueOf => undefined => "undefined"');
+assert.sameValue("__undefined__".indexOf({
+  toString: function() {
+    return undefined;
+  }
+}), 2, 'ToString: toString => undefined => "undefined"');
+assert.sameValue("__null__".indexOf({
+  [Symbol.toPrimitive]: function() {
+    return null;
+  }
+}), 2, 'ToString: @@toPrimitive => null => "null"');
+assert.sameValue("__null__".indexOf({
+  valueOf: function() {
+    return null;
+  },
+  toString: null
+}), 2, 'ToString: valueOf => null => "null"');
+assert.sameValue("__null__".indexOf({
+  toString: function() {
+    return null;
+  }
+}), 2, 'ToString: toString => null => "null"');
+assert.sameValue("__false__".indexOf(Object(false)), 2,
+  'ToString: unbox object with internal slot => false => "false"');
+assert.sameValue("__false__".indexOf({
+  [Symbol.toPrimitive]: function() {
+    return false;
+  }
+}), 2, 'ToString: @@toPrimitive => false => "false"');
+assert.sameValue("__false__".indexOf({
+  valueOf: function() {
+    return false;
+  },
+  toString: null
+}), 2, 'ToString: valueOf => false => "false"');
+assert.sameValue("__false__".indexOf({
+  toString: function() {
+    return false;
+  }
+}), 2, 'ToString: toString => false => "false"');
+assert.sameValue("__0__".indexOf(Object(0)), 2,
+  "ToString: unbox object with internal slot => Number to String");
+assert.sameValue("__0__".indexOf({
+  [Symbol.toPrimitive]: function() {
+    return 0;
+  }
+}), 2, "ToString: @@toPrimitive => Number to String");
+assert.sameValue("__0__".indexOf({
+  valueOf: function() {
+    return 0;
+  },
+  toString: null
+}), 2, "ToString: valueOf => Number to String");
+assert.sameValue("__0__".indexOf({
+  toString: function() {
+    return 0;
+  }
+}), 2, "ToString: toString => Number to String");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring.js
new file mode 100644
index 0000000000..fb49889399
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/searchstring-tostring.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: String.prototype.indexOf type coercion for searchString parameter
+esid: sec-string.prototype.indexof
+info: |
+  String.prototype.indexOf ( searchString [ , position ] )
+
+  3. Let searchStr be ? ToString(searchString).
+---*/
+
+assert.sameValue("foo".indexOf(""), 0);
+assert.sameValue("__foo__".indexOf("foo"), 2);
+assert.sameValue("__undefined__".indexOf(undefined), 2, 'ToString: undefined => "undefined"');
+assert.sameValue("__null__".indexOf(null), 2, 'ToString: null => "null"');
+assert.sameValue("__true__".indexOf(true), 2, 'ToString: true => "true"');
+assert.sameValue("__false__".indexOf(false), 2, 'ToString: false => "false"');
+assert.sameValue("__0__".indexOf(0), 2, "ToString: Number to String");
+assert.sameValue("__0__".indexOf(-0), 2, 'ToString: -0 => "0"');
+assert.sameValue("__Infinity__".indexOf(Infinity), 2, 'ToString: Infinity => "Infinity"');
+assert.sameValue("__-Infinity__".indexOf(-Infinity), 2, 'ToString: -Infinity => "-Infinity"');
+assert.sameValue("__NaN__".indexOf(NaN), 2, 'ToString: NaN => "NaN"');
+assert.sameValue("__123.456__".indexOf(123.456), 2, "ToString: Number to String");
+assert.sameValue("__-123.456__".indexOf(-123.456), 2, "ToString: Number to String");
+assert.sameValue("foo".indexOf([]), 0, "ToString: .toString()");
+assert.sameValue("__foo,bar__".indexOf(["foo", "bar"]), 2, "ToString: .toString()");
+assert.sameValue("__[object Object]__".indexOf({}), 2, "ToString: .toString()");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/shell.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/indexOf/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/indexOf/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..46ab36f345
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/indexOf/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.indexof
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var indexOf = String.prototype.indexOf;
+
+assert.sameValue(typeof indexOf, 'function');
+
+assert.throws(TypeError, function() {
+  indexOf.call(undefined, '');
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  indexOf.call(null, '');
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/browser.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/length.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/length.js
new file mode 100644
index 0000000000..25dacc03cf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/length.js
@@ -0,0 +1,24 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.iswellformed
+description: >
+  String.prototype.isWellFormed.length value and descriptor.
+info: |
+  String.prototype.isWellFormed( )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.isWellFormed]
+---*/
+
+verifyProperty(String.prototype.isWellFormed, 'length', {
+  configurable: true,
+  enumerable: false,
+  writable: false,
+  value: 0
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/name.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/name.js
new file mode 100644
index 0000000000..273e21c0df
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/name.js
@@ -0,0 +1,24 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.iswellformed
+description: >
+  String.prototype.isWellFormed.name value and descriptor.
+info: |
+  String.prototype.isWellFormed( )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.isWellFormed]
+---*/
+
+verifyProperty(String.prototype.isWellFormed, 'name', {
+  enumerable: false,
+  writable: false,
+  configurable: true,
+  value: 'isWellFormed'
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/not-a-constructor.js
new file mode 100644
index 0000000000..edadd4ba0a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/not-a-constructor.js
@@ -0,0 +1,35 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.includes does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [String.prototype.isWellFormed, Reflect.construct]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.isWellFormed),
+  false,
+  'isConstructor(String.prototype.isWellFormed) must return false'
+);
+
+assert.throws(TypeError, function () {
+  new String.prototype.isWellFormed();
+}, '`new String.prototype.isWellFormed()` throws TypeError');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/prop-desc.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/prop-desc.js
new file mode 100644
index 0000000000..e32cba4f00
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/prop-desc.js
@@ -0,0 +1,28 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.iswellformed
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.isWellFormed( )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.isWellFormed]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.isWellFormed,
+  'function',
+  'The value of `typeof String.prototype.isWellFormed` is "function"'
+);
+
+verifyProperty(String.prototype, 'isWellFormed', {
+  enumerable: false,
+  writable: true,
+  configurable: true
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/return-abrupt-from-this.js
new file mode 100644
index 0000000000..5796e786f7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/return-abrupt-from-this.js
@@ -0,0 +1,25 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.iswellformed
+description: >
+  Return abrupt from RequireObjectCoercible(this value).
+info: |
+  String.prototype.isWellFormed( )
+
+  1. Let O be ? RequireObjectCoercible(this value).
+
+features: [String.prototype.isWellFormed]
+---*/
+assert.sameValue(typeof String.prototype.isWellFormed, 'function');
+
+assert.throws(TypeError, function () {
+  String.prototype.isWellFormed.call(undefined);
+}, '`String.prototype.isWellFormed.call(undefined)` throws TypeError');
+
+assert.throws(TypeError, function () {
+  String.prototype.isWellFormed.call(null);
+}, '`String.prototype.isWellFormed.call(null)` throws TypeError');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/returns-boolean.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/returns-boolean.js
new file mode 100644
index 0000000000..1109670e53
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/returns-boolean.js
@@ -0,0 +1,47 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.iswellformed
+description: >
+  The method should return a boolean.
+info: |
+  String.prototype.isWellFormed ( )
+
+  1. Let O be ? RequireObjectCoercible(this value).
+  2. Let S be ? ToString(O).
+  3. Return IsStringWellFormedUnicode(S).
+
+features: [String.prototype.isWellFormed]
+---*/
+assert.sameValue(typeof String.prototype.isWellFormed, 'function');
+
+var leadingPoo = '\uD83D';
+var trailingPoo = '\uDCA9';
+var wholePoo = leadingPoo + trailingPoo;
+
+assert.sameValue(
+  ('a' + leadingPoo + 'c' + leadingPoo + 'e').isWellFormed(),
+  false,
+  'lone leading surrogates are not well-formed'
+);
+assert.sameValue(
+  ('a' + trailingPoo + 'c' + trailingPoo + 'e').isWellFormed(),
+  false,
+  'lone trailing surrogates are not well-formed'
+);
+assert.sameValue(
+  ('a' + trailingPoo + leadingPoo + 'd').isWellFormed(),
+  false,
+  'a wrong-ordered surrogate pair is not well-formed'
+)
+
+assert.sameValue('a💩c'.isWellFormed(), true, 'a surrogate pair using a literal code point is well-formed');
+assert.sameValue('a\uD83D\uDCA9c'.isWellFormed(), true, 'a surrogate pair formed by escape sequences is well-formed');
+assert.sameValue(('a' + leadingPoo + trailingPoo + 'd').isWellFormed(), true, 'a surrogate pair formed by concatenation is well-formed');
+assert.sameValue(wholePoo.slice(0, 1).isWellFormed(), false, 'a surrogate pair sliced to the leading surrogate is not well-formed');
+assert.sameValue(wholePoo.slice(1).isWellFormed(), false, 'a surrogate pair sliced to the trailing surrogate is not well-formed');
+assert.sameValue('abc'.isWellFormed(), true, 'a latin-1 string is well-formed');
+assert.sameValue('a\u25A8c'.isWellFormed(), true, 'a non-ASCII character is well-formed');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/shell.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/to-string-primitive.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/to-string-primitive.js
new file mode 100644
index 0000000000..5ef95cf21a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/to-string-primitive.js
@@ -0,0 +1,35 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.iswellformed
+description: >
+  The method should coerce the receiver to a string.
+info: |
+  String.prototype.isWellFormed ( )
+
+  2. Let S be ? ToString(O).
+  …
+
+features: [String.prototype.isWellFormed]
+---*/
+
+const tests = [
+  [true, Boolean.prototype],
+  [1, Number.prototype],
+  [1n, BigInt.prototype],
+];
+
+for (const [v, proto] of tests) {
+  proto.toString = function() {
+    throw new Test262Error(`should not call toString on the prototype for ${typeof v}`);
+  }
+  let result = String.prototype.isWellFormed.call(v);
+  delete proto.toString;
+  assert.sameValue(result, true, `isWellFormed for ${typeof v}`);
+}
+
+Symbol.prototype.toString = function() { throw new TypeError("should not call toString on the prototype for Symbol"); }
+assert.throws(TypeError, () => String.prototype.isWellFormed.call(Symbol()), `Built-in result for Symbol`);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/isWellFormed/to-string.js b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/to-string.js
new file mode 100644
index 0000000000..1d5035d9b4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/isWellFormed/to-string.js
@@ -0,0 +1,30 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.isWellFormed||!xulRuntime.shell) -- String.prototype.isWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.iswellformed
+description: >
+  The method should coerce the receiver to a string.
+info: |
+  String.prototype.isWellFormed ( )
+
+  1. Let O be ? RequireObjectCoercible(this value).
+  2. Let S be ? ToString(O).
+  3. Return IsStringWellFormedUnicode(S).
+
+features: [String.prototype.isWellFormed]
+---*/
+
+var obj = {
+    toString: function () {
+        throw new Test262Error('calls ToString');
+    }
+};
+
+assert.throws(
+    Test262Error,
+    function () { String.prototype.isWellFormed.call(obj); },
+    'coerces the receiver to a string'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A10.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A10.js
new file mode 100644
index 0000000000..b3d53f4bc6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A10.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.lastIndexOf.length property has the attribute
+    ReadOnly
+es5id: 15.5.4.8_A10
+description: >
+    Checking if varying the String.prototype.lastIndexOf.length
+    property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.lastIndexOf.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.lastIndexOf.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.lastIndexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.lastIndexOf.length;
+
+verifyNotWritable(String.prototype.lastIndexOf, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.lastIndexOf.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.lastIndexOf.length; String.prototype.lastIndexOf.length = function(){return "shifted";}; String.prototype.lastIndexOf.length === __obj. Actual: ' + String.prototype.lastIndexOf.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A11.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A11.js
new file mode 100644
index 0000000000..c1805c8009
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the lastIndexOf method is 1
+es5id: 15.5.4.8_A11
+description: Checking String.prototype.lastIndexOf.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.lastIndexOf.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.lastIndexOf.hasOwnProperty("length") return true. Actual: ' + String.prototype.lastIndexOf.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.lastIndexOf.length !== 1) {
+  throw new Test262Error('#2: String.prototype.lastIndexOf.length === 1. Actual: ' + String.prototype.lastIndexOf.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T1.js
new file mode 100644
index 0000000000..4251d7d213
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T1
+description: Arguments are false and true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.lastIndexOf = String.prototype.lastIndexOf;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.lastIndexOf(true, false) !== 0) {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.lastIndexOf = String.prototype.lastIndexOf;  __instance.lastIndexOf(true, false) === 0. Actual: ' + __instance.lastIndexOf(true, false));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T10.js
new file mode 100644
index 0000000000..fcf2b12f24
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T10.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T10
+description: >
+    Call lastIndexOf(searchString, position) function with object
+    arguments
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return NaN;
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.lastIndexOf(__obj, __obj2) !== 7) {
+  throw new Test262Error('#1: var x; var __obj = {toString:function(){return "\u0041B";}}; var __obj2 = {valueOf:function(){return NaN;}}; var __str = "ABB\u0041BABAB";lastIndexOf(__obj, __obj2) === 7. Actual: ' + __str.lastIndexOf(__obj, __obj2));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T12.js
new file mode 100644
index 0000000000..eff60d1894
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T12.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T12
+description: Argument is string, and instance is array of strings
+---*/
+
+var __instance = new Array('new', 'zoo', 'revue');
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.lastIndexOf('new') !== 0) {
+  throw new Test262Error('#1: __instance = new Array(\'new\',\'zoo\',\'revue\'); __instance.lastIndexOf(\'new\') === 0. Actual: ' + __instance.lastIndexOf('new'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__instance.lastIndexOf('zoo') !== 1) {
+  throw new Test262Error('#2: __instance = new Array(\'new\',\'zoo\',\'revue\'); __instance.lastIndexOf(\'zoo\') === 1. Actual: ' + __instance.lastIndexOf('zoo'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T2.js
new file mode 100644
index 0000000000..714bbaaa3c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T2.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T2
+description: >
+    Arguments are boolean equation, function and null, and instance is
+    Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.lastIndexOf = String.prototype.lastIndexOf;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.lastIndexOf("A" !== "\u0041", function() {
+    return 0;
+  }(), null) !== 0) {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.lastIndexOf = String.prototype.lastIndexOf;  __instance.lastIndexOf("A"!=="\\u0041", function(){return 0;}(),null) === 0. Actual: ' + __instance.lastIndexOf("A" !== "\u0041", function() {
+    return 0;
+  }(), null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T4.js
new file mode 100644
index 0000000000..e89a5a0902
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T4.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T4
+description: >
+    Call lastIndexOf(searchString, position) function without
+    arguments of string
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString() evaluates to "" lastIndexOf() evaluates to lastIndexOf("",0)
+if ("".lastIndexOf() !== -1) {
+  throw new Test262Error('#1: "".lastIndexOf() === -1. Actual: ' + ("".lastIndexOf()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T5.js
new file mode 100644
index 0000000000..6e2f0811c4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T5.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T5
+description: >
+    Call lastIndexOf(searchString, position) function with null
+    argument of function object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" lastIndexOf(null) evaluates to lastIndexOf("",0)
+if (function() {
+    return "gnullunazzgnull"
+  }().lastIndexOf(null) !== 11) {
+  throw new Test262Error('#1: function(){return "gnullunazzgnull"}().lastIndexOf(null) === 11. Actual: ' + function() {
+    return "gnullunazzgnull"
+  }().lastIndexOf(null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T6.js
new file mode 100644
index 0000000000..90b28bc8b9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T6
+description: >
+    Call lastIndexOf(searchString, position) function with x argument
+    of new String object, where x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "" lastIndexOf(undefined) evaluates to lastIndexOf("",0)
+if (new String("undefined").lastIndexOf(x) !== 0) {
+  throw new Test262Error('#1: var x; new String("undefined").lastIndexOf(x) === 0. Actual: ' + new String("undefined").lastIndexOf(x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T7.js
new file mode 100644
index 0000000000..c8f5af9551
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T7
+description: >
+    Call lastIndexOf(searchString, position) function with undefined
+    argument of string object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" lastIndexOf(undefined) evaluates to lastIndexOf("undefined",0)
+if (String("undefined").lastIndexOf(undefined) !== 0) {
+  throw new Test262Error('#1: String("undefined").lastIndexOf(undefined) === 0. Actual: ' + String("undefined").lastIndexOf(undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T8.js
new file mode 100644
index 0000000000..e048c8fc7d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T8.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T8
+description: >
+    Call lastIndexOf(searchString, position) function with void 0
+    argument of string object
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(void 0) evaluates to "undefined" lastIndexOf(void 0) evaluates to lastIndexOf("undefined",0)
+if (String(__obj).lastIndexOf(void 0) !== 0) {
+  throw new Test262Error('#1: __obj = {toString:function(){}}; String(__obj).lastIndexOf(void 0) === 0. Actual: ' + String(__obj).lastIndexOf(void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T9.js
new file mode 100644
index 0000000000..942f54a2a4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A1_T9.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf(searchString, position)
+es5id: 15.5.4.8_A1_T9
+description: >
+    Call lastIndexOf(searchString, position) function with
+    function(){}() argument of string object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" indexOf(undefined) evaluates to indexOf("undefined")
+if (new String(__obj).lastIndexOf(function() {}()) !== 0) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; new String(__obj).lastIndexOf(function(){}()) === 0. Actual: ' + new String(__obj).lastIndexOf(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T1.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T1.js
new file mode 100644
index 0000000000..da1ba6bd97
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T1.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.lastIndexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.8_A4_T1
+description: Override toString and valueOf functions, valueOf throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    throw "intointeger";
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.lastIndexOf(__obj, __obj2);
+  throw new Test262Error('#1: var x = __str.lastIndexOf(__obj, __obj2) lead to throwing exception');
+} catch (e) {
+  if (e !== "intointeger") {
+    throw new Test262Error('#1.1: Exception === "intointeger". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T2.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T2.js
new file mode 100644
index 0000000000..a75fbedea6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T2.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.lastIndexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.8_A4_T2
+description: >
+    Override toString and valueOf functions, second toString throw
+    exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    throw "intointeger";
+  }
+}
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.lastIndexOf(__obj, __obj2);
+  throw new Test262Error('#1: var x = __str.lastIndexOf(__obj, __obj2) lead to throwing exception');
+} catch (e) {
+  if (e !== "intointeger") {
+    throw new Test262Error('#1.1: Exception === "intointeger". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T3.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T3.js
new file mode 100644
index 0000000000..944857f3f7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T3.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.lastIndexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.8_A4_T3
+description: Override toString and valueOf functions
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {}
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("ABB\u0041BABAB".lastIndexOf(__obj, __obj2) !== 7) {
+  throw new Test262Error('#1: var __obj = {toString:function(){return "\u0041B";}}; var __obj2 = {valueOf:function(){return {};},toString:function(){}}; "ABB\\u0041BABAB".lastIndexOf(__obj, __obj2)===7. Actual: ' + ("ABB\u0041BABAB".lastIndexOf(__obj, __obj2)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T4.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T4.js
new file mode 100644
index 0000000000..7994195012
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T4.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.lastIndexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.8_A4_T4
+description: Override toString and valueOf functions, and they throw exceptions
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+};
+var __obj2 = {
+  valueOf: function() {
+    throw "intoint";
+  }
+};
+var __instance = new Number(10001.10001);
+Number.prototype.lastIndexOf = String.prototype.lastIndexOf;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __instance.lastIndexOf(__obj, __obj2);
+  throw new Test262Error('#1: var x = __instance.lastIndexOf(__obj, __obj2) lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T5.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T5.js
new file mode 100644
index 0000000000..4921647303
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A4_T5.js
@@ -0,0 +1,56 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.lastIndexOf(searchString, position) is called first Call ToString, giving it the this value as its argument.
+    Then Call ToString(searchString) and Call ToNumber(position)
+es5id: 15.5.4.8_A4_T5
+description: >
+    Override toString and valueOf functions, first and second valueOf
+    throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+};
+
+var __obj2 = {
+  valueOf: function() {
+    throw "intointeger";
+  }
+};
+
+__FACTORY.prototype.lastIndexOf = String.prototype.lastIndexOf;
+
+var __instance = new __FACTORY(void 0);
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __instance.lastIndexOf(__obj, __obj2);
+  throw new Test262Error('#1: var x = __instance.lastIndexOf(__obj, __obj2) lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __FACTORY(value) {
+  this.value = value;
+  this.toString = function() {
+    return new Number;
+  };
+  this.valueOf = function() {
+    return this.value + ""
+  };
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A6.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A6.js
new file mode 100644
index 0000000000..8bd0287c74
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf has not prototype property
+es5id: 15.5.4.8_A6
+description: Checking String.prototype.lastIndexOf.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.lastIndexOf.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.lastIndexOf.prototype === undefined. Actual: ' + String.prototype.lastIndexOf.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A7.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A7.js
new file mode 100644
index 0000000000..0838bbcd81
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A7.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.lastIndexOf can't be used as constructor
+es5id: 15.5.4.8_A7
+description: Checking if creating the String.prototype.lastIndexOf object fails
+---*/
+
+var FACTORY = String.prototype.lastIndexOf;
+
+assert.throws(TypeError, function() {
+  new FACTORY;
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A8.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A8.js
new file mode 100644
index 0000000000..ab788685bc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A8.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.lastIndexOf.length property has the attribute
+    DontEnum
+es5id: 15.5.4.8_A8
+description: >
+    Checking if enumerating the String.prototype.lastIndexOf.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.lastIndexOf.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.lastIndexOf.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.lastIndexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.lastIndexOf.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.lastIndexOf.propertyIsEnumerable(\'length\') return false. Actual: ' + String.prototype.lastIndexOf.propertyIsEnumerable('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.lastIndexOf) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.lastIndexOf){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A9.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A9.js
new file mode 100644
index 0000000000..d592c5357d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/S15.5.4.8_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.lastIndexOf.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.8_A9
+description: >
+    Checking if deleting the String.prototype.lastIndexOf.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.lastIndexOf.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.lastIndexOf.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.lastIndexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.lastIndexOf.length) {
+  throw new Test262Error('#1: delete String.prototype.lastIndexOf.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.lastIndexOf.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.lastIndexOf.length; String.prototype.lastIndexOf.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.lastIndexOf.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/browser.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/name.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/name.js
new file mode 100644
index 0000000000..62353147a8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.9
+description: >
+  String.prototype.lastIndexOf.name is "lastIndexOf".
+info: |
+  String.prototype.lastIndexOf ( searchString [ , position ] )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.lastIndexOf.name, "lastIndexOf");
+
+verifyNotEnumerable(String.prototype.lastIndexOf, "name");
+verifyNotWritable(String.prototype.lastIndexOf, "name");
+verifyConfigurable(String.prototype.lastIndexOf, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/not-a-constructor.js
new file mode 100644
index 0000000000..14485de716
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.lastIndexOf does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.lastIndexOf),
+  false,
+  'isConstructor(String.prototype.lastIndexOf) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.lastIndexOf();
+}, '`new String.prototype.lastIndexOf()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/shell.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..e8ceaa298d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/lastIndexOf/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.lastindexof
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var lastIndexOf = String.prototype.lastIndexOf;
+
+assert.sameValue(typeof lastIndexOf, 'function');
+
+assert.throws(TypeError, function() {
+  lastIndexOf.call(undefined, '');
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  lastIndexOf.call(null, '');
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_3.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_3.js
new file mode 100644
index 0000000000..35f29b09bf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_3.js
@@ -0,0 +1,25 @@
+// Copyright 2013 Mozilla Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.9_3
+description: >
+    Tests that String.prototype.localeCompare treats a missing  "that"
+    argument, undefined, and "undefined" as equivalent.
+author: Norbert Lindenberg
+---*/
+
+var thisValues = ["a", "t", "u", "undefined", "UNDEFINED", "nicht definiert", "xyz", "未定义"];
+
+var i;
+for (i = 0; i < thisValues.length; i++) {
+  var thisValue = thisValues[i];
+  if (thisValue.localeCompare() !== thisValue.localeCompare(undefined)) {
+    throw new Test262Error("String.prototype.localeCompare does not treat missing 'that' argument as undefined.");
+  }
+  if (thisValue.localeCompare(undefined) !== thisValue.localeCompare("undefined")) {
+    throw new Test262Error("String.prototype.localeCompare does not treat undefined 'that' argument as \"undefined\".");
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_CE.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_CE.js
new file mode 100644
index 0000000000..65f9289ccb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/15.5.4.9_CE.js
@@ -0,0 +1,78 @@
+// Copyright 2012 Norbert Lindenberg. All rights reserved.
+// Copyright 2012 Mozilla Corporation. All rights reserved.
+// Copyright 2013 Microsoft Corporation. All rights reserved.
+// Copyright (C) 2022 Richard Gibson. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: >
+    String.prototype.localeCompare must return 0 when
+    comparing Strings that are considered canonically equivalent by
+    the Unicode Standard.
+esid: sec-string.prototype.localecompare
+info: |
+    String.prototype.localeCompare ( _that_ [ , _reserved1_ [ , _reserved2_ ] ] )
+
+    This function must treat Strings that are canonically equivalent
+    according to the Unicode standard as identical and must return `0`
+    when comparing Strings that are considered canonically equivalent.
+---*/
+
+// pairs with characters not in Unicode 3.0 are commented out
+var pairs = [
+  // example from Unicode 5.0, section 3.7, definition D70
+  ["o\u0308", "ö"],
+  // examples from Unicode 5.0, chapter 3.11
+  ["ä\u0323", "a\u0323\u0308"],
+  ["a\u0308\u0323", "a\u0323\u0308"],
+  ["ạ\u0308", "a\u0323\u0308"],
+  ["ä\u0306", "a\u0308\u0306"],
+  ["ă\u0308", "a\u0306\u0308"],
+  // example from Unicode 5.0, chapter 3.12
+  ["\u1111\u1171\u11B6", "퓛"],
+  // examples from UTS 10, Unicode Collation Algorithm
+  ["Å", "Å"],
+  ["Å", "A\u030A"],
+  ["x\u031B\u0323", "x\u0323\u031B"],
+  ["ự", "ụ\u031B"],
+  ["ự", "u\u031B\u0323"],
+  ["ự", "ư\u0323"],
+  ["ự", "u\u0323\u031B"],
+  // examples from UAX 15, Unicode Normalization Forms
+  ["Ç", "C\u0327"],
+  ["q\u0307\u0323", "q\u0323\u0307"],
+  ["가", "\u1100\u1161"],
+  ["Å", "A\u030A"],
+  ["Ω", "Ω"],
+  ["Å", "A\u030A"],
+  ["ô", "o\u0302"],
+  ["ṩ", "s\u0323\u0307"],
+  ["ḋ\u0323", "d\u0323\u0307"],
+  ["ḋ\u0323", "ḍ\u0307"],
+  ["q\u0307\u0323", "q\u0323\u0307"],
+  // examples involving supplementary characters from UCD NormalizationTest.txt
+  //  ["\uD834\uDD5E", "\uD834\uDD57\uD834\uDD65"],
+  //  ["\uD87E\uDC2B", "北"]
+];
+
+var i;
+for (i = 0; i < pairs.length; i++) {
+  var pair = pairs[i];
+  if (pair[0].localeCompare(pair[1]) !== 0) {
+    throw new Test262Error("String.prototype.localeCompare considers " + pair[0] + " (" + toU(pair[0]) +
+      ") ≠ " + pair[1] + " (" + toU(pair[1]) + ").");
+  }
+}
+
+function toU(s) {
+  var result = "";
+  var escape = "\\u0000";
+  var i;
+  for (i = 0; i < s.length; i++) {
+    var hex = s.charCodeAt(i).toString(16);
+    result += escape.substring(0, escape.length - hex.length) + hex;
+  }
+  return result;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A10.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A10.js
new file mode 100644
index 0000000000..54f9d6a752
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A10.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.localeCompare.length property has the attribute
+    ReadOnly
+es5id: 15.5.4.9_A10
+description: >
+    Checking if varying the String.prototype.localeCompare.length
+    property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.localeCompare.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.localeCompare.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.localeCompare.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.localeCompare.length;
+
+verifyNotWritable(String.prototype.localeCompare, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.localeCompare.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.localeCompare.length; String.prototype.localeCompare.length = function(){return "shifted";}; String.prototype.localeCompare.length === __obj. Actual: ' + String.prototype.localeCompare.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A11.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A11.js
new file mode 100644
index 0000000000..c918779e18
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the localeCompare method is 1
+es5id: 15.5.4.9_A11
+description: Checking String.prototype.localeCompare.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.localeCompare.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.localeCompare.hasOwnProperty("length") return true. Actual: ' + String.prototype.localeCompare.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.localeCompare.length !== 1) {
+  throw new Test262Error('#2: String.prototype.localeCompare.length === 1. Actual: ' + String.prototype.localeCompare.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A1_T1.js
new file mode 100644
index 0000000000..1ee5c6feed
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A1_T1.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.localeCompare(that)
+es5id: 15.5.4.9_A1_T1
+description: This string is symbol and arguments are symbols
+---*/
+
+var str1 = new String("h");
+//CHECK#1
+var str2 = new String("\x68");
+if (str1.localeCompare(str2) !== 0) {
+  throw new Test262Error('#1: var str1 = new String("h"); var str2 = new String ("\\x68"); str1.localeCompare(str2)===0. Actual: ' + str1.localeCompare(str2));
+}
+
+//CHECK#2
+var str2 = new String("\u0068");
+if (str1.localeCompare(str2) !== 0) {
+  throw new Test262Error('#2: var str1 = new String("h"); var str2 = new String ("\\u0068"); str1.localeCompare(str2)===0. Actual: ' + str1.localeCompare(str2));
+}
+
+//CHECK#3
+var str2 = new String("h");
+if (str1.localeCompare(str2) !== 0) {
+  throw new Test262Error('#3: var str1 = new String("h"); var str2 = new String ("h"); str1.localeCompare(str2)===0. Actual: ' + str1.localeCompare(str2));
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A1_T2.js
new file mode 100644
index 0000000000..c1e239905a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A1_T2.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.localeCompare(that)
+es5id: 15.5.4.9_A1_T2
+description: >
+    Call string_1.localeCompare(string_2) is equal
+    -string_2.localeCompare(string_1)
+---*/
+
+//CHECK#1
+var str1 = "h";
+var str2 = "H";
+if (str1.localeCompare(str2) !== -str2.localeCompare(str1)) {
+  throw new Test262Error('#1.1: var str1 = "h"; var str2 = "H"; str1.localeCompare(str2)===-str2.localeCompare(str1). Actual: ' + str1.localeCompare(str2));
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A6.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A6.js
new file mode 100644
index 0000000000..0123826201
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.localeCompare has not prototype property
+es5id: 15.5.4.9_A6
+description: Checking String.prototype.localeCompare.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.localeCompare.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.localeCompare.prototype === undefined. Actual: ' + String.prototype.localeCompare.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A7.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A7.js
new file mode 100644
index 0000000000..70b08ba27f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.localeCompare can't be used as constructor
+es5id: 15.5.4.9_A7
+description: >
+    Checking if creating the String.prototype.localeCompare object
+    fails
+---*/
+
+var __FACTORY = String.prototype.localeCompare;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.localeCompare; __instance = new __FACTORY lead to throwing exception');
+} catch (e) {
+  if (e instanceof Test262Error) throw e;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A8.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A8.js
new file mode 100644
index 0000000000..09b84b3a31
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A8.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.localeCompare.length property has the attribute
+    DontEnum
+es5id: 15.5.4.9_A8
+description: >
+    Checking if enumerating the String.prototype.localeCompare.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.localeCompare.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.localeCompare.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.localeCompare.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.localeCompare.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.localeCompare.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.localeCompare) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.localeCompare){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A9.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A9.js
new file mode 100644
index 0000000000..fe5f58266e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/S15.5.4.9_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.localeCompare.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.9_A9
+description: >
+    Checking if deleting the String.prototype.localeCompare.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.localeCompare.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.localeCompare.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.localeCompare.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.localeCompare.length) {
+  throw new Test262Error('#1: delete String.prototype.localeCompare.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.localeCompare.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.localeCompare.length; String.prototype.localeCompare.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.localeCompare.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/browser.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/name.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/name.js
new file mode 100644
index 0000000000..81a2062386
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.10
+description: >
+  String.prototype.localeCompare.name is "localeCompare".
+info: |
+  String.prototype.localeCompare ( that [, reserved1 [ , reserved2 ] ] )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.localeCompare.name, "localeCompare");
+
+verifyNotEnumerable(String.prototype.localeCompare, "name");
+verifyNotWritable(String.prototype.localeCompare, "name");
+verifyConfigurable(String.prototype.localeCompare, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/not-a-constructor.js
new file mode 100644
index 0000000000..c335172ddc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.localeCompare does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.localeCompare),
+  false,
+  'isConstructor(String.prototype.localeCompare) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.localeCompare();
+}, '`new String.prototype.localeCompare()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/shell.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/localeCompare/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/localeCompare/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..c76b2750f4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/localeCompare/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.localecompare
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var localeCompare = String.prototype.localeCompare;
+
+assert.sameValue(typeof localeCompare, 'function');
+
+assert.throws(TypeError, function() {
+  localeCompare.call(undefined, '');
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  localeCompare.call(null, '');
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T10.js
new file mode 100644
index 0000000000..0c34ca8972
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T10.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T10
+description: Call match (regexp) function with object argument
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.match(__obj)[0] !== "AB") {
+  throw new Test262Error('#1: var x; var __obj = {toString:function(){return "\u0041B";}}; var __str = "ABB\u0041BABAB"; __str.match(__obj)[0] ==="AB". Actual: ' + __str.match(__obj)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T11.js
new file mode 100644
index 0000000000..7ed0b42606
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T11.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T11
+description: >
+    Override toString function, toString throw exception, then call
+    match (regexp) function with this object as argument
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.match(__obj);
+  throw new Test262Error('#1: "var x = __str.match(__obj)" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T12.js
new file mode 100644
index 0000000000..d90588e14f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T12.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T12
+description: >
+    Override toString and valueOf functions, valueOf throw exception,
+    then call match (regexp) function with this object as argument
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+}
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.match(__obj);
+  throw new Test262Error('#1: "var x = __str.match(__obj)" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T13.js
new file mode 100644
index 0000000000..3461822606
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T13.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T13
+description: >
+    Override toString and valueOf functions, then call match (regexp)
+    function with this object as argument
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return 1;
+  }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("ABB\u0041B\u0031ABAB\u0031BBAA".match(__obj)[0] !== "1") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; "ABB\\u0041B\\u0031ABAB\\u0031BBAA".match(__obj)[0] ==="1". Actual: ' + ("ABB\u0041B\u0031ABAB\u0031BBAA".match(__obj)[0]));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if ("ABB\u0041B\u0031ABAB\u0031BBAA".match(__obj).length !== 1) {
+  throw new Test262Error('#3: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; "ABB\\u0041B\\u0031ABAB\\u0031BBAA".match(__obj).length === 1. Actual: ' + ("ABB\u0041B\u0031ABAB\u0031BBAA".match(__obj).length));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T14.js
new file mode 100644
index 0000000000..cec34fd63a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T14.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T14
+description: >
+    Call match (regexp) function with RegExp object as argument from
+    string
+---*/
+
+var __reg = new RegExp("77");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("ABB\u0041BABAB\u0037\u0037BBAA".match(__reg)[0] !== "77") {
+  throw new Test262Error('#1: var __reg = new RegExp("77"); "ABB\\u0041BABAB\\u0037\\u0037BBAA".match(__reg)[0] === "77". Actual: ' + ("ABB\u0041BABAB\u0037\u0037BBAA".match(__reg)[0]));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T3.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T3.js
new file mode 100644
index 0000000000..e8d7c8b47a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T3.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T3
+description: Checking by using eval
+---*/
+
+var match = String.prototype.match.bind(this);
+
+try {
+  this.toString = Object.prototype.toString;
+} catch (e) {;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ((this.toString === Object.prototype.toString) && //Ensure we could overwrite global obj's toString
+  (match(eval("\"bj\""))[0] !== "bj")) {
+  throw new Test262Error('#1: match = String.prototype.match.bind(this); match(eval("\\"bj\\""))[0] === "bj". Actual: ' + match(eval("\"bj\""))[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T4.js
new file mode 100644
index 0000000000..928aae387d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T4.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T4
+description: Call match (regexp) function without arguments of string
+---*/
+
+var __matched = "".match();
+
+var __expected = RegExp().exec("");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__matched.length !== __expected.length) {
+  throw new Test262Error('#1: __matched = "".match(); __expected = RegExp().exec(""); __matched.length === __expected.length. Actual: ' + __matched.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__matched.index !== __expected.index) {
+  throw new Test262Error('#2: __matched = "".match(); __expected = RegExp().exec(""); __matched.index === __expected.index. Actual: ' + __matched.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__matched.input !== __expected.input) {
+  throw new Test262Error('#3: __matched = "".match(); __expected = RegExp().exec(""); __matched.input === __expected.input. Actual: ' + __matched.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__matched[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __matched = "".match(); __expected = RegExp().exec(""); __matched[' + index + ']===__expected[' + index + ']. Actual: ' + __matched[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T5.js
new file mode 100644
index 0000000000..7fd4c470ef
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T5
+description: Call match (regexp) function with null argument of function object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" match(null) evaluates to match("null")
+if (function() {
+    return "gnulluna"
+  }().match(null)[0] !== "null") {
+  throw new Test262Error('#1: function(){return "gnulluna"}().match(null)[0] === "null". Actual: ' + function() {
+    return "gnulluna"
+  }().match(null)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T6.js
new file mode 100644
index 0000000000..164c22a560
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T6.js
@@ -0,0 +1,52 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T6
+description: >
+    Call match (regexp) function with x argument of new String object,
+    where x is undefined variable
+---*/
+
+var __matched = new String("undefined").match(x);
+
+var __expected = RegExp(x).exec("undefined");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__matched.length !== __expected.length) {
+  throw new Test262Error('#1: __matched = new String("undefined").match(x); __expected = RegExp(x).exec("undefined"); __matched.length === __expected.length. Actual: ' + __matched.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__matched.index !== __expected.index) {
+  throw new Test262Error('#2: __matched = new String("undefined").match(x); __expected = RegExp(x).exec("undefined"); __matched.index === __expected.index. Actual: ' + __matched.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__matched.input !== __expected.input) {
+  throw new Test262Error('#3: __matched = new String("undefined").match(x); __expected = RegExp(x).exec("undefined"); __matched.input === __expected.input. Actual: ' + __matched.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__matched[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __matched = new String("undefined").match(x); __expected = RegExp(x).exec("undefined"); __matched[' + index + ']===__expected[' + index + ']. Actual: ' + __matched[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T7.js
new file mode 100644
index 0000000000..3af4c9c7d7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T7.js
@@ -0,0 +1,50 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T7
+description: >
+    Call match (regexp) function with undefined argument of string
+    object
+---*/
+
+var __matched = String("undefined").match(undefined);
+
+var __expected = RegExp(undefined).exec("undefined");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__matched.length !== __expected.length) {
+  throw new Test262Error('#1: __matched = String("undefined").match(undefined); __expected = RegExp(undefined).exec("undefined"); __matched.length === __expected.length. Actual: ' + __matched.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__matched.index !== __expected.index) {
+  throw new Test262Error('#2: __matched = String("undefined").match(undefined); __expected = RegExp(undefined).exec("undefined"); __matched.index === __expected.index. Actual: ' + __matched.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__matched.input !== __expected.input) {
+  throw new Test262Error('#3: __matched = String("undefined").match(undefined); __expected = RegExp(undefined).exec("undefined"); __matched.input === __expected.input. Actual: ' + __matched.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__matched[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __matched = String("undefined").match(undefined); __expected = RegExp(undefined).exec("undefined"); __matched[' + index + ']===__expected[' + index + ']. Actual: ' + __matched[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T8.js
new file mode 100644
index 0000000000..e5c5b25a87
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T8.js
@@ -0,0 +1,52 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T8
+description: Call match (regexp) function with void 0 argument of string object;
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+var __matched = String(__obj).match(void 0);
+
+var __expected = RegExp(void 0).exec("undefined");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__matched.length !== __expected.length) {
+  throw new Test262Error('#1: __obj = {toString:function(){}}; __matched = String(__obj).match(void 0); __expected = RegExp(void 0).exec("undefined"); __matched.length === __expected.length. Actual: ' + __matched.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__matched.index !== __expected.index) {
+  throw new Test262Error('#2: __obj = {toString:function(){}}; __matched = String(__obj).match(void 0); __expected = RegExp(void 0).exec("undefined"); __matched.index === __expected.index. Actual: ' + __matched.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__matched.input !== __expected.input) {
+  throw new Test262Error('#3: __obj = {toString:function(){}}; __matched = String(__obj).match(void 0); __expected = RegExp(void 0).exec("undefined"); __matched.input === __expected.input. Actual: ' + __matched.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__matched[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __obj = {toString:function(){}}; __matched = String(__obj).match(void 0); __expected = RegExp(void 0).exec("undefined"); __matched[' + index + ']===__expected[' + index + ']. Actual: ' + __matched[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T9.js
new file mode 100644
index 0000000000..5e6a56d28b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A1_T9.js
@@ -0,0 +1,55 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T9
+description: >
+    Call match (regexp) function with function(){}() argument of
+    string object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+var __matched = new String(__obj).match(function() {}());
+
+var __expected = RegExp(undefined).exec("undefined");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__matched.length !== __expected.length) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; __matched = new String(__obj).match(function(){}()); __expected = RegExp(undefined).exec("undefined"); __matched.length === __expected.length. Actual: ' + __matched.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__matched.index !== __expected.index) {
+  throw new Test262Error('#2: __obj = {valueOf:function(){}, toString:void 0}; __matched = new String(__obj).match(function(){}()); __expected = RegExp(undefined).exec("undefined"); __matched.index === __expected.index. Actual: ' + __matched.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__matched.input !== __expected.input) {
+  throw new Test262Error('#3: __obj = {valueOf:function(){}, toString:void 0}; __matched = new String(__obj).match(function(){}()); __expected = RegExp(undefined).exec("undefined"); __matched.input === __expected.input. Actual: ' + __matched.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__matched[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __obj = {valueOf:function(){}, toString:void 0}; __matched = new String(__obj).match(function(){}()); __expected = RegExp(undefined).exec("undefined"); __matched[' + index + ']===__expected[' + index + ']. Actual: ' + __matched[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T1.js
new file mode 100644
index 0000000000..2d3d430675
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T1.js
@@ -0,0 +1,44 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T1
+description: Regular expression is 3
+---*/
+
+var __string = "1234567890";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(3)[0] !== "3") {
+  throw new Test262Error('#1: __string = "1234567890"; __string.match(3)[0]=== "3". Actual: ' + __string.match(3)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(3).length !== 1) {
+  throw new Test262Error('#2: __string = "1234567890"; __string.match(3).length ===1. Actual: ' + __string.match(3).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__string.match(3).index !== 2) {
+  throw new Test262Error('#3: __string = "1234567890"; __string.match(3).index ===2. Actual: ' + __string.match(3).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__string.match(3).input !== __string) {
+  throw new Test262Error('#4: __string = "1234567890"; __string.match(3).input ===__string. Actual: ' + __string.match(3).input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T10.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T10.js
new file mode 100644
index 0000000000..a39d448e24
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T10.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T10
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/. Last match is
+    undefined.  And regular expression object have property lastIndex
+    = tested_string.lastIndexOf("0")
+---*/
+
+var __string = "Boston, MA 02134";
+
+var __matches = ["02134", "02134", undefined];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/;
+
+__re.lastIndex = __string.lastIndexOf("0");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== 3) {
+  throw new Test262Error('#1: __string.match(__re).length=== 3. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(__re).index !== __string.lastIndexOf("0")) {
+  throw new Test262Error('#2: __string.match(__re).index ===__string.lastIndexOf("0"). Actual: ' + __string.match(__re).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(__re)[mi] !== __matches[mi]) {
+    throw new Test262Error('#3.' + mi + ': __string.match(__re)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(__re)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T11.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T11.js
new file mode 100644
index 0000000000..12d441ea85
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T11.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T11
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/. Last match is
+    undefined.  And regular expression object have property lastIndex
+    = tested_string.lastIndexOf("0")+1
+---*/
+
+var __string = "Boston, MA 02134";
+
+var __matches = ["02134", "02134", undefined];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/;
+
+__re.lastIndex = __string.lastIndexOf("0") + 1;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== 3) {
+  throw new Test262Error('#1: __string.match(__re).length=== 3. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(__re).index !== __string.lastIndexOf("0")) {
+  throw new Test262Error('#2: __string.match(__re).index ===__string.lastIndexOf("0"). Actual: ' + __string.match(__re).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(__re)[mi] !== __matches[mi]) {
+    throw new Test262Error('#3.' + mi + ': __string.match(__re)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(__re)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T12.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T12.js
new file mode 100644
index 0000000000..8211a34394
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T12.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T12
+description: >
+    Regular expression is variable that have value /([\d]{5})([-\
+    ]?[\d]{4})?$/g
+---*/
+
+var __matches = ["02134"];
+
+var __string = "Boston, MA 02134";
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/g;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== __matches.length) {
+  throw new Test262Error('#1: __string.match(__re).length=== __matches.length. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(__re)[0] !== __matches[0]) {
+  throw new Test262Error('#2: __string.match(__re)[0]===__matches[0]. Actual: ' + __string.match(__re)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T13.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T13.js
new file mode 100644
index 0000000000..b7f7053dd3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T13.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T13
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/g.  And regular
+    expression object have property lastIndex = 0
+---*/
+
+var __matches = ["02134"];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/g;
+__re.lastIndex = 0;
+
+var __string = "Boston, MA 02134";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== __matches.length) {
+  throw new Test262Error('#1: __string.match(__re).length=== __matches.length. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__string.match(__re)[0] !== __matches[0]) {
+  throw new Test262Error('#3: __string.match(__re)[0]===__matches[0]. Actual: ' + __string.match(__re)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T14.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T14.js
new file mode 100644
index 0000000000..6f25e2a095
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T14.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T14
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/g.  And regular
+    expression object have property lastIndex = tested_string.length
+---*/
+
+var __string = "Boston, MA 02134";
+
+var __matches = ["02134"];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/g;
+
+__re.lastIndex = __string.length;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== __matches.length) {
+  throw new Test262Error('#1: __string.match(__re).length=== __matches.length. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__string.match(__re)[0] !== __matches[0]) {
+  throw new Test262Error('#3: __string.match(__re)[0]===__matches[0]. Actual: ' + __string.match(__re)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T15.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T15.js
new file mode 100644
index 0000000000..8d4b698a0d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T15.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T15
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/.  And regular
+    expression object have property lastIndex =
+    tested_string.lastIndexOf("0")
+---*/
+
+var __string = "Boston, MA 02134";
+
+var __matches = ["02134"];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/g;
+
+__re.lastIndex = __string.lastIndexOf("0");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== __matches.length) {
+  throw new Test262Error('#1: __string.match(__re).length=== __matches.length. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__string.match(__re)[0] !== __matches[0]) {
+  throw new Test262Error('#3: __string.match(__re)[0]===__matches[0]. Actual: ' + __string.match(__re)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T16.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T16.js
new file mode 100644
index 0000000000..6f681db068
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T16.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T16
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/.  And regular
+    expression object have property lastIndex =
+    tested_string.lastIndexOf("0")+1
+---*/
+
+var __string = "Boston, MA 02134";
+
+var __matches = ["02134"];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/g;
+
+__re.lastIndex = __string.lastIndexOf("0") + 1;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== __matches.length) {
+  throw new Test262Error('#1: __string.match(__re).length=== __matches.length. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__string.match(__re)[0] !== __matches[0]) {
+  throw new Test262Error('#3: __string.match(__re)[0]===__matches[0]. Actual: ' + __string.match(__re)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T17.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T17.js
new file mode 100644
index 0000000000..d7b517ee21
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T17.js
@@ -0,0 +1,50 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T17
+description: Regular expression is /0./
+---*/
+
+var __re = /0./;
+
+var __num = 10203040506070809000;
+
+Number.prototype.match = String.prototype.match;
+
+//__matches = ["02"];
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__num.match(__re)[0] !== "02") {
+  throw new Test262Error('#1: __num.match(__re)[0]=== "02". Actual: ' + __num.match(__re)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__num.match(__re).length !== 1) {
+  throw new Test262Error('#2: __num.match(__re).length ===1. Actual: ' + __num.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__num.match(__re).index !== 1) {
+  throw new Test262Error('#3: __num.match(__re).index ===1. Actual: ' + __num.match(__re).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__num.match(__re).input !== String(__num)) {
+  throw new Test262Error('#4: __num.match(__re).input ===String(__num). Actual: ' + __num.match(__re).input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T18.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T18.js
new file mode 100644
index 0000000000..72c25da54e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T18.js
@@ -0,0 +1,52 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T18
+description: >
+    Regular expression is /0./.  And regular expression object have
+    property lastIndex = 0
+---*/
+
+var __re = /0./;
+
+__re.lastIndex = 0;
+
+var __num = 10203040506070809000;
+
+Number.prototype.match = String.prototype.match;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__num.match(__re)[0] !== "02") {
+  throw new Test262Error('#1: __num.match(__re)[0]=== "02". Actual: ' + __num.match(__re)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__num.match(__re).length !== 1) {
+  throw new Test262Error('#2: __num.match(__re).length ===1. Actual: ' + __num.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__num.match(__re).index !== 1) {
+  throw new Test262Error('#3: __num.match(__re).index ===1. Actual: ' + __num.match(__re).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__num.match(__re).input !== String(__num)) {
+  throw new Test262Error('#4: __num.match(__re).input ===String(__num). Actual: ' + __num.match(__re).input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T2.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T2.js
new file mode 100644
index 0000000000..d9b7f16203
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T2.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T2
+description: Regular expression is /34/g
+---*/
+
+var __matches = ["34", "34", "34"];
+
+var __string = "343443444";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(/34/g).length !== 3) {
+  throw new Test262Error('#1: __string = "343443444"; __string.match(/34/g).length=== 3. Actual: ' + __string.match(/34/g).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(/34/g)[mi] !== __matches[mi]) {
+    throw new Test262Error('#2.' + mi + ': __matches=["34","34","34"]; __string = "343443444"; __string.match(/34/g)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(/34/g)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T3.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T3.js
new file mode 100644
index 0000000000..9401095f72
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T3.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T3
+description: Regular expression is /\d{1}/g
+---*/
+
+var __matches = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"];
+
+var __string = "123456abcde7890";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(/\d{1}/g).length !== 10) {
+  throw new Test262Error('#1: __string = "123456abcde7890"; __string.match(/\\d{1}/g).length=== 10. Actual: ' + __string.match(/\d{1}/g).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(/\d{1}/g)[mi] !== __matches[mi]) {
+    throw new Test262Error('#2.' + mi + ': __matches=["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]; __string = "123456abcde7890"; __string.match(/\\d{1}/g)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(/\d{1}/g)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T4.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T4.js
new file mode 100644
index 0000000000..d13b2e87c5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T4.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T4
+description: Regular expression is /\d{2}/g
+---*/
+
+var __matches = ["12", "34", "56", "78", "90"];
+
+var __string = "123456abcde7890";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(/\d{2}/g).length !== 5) {
+  throw new Test262Error('#1: __string = "123456abcde7890"; __string.match(/\\d{2}/g).length=== 5. Actual: ' + __string.match(/\d{2}/g).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(/\d{2}/g)[mi] !== __matches[mi]) {
+    throw new Test262Error('#2.' + mi + ': __matches=["12", "34", "56", "78", "90"]; __string = "123456abcde7890"; __string.match(/\\d{2}/g)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(/\d{2}/g)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T5.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T5.js
new file mode 100644
index 0000000000..50285dd9b2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T5.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T5
+description: Regular expression is /\D{2}/g
+---*/
+
+var __matches = ["ab", "cd"];
+
+var __string = "123456abcde7890";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(/\D{2}/g).length !== 2) {
+  throw new Test262Error('#1: __string = "123456abcde7890"; __string.match(/\\D{2}/g).length=== 2. Actual: ' + __string.match(/\D{2}/g).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(/\D{2}/g)[mi] !== __matches[mi]) {
+    throw new Test262Error('#2.' + mi + ': __matches=["ab", "cd"]; __string = "123456abcde7890"; __string.match(/\\D{2}/g)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(/\D{2}/g)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T6.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T6.js
new file mode 100644
index 0000000000..697488c357
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T6.js
@@ -0,0 +1,62 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T6
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/. Last match is
+    void 0
+---*/
+
+var __string = "Boston, Mass. 02134";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/)[0] !== "02134") {
+  throw new Test262Error('#1: __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/)[0]=== "02134". Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/)[1] !== "02134") {
+  throw new Test262Error('#2: __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/)[1]=== "02134". Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/)[1]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/)[2] !== void 0) {
+  throw new Test262Error('#3: __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/)[2]=== void 0. Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/)[2]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/).length !== 3) {
+  throw new Test262Error('#4: __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/).length ===3. Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#5
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/).index !== 14) {
+  throw new Test262Error('#5: __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/).index ===14. Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#6
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/).input !== __string) {
+  throw new Test262Error('#6: __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/).input ===__string. Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/).input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T7.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T7.js
new file mode 100644
index 0000000000..8798673c31
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T7.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T7
+description: Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/g
+---*/
+
+var __matches = ["02134"];
+
+var __string = "Boston, Mass. 02134";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/g).length !== 1) {
+  throw new Test262Error('#1: __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/g).length=== 1. Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/g).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(/([\d]{5})([-\ ]?[\d]{4})?$/g)[0] !== __matches[0]) {
+  throw new Test262Error('#2: __matches=["02134"]; __string = "Boston, Mass. 02134"; __string.match(/([\\d]{5})([-\\ ]?[\\d]{4})?$/g)[0]===__matches[0]. Actual: ' + __string.match(/([\d]{5})([-\ ]?[\d]{4})?$/g)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T8.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T8.js
new file mode 100644
index 0000000000..c86d92b66f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T8.js
@@ -0,0 +1,46 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T8
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/. Last match is
+    undefined.  And regular expression object have property lastIndex
+    = 0
+---*/
+
+var __matches = ["02134", "02134", undefined];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/;
+__re.lastIndex = 0;
+
+var __string = "Boston, MA 02134";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== 3) {
+  throw new Test262Error('#1: __string = "Boston, MA 02134"; __re = /([\d]{5})([-\ ]?[\d]{4})?$/; __string.match(__re).length=== 3. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(__re).index !== __string.lastIndexOf("0")) {
+  throw new Test262Error('#2: __string = "Boston, MA 02134"; __re = /([\d]{5})([-\ ]?[\d]{4})?$/; __re.lastIndex = 0; __string.match(__re).index ===__string.lastIndexOf("0"). Actual: ' + __string.match(__re).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(__re)[mi] !== __matches[mi]) {
+    throw new Test262Error('#3.' + mi + ': __string = "Boston, MA 02134"; __re = /([\d]{5})([-\ ]?[\d]{4})?$/; __matches=["02134", "02134", undefined]; __string.match(__re)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(__re)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T9.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T9.js
new file mode 100644
index 0000000000..c8060a22c8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A2_T9.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: match returns array as specified in 15.10.6.2
+es5id: 15.5.4.10_A2_T9
+description: >
+    Regular expression is /([\d]{5})([-\ ]?[\d]{4})?$/. Last match is
+    undefined.  And regular expression object have property lastIndex
+    = tested_string.length
+---*/
+
+var __string = "Boston, MA 02134";
+
+var __matches = ["02134", "02134", undefined];
+
+var __re = /([\d]{5})([-\ ]?[\d]{4})?$/;
+
+__re.lastIndex = __string.length;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.match(__re).length !== 3) {
+  throw new Test262Error('#1: __string = "Boston, MA 02134"; __re = /([\d]{5})([-\ ]?[\d]{4})?$/; __string.match(__re).length=== 3. Actual: ' + __string.match(__re).length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__string.match(__re).index !== __string.lastIndexOf("0")) {
+  throw new Test262Error('#2: __string = "Boston, MA 02134"; __re = /([\d]{5})([-\ ]?[\d]{4})?$/; __re.lastIndex = __string.length; __string.match(__re).index ===__string.lastIndexOf("0"). Actual: ' + __string.match(__re).index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var mi = 0; mi < __matches.length; mi++) {
+  if (__string.match(__re)[mi] !== __matches[mi]) {
+    throw new Test262Error('#3.' + mi + ': __string = "Boston, MA 02134"; __re = /([\d]{5})([-\ ]?[\d]{4})?$/; __matches=["02134", "02134", undefined]; __string.match(__re)[' + mi + ']===__matches[' + mi + ']. Actual: ' + __string.match(__re)[mi]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A6.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A6.js
new file mode 100644
index 0000000000..aadafa396e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match has not prototype property
+es5id: 15.5.4.10_A6
+description: Checking String.prototype.match.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.match.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.match.prototype === undefined. Actual: ' + String.prototype.match.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A7.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A7.js
new file mode 100644
index 0000000000..7380da230d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match can't be used as constructor
+es5id: 15.5.4.10_A7
+description: Checking if creating "String.prototype.match object" fails
+---*/
+
+var __FACTORY = String.prototype.match;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.match; __FACTORY = String.prototype.match; __instance = new __FACTORY lead to throwing exception');
+} catch (e) {
+  if (e instanceof Test262Error) throw e;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A8.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A8.js
new file mode 100644
index 0000000000..d632dfd429
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.match.length property has the attribute DontEnum
+es5id: 15.5.4.10_A8
+description: >
+    Checking if enumerating the String.prototype.match.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.match.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.match.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.match.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.match.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.match.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.match) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.match){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A9.js b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A9.js
new file mode 100644
index 0000000000..12c86a3a1f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/S15.5.4.10_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.match.length property does not have the attribute
+    DontDelete
+es5id: 15.5.4.10_A9
+description: >
+    Checking if deleting the String.prototype.match.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.match.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.match.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.match.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.match.length) {
+  throw new Test262Error('#1: delete String.prototype.match.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.match.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.match.length; String.prototype.match.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.match.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/browser.js b/js/src/tests/test262/built-ins/String/prototype/match/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-get-err.js b/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-get-err.js
new file mode 100644
index 0000000000..e750a05018
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-get-err.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Behavior when error is thrown accessing @@match property
+es6id: 21.1.3.11
+info: |
+    [...]
+    3. If regexp is neither undefined nor null, then
+       a. Let matcher be GetMethod(regexp, @@match).
+       b. ReturnIfAbrupt(matcher).
+features: [Symbol.match]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, Symbol.match, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.match(obj);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-invocation.js b/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-invocation.js
new file mode 100644
index 0000000000..3e18b8f9eb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-invocation.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Invocation of @@match property of user-supplied objects
+es6id: 21.1.3.11
+info: |
+    [...]
+    3. If regexp is neither undefined nor null, then
+       a. Let matcher be GetMethod(regexp, @@match).
+       b. ReturnIfAbrupt(matcher).
+       c. If matcher is not undefined, then
+          i. Return Call(matcher, regexp, «O»).
+features: [Symbol.match]
+---*/
+
+var obj = {};
+var returnVal = {};
+var callCount = 0;
+var thisVal, args;
+
+obj[Symbol.match] = function() {
+  callCount += 1;
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+assert.sameValue(''.match(obj), returnVal);
+assert.sameValue(callCount, 1, 'Invokes the method exactly once');
+assert.sameValue(thisVal, obj);
+assert.notSameValue(args, undefined);
+assert.sameValue(args.length, 1);
+assert.sameValue(args[0], '');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-is-null.js b/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-is-null.js
new file mode 100644
index 0000000000..96a2f9b3d6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/cstm-matcher-is-null.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.match
+description: >
+  If regexp's Symbol.match property is null, no error is thrown.
+info: |
+  String.prototype.match ( regexp )
+
+  [...]
+  2. If regexp is neither undefined nor null, then
+    a. Let matcher be ? GetMethod(regexp, @@match).
+    b. If matcher is not undefined, then
+      [...]
+  [...]
+  5. Return ? Invoke(rx, @@match, « S »).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+features: [Symbol.match]
+---*/
+
+var regexp = {};
+regexp[Symbol.match] = null;
+regexp.toString = function() { return "\\d"; };
+regexp.valueOf = function() { throw new Test262Error("should not be called"); };
+
+assert.sameValue("abc".match(regexp), null);
+assert.sameValue("ab3c".match(regexp)[0], "3");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/duplicate-named-groups-properties.js b/js/src/tests/test262/built-ins/String/prototype/match/duplicate-named-groups-properties.js
new file mode 100644
index 0000000000..5cf6bb7691
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/duplicate-named-groups-properties.js
@@ -0,0 +1,39 @@
+// |reftest| skip -- regexp-duplicate-named-groups is not supported
+// Copyright 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Properties on groups object with duplicate named capture groups
+esid: prod-GroupSpecifier
+features: [regexp-duplicate-named-groups]
+includes: [compareArray.js]
+---*/
+
+const matcher = /(?:(?<x>a)|(?<y>a)(?<x>b))(?:(?<z>c)|(?<z>d))/;
+
+const threeMatchResult = "abc".match(matcher);
+assert.sameValue(threeMatchResult.groups.x, "b", "group x matches b");
+assert.sameValue(threeMatchResult.groups.y, "a", "group y matches a");
+assert.sameValue(threeMatchResult.groups.z, "c", "group z matches c");
+assert.compareArray(
+  Object.keys(threeMatchResult.groups),
+  ["x", "y", "z"],
+  "Properties of groups are ordered in RegExp source order despite y matching before x in this alternative"
+);
+
+const twoMatchResult = "ad".match(matcher);
+assert.sameValue(twoMatchResult.groups.x, "a", "group x matches a");
+assert.sameValue(twoMatchResult.groups.y, undefined, "group y does not match");
+assert.sameValue(twoMatchResult.groups.z, "d", "group z matches d");
+assert.compareArray(
+  Object.keys(twoMatchResult.groups),
+  ["x", "y", "z"],
+  "y is still present on groups object, in the right order, despite not matching"
+);
+
+const iteratedMatcher = /(?:(?:(?<x>a)|(?<x>b)|c)\k<x>){2}/;
+
+const matchedInPrevIterationResult = "aac".match(iteratedMatcher);
+assert.sameValue(matchedInPrevIterationResult.groups.x, undefined, "group x does not match in the last iteration");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/duplicate-named-indices-groups-properties.js b/js/src/tests/test262/built-ins/String/prototype/match/duplicate-named-indices-groups-properties.js
new file mode 100644
index 0000000000..2548e693a3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/duplicate-named-indices-groups-properties.js
@@ -0,0 +1,39 @@
+// |reftest| skip -- regexp-duplicate-named-groups is not supported
+// Copyright 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Properties on indices.groups object with duplicate named capture groups
+esid: prod-GroupSpecifier
+features: [regexp-duplicate-named-groups, regexp-match-indices]
+includes: [compareArray.js]
+---*/
+
+const matcher = /(?:(?<x>a)|(?<y>a)(?<x>b))(?:(?<z>c)|(?<z>d))/d;
+
+const threeMatchResult = "abc".match(matcher);
+assert.compareArray(threeMatchResult.indices.groups.x, [1, 2], "group x matches b");
+assert.compareArray(threeMatchResult.indices.groups.y, [0, 1], "group y matches a");
+assert.compareArray(threeMatchResult.indices.groups.z, [2, 3], "group z matches c");
+assert.compareArray(
+  Object.keys(threeMatchResult.indices.groups),
+  ["x", "y", "z"],
+  "Properties of groups are ordered in RegExp source order despite y matching before x in this alternative"
+);
+
+const twoMatchResult = "ad".match(matcher);
+assert.compareArray(twoMatchResult.indices.groups.x, [0, 1], "group x matches a");
+assert.sameValue(twoMatchResult.indices.groups.y, undefined, "group y does not match");
+assert.compareArray(twoMatchResult.indices.groups.z, [1, 2], "group z matches d");
+assert.compareArray(
+  Object.keys(twoMatchResult.indices.groups),
+  ["x", "y", "z"],
+  "y is still present on groups object, in the right order, despite not matching"
+);
+
+const iteratedMatcher = /(?:(?:(?<x>a)|(?<x>b)|c)\k<x>){2}/d;
+
+const matchedInPrevIterationResult = "aac".match(iteratedMatcher);
+assert.sameValue(matchedInPrevIterationResult.indices.groups.x, undefined, "group x does not match in the last iteration");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/invoke-builtin-match.js b/js/src/tests/test262/built-ins/String/prototype/match/invoke-builtin-match.js
new file mode 100644
index 0000000000..f33db66deb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/invoke-builtin-match.js
@@ -0,0 +1,39 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Invocation of @@match property of internally-created RegExps
+es6id: 21.1.3.11
+info: |
+    [...]
+    6. Let rx be RegExpCreate(regexp, undefined) (see 21.2.3.2.3).
+    7. ReturnIfAbrupt(rx).
+    8. Return Invoke(rx, @@match, «S»).
+features: [Symbol.match]
+---*/
+
+var originalMatch = RegExp.prototype[Symbol.match];
+var returnVal = {};
+var result, thisVal, args;
+
+RegExp.prototype[Symbol.match] = function() {
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+try {
+  result = 'target'.match('string source');
+
+  assert(thisVal instanceof RegExp);
+  assert.sameValue(thisVal.source, 'string source');
+  assert.sameValue(thisVal.flags, '');
+  assert.sameValue(thisVal.lastIndex, 0);
+  assert.sameValue(args.length, 1);
+  assert.sameValue(args[0], 'target');
+  assert.sameValue(result, returnVal);
+} finally {
+  RegExp.prototype[Symbol.match] = originalMatch;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/length.js b/js/src/tests/test262/built-ins/String/prototype/match/length.js
new file mode 100644
index 0000000000..d3ab6c5320
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/length.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.10_A11
+es6id: 21.1.3.11
+description: Checking String.prototype.match.length
+info: |
+    The length property of the match method is 1.
+
+    ES6 Section 17:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this value
+    is equal to the largest number of named arguments shown in the subclause
+    headings for the function description, including optional parameters.
+
+    [...]
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.match.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.match.hasOwnProperty("length") return true. Actual: ' + String.prototype.match.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.match.length !== 1) {
+  throw new Test262Error('#2: String.prototype.match.length === 1. Actual: ' + String.prototype.match.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+verifyNotEnumerable(String.prototype.match, 'length');
+verifyNotWritable(String.prototype.match, 'length');
+verifyConfigurable(String.prototype.match, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/name.js b/js/src/tests/test262/built-ins/String/prototype/match/name.js
new file mode 100644
index 0000000000..09c3133348
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.11
+description: >
+  String.prototype.match.name is "match".
+info: |
+  String.prototype.match ( regexp )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.match.name, "match");
+
+verifyNotEnumerable(String.prototype.match, "name");
+verifyNotWritable(String.prototype.match, "name");
+verifyConfigurable(String.prototype.match, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/match/not-a-constructor.js
new file mode 100644
index 0000000000..91f5ec5a8e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.match does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.match),
+  false,
+  'isConstructor(String.prototype.match) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.match();
+}, '`new String.prototype.match()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/shell.js b/js/src/tests/test262/built-ins/String/prototype/match/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/this-val-bool.js b/js/src/tests/test262/built-ins/String/prototype/match/this-val-bool.js
new file mode 100644
index 0000000000..251d574705
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/this-val-bool.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T2
+description: >
+    Argument is function that return boolean, and instance is Boolean
+    object
+---*/
+
+var __instance = new Boolean;
+
+__instance.match = String.prototype.match;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.match(function() {
+    return false;
+  }())[0] !== "false") {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.match = String.prototype.match;  __instance.match(function(){return false;}())[0] === "false". Actual: ' + __instance.match(function() {
+    return false;
+  }())[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/this-val-obj.js b/js/src/tests/test262/built-ins/String/prototype/match/this-val-obj.js
new file mode 100644
index 0000000000..aa217a541f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/this-val-obj.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.match (regexp)
+es5id: 15.5.4.10_A1_T1
+description: Arguments is true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.match = String.prototype.match;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.match(true)[0] !== "true") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.match = String.prototype.match;  __instance.match(true)[0] === "true". Actual: ' + __instance.match(true)[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/match/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/match/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..7e7d0d64ca
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/match/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.match
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var match = String.prototype.match;
+
+assert.sameValue(typeof match, 'function');
+
+assert.throws(TypeError, function() {
+  match.call(undefined, /./);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  match.call(null, /./);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/browser.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/flags-nonglobal-throws.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/flags-nonglobal-throws.js
new file mode 100644
index 0000000000..c134e85870
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/flags-nonglobal-throws.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2019 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Re-throws errors when calling @@matchAll
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If _regexp_ is neither *undefined* nor *null*, then
+             1. Let _isRegExp_ be ? IsRegExp(_regexp_).
+             1. If _isRegExp_ is true, then
+               1. Let _flags_ be ? Get(_regexp_, *"flags"*).
+               1. Perform ? RequireObjectCoercible(_flags_).
+               1. If ? ToString(_flags_) does not contain *"g"*, throw a *TypeError* exception.
+features: [Symbol.matchAll]
+---*/
+
+
+assert.throws(TypeError, function () {
+  ''.matchAll(/a/);
+});
+assert.throws(TypeError, function () {
+  ''.matchAll(/a/i);
+});
+assert.throws(TypeError, function () {
+  ''.matchAll(/a/m);
+});
+assert.throws(TypeError, function () {
+  ''.matchAll(/a/u);
+});
+assert.throws(TypeError, function () {
+  ''.matchAll(/a/y);
+});
+
+var regex = /a/;
+Object.defineProperty(regex, 'flags', {
+  value: 'muyi'
+});
+
+assert.throws(TypeError, function () {
+  ''.matchAll(regex);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/flags-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/flags-undefined-throws.js
new file mode 100644
index 0000000000..9c6928c719
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/flags-undefined-throws.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2019 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Re-throws errors when calling @@matchAll
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If _regexp_ is neither *undefined* nor *null*, then
+             1. Let _isRegExp_ be ? IsRegExp(_regexp_).
+             1. If _isRegExp_ is true, then
+               1. Let _flags_ be ? Get(_regexp_, *"flags"*).
+               1. Perform ? RequireObjectCoercible(_flags_).
+               1. If ? ToString(_flags_) does not contain *"g"*, throw a *TypeError* exception.
+features: [Symbol.matchAll]
+---*/
+
+var regex = /a/g;
+Object.defineProperty(regex, 'flags', { value: undefined });
+
+assert.throws(TypeError, function () {
+  ''.matchAll(regex);
+});
+
+Object.defineProperty(RegExp.prototype, 'flags', {
+  get: function () {
+    return undefined;
+  }
+});
+
+assert.throws(TypeError, function () {
+  ''.matchAll(/a/g);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/length.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/length.js
new file mode 100644
index 0000000000..49fc24912e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/length.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2018 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: String.prototype.matchAll `length` property
+info: |
+  17 ECMAScript Standard Built-in Objects:
+
+    [...]
+
+    Every built-in function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description. Optional parameters
+    (which are indicated with brackets: [ ]) or rest parameters (which
+    are shown using the form «...name») are not included in the default
+    argument count.
+
+    Unless otherwise specified, the length property of a built-in function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [String.prototype.matchAll]
+---*/
+
+assert.sameValue(String.prototype.matchAll.length, 1);
+
+verifyNotEnumerable(String.prototype.matchAll, 'length');
+verifyNotWritable(String.prototype.matchAll, 'length');
+verifyConfigurable(String.prototype.matchAll, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/name.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/name.js
new file mode 100644
index 0000000000..efab01207f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/name.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2018 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: String.prototype.matchAll `name` property
+info: |
+  17 ECMAScript Standard Built-in Objects:
+
+    [...]
+
+    Every built-in function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    [...]
+
+    Unless otherwise specified, the name property of a built-in function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [String.prototype.matchAll]
+---*/
+
+assert.sameValue(String.prototype.matchAll.name, 'matchAll');
+
+verifyNotEnumerable(String.prototype.matchAll, 'name');
+verifyNotWritable(String.prototype.matchAll, 'name');
+verifyConfigurable(String.prototype.matchAll, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/not-a-constructor.js
new file mode 100644
index 0000000000..e4a6ba973c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.matchAll does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, String.prototype.matchAll, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.matchAll),
+  false,
+  'isConstructor(String.prototype.matchAll) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.matchAll();
+}, '`new String.prototype.matchAll()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/prop-desc.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/prop-desc.js
new file mode 100644
index 0000000000..4354fc6ae6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/prop-desc.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2018 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: String.prototype.matchAll property descriptor
+info: |
+  17 ECMAScript Standard Built-in Objects:
+
+    [...]
+
+    Every other data property described in clauses 18 through 26 and in Annex
+    B.2 has the attributes { [[Writable]]: true, [[Enumerable]]: false,
+    [[Configurable]]: true } unless otherwise specified.
+includes: [propertyHelper.js]
+features: [String.prototype.matchAll]
+---*/
+
+assert.sameValue(typeof String.prototype.matchAll, 'function');
+
+verifyNotEnumerable(String.prototype, 'matchAll');
+verifyWritable(String.prototype, 'matchAll');
+verifyConfigurable(String.prototype, 'matchAll');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-get-matchAll-throws.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-get-matchAll-throws.js
new file mode 100644
index 0000000000..ebab7328b5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-get-matchAll-throws.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Re-throws errors when calling @@matchAll
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        i. Return ? Call(matcher, regexp, « O »).
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+var regexp = /./g;
+Object.defineProperty(regexp, Symbol.matchAll, {
+  get() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.matchAll(regexp);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-null.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-null.js
new file mode 100644
index 0000000000..0244014e4c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-null.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Behavior when regexp is null
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be ? RequireObjectCoercible(this value).
+    2. If regexp is neither undefined nor null, then
+      [...]
+    3. Let S be ? ToString(O).
+    4. Let rx be ? RegExpCreate(R, "g").
+    5. Return ? Invoke(rx, @@matchAll, « S »).
+features: [String.prototype.matchAll]
+includes: [compareArray.js, compareIterator.js, regExpUtils.js]
+---*/
+
+var str = '-null-';
+
+assert.compareIterator(str.matchAll(null), [
+  matchValidator(['null'], 1, str)
+]);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-undefined-or-null-invokes-matchAll.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-undefined-or-null-invokes-matchAll.js
new file mode 100644
index 0000000000..17a08e3282
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-undefined-or-null-invokes-matchAll.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Behavior when regexp is null or undefined
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be ? RequireObjectCoercible(this value).
+    2. If regexp is neither undefined nor null, then
+      [...]
+    3. Let S be ? ToString(O).
+    4. Let rx be ? RegExpCreate(R, "g").
+    5. Return ? Invoke(rx, @@matchAll, « S »).
+features: [String.prototype.matchAll]
+---*/
+
+var callCount = 0;
+var obj = {};
+RegExp.prototype[Symbol.matchAll] = function() {
+  callCount++;
+  return obj;
+};
+
+assert.sameValue('a'.matchAll(null), obj);
+assert.sameValue(callCount, 1);
+
+assert.sameValue(''.matchAll(undefined), obj);
+assert.sameValue(callCount, 2);
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-undefined.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-undefined.js
new file mode 100644
index 0000000000..255c0d5a09
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-is-undefined.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Behavior when regexp is null
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be ? RequireObjectCoercible(this value).
+    2. If regexp is neither undefined nor null, then
+      [...]
+    3. Return ? MatchAllIterator(regexp, O).
+
+  MatchAllIterator( regexp, O )
+    [...]
+    2. If ? IsRegExp(regexp) is true, then
+      [...]
+    3. Else,
+      a. Let R be RegExpCreate(regexp, "g").
+features: [String.prototype.matchAll]
+includes: [compareArray.js, compareIterator.js, regExpUtils.js]
+---*/
+
+var str = 'a';
+
+assert.compareIterator(str.matchAll(undefined), [
+  matchValidator([''], 0, str),
+  matchValidator([''], 1, str)
+]);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-invocation.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-invocation.js
new file mode 100644
index 0000000000..0246337834
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-invocation.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2018 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Invocation of @@matchAll property of user-supplied RegExp objects
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        i. Return ? Call(matcher, regexp, « O »).
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+var obj = {};
+var returnVal = {};
+var callCount = 0;
+var thisVal, args;
+
+obj[Symbol.matchAll] = function () {
+  callCount++;
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+var str = '';
+
+assert.sameValue(str.matchAll(obj), returnVal);
+assert.sameValue(callCount, 1, 'Invokes the method exactly once');
+assert.sameValue(thisVal, obj);
+assert.notSameValue(args, undefined);
+assert.sameValue(args.length, 1);
+assert.sameValue(args[0], str);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-is-undefined-or-null.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-is-undefined-or-null.js
new file mode 100644
index 0000000000..ae29ed7feb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-is-undefined-or-null.js
@@ -0,0 +1,40 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Behavior when regexp[@@matchAll] is undefined or null
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be ? RequireObjectCoercible(this value).
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        [...]
+    3. Let S be ? ToString(O).
+    4. Let rx be ? RegExpCreate(R, "g").
+    5. Return ? Invoke(rx, @@matchAll, « S »).
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+var regexp = /./g;
+var callCount = 0;
+var arg;
+var obj = {};
+var str = 'abc';
+RegExp.prototype[Symbol.matchAll] = function(string) {
+  arg = string;
+  callCount++;
+  return obj;
+};
+
+regexp[Symbol.matchAll] = undefined;
+assert.sameValue(str.matchAll(regexp), obj);
+assert.sameValue(arg, str);
+assert.sameValue(callCount, 1);
+
+regexp[Symbol.matchAll] = null;
+assert.sameValue(str.matchAll(regexp), obj);
+assert.sameValue(arg, str);
+assert.sameValue(callCount, 2);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-not-callable.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-not-callable.js
new file mode 100644
index 0000000000..647b38fb66
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-not-callable.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Behavior when regexp[@@matchAll] is not callable
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+assert.sameValue(typeof String.prototype.matchAll, "function");
+
+var regexp = /./;
+
+regexp[Symbol.matchAll] = true;
+assert.throws(TypeError, function() {
+  ''.matchAll(regexp);
+});
+
+regexp[Symbol.matchAll] = 5;
+assert.throws(TypeError, function() {
+  ''.matchAll(regexp);
+});
+
+regexp[Symbol.matchAll] = '';
+assert.throws(TypeError, function() {
+  ''.matchAll(regexp);
+});
+
+regexp[Symbol.matchAll] = Symbol();
+assert.throws(TypeError, function() {
+  ''.matchAll(regexp);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-throws.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-throws.js
new file mode 100644
index 0000000000..343aaddfbb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-matchAll-throws.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Re-throws errors when calling @@matchAll
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+var regexp = /./g;
+regexp[Symbol.matchAll] = function() {
+  throw new Test262Error();
+};
+
+assert.throws(Test262Error, function() {
+  ''.matchAll(regexp);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-get-matchAll-throws.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-get-matchAll-throws.js
new file mode 100644
index 0000000000..dbad3f4b1d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-get-matchAll-throws.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Re-throws errors thrown while accessing RegExp's @@matchAll property
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+features: [Symbol.matchAll]
+---*/
+
+Object.defineProperty(RegExp.prototype, Symbol.matchAll, {
+  get() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.matchAll(/./g);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-has-no-matchAll.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-has-no-matchAll.js
new file mode 100644
index 0000000000..bd1d5fd466
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-has-no-matchAll.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Behavior when @@matchAll is removed from RegExp's prototype
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be ? RequireObjectCoercible(this value).
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        [...]
+    [...]
+    4. Let rx be ? RegExpCreate(R, "g").
+    5. Return ? Invoke(rx, @@matchAll, « S »).
+
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+assert.sameValue(typeof String.prototype.matchAll, "function");
+
+delete RegExp.prototype[Symbol.matchAll];
+var str = '/a/g*/b/g';
+
+assert.throws(TypeError, function() {
+  str.matchAll(/\w/g);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-invocation.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-invocation.js
new file mode 100644
index 0000000000..0da71822e4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-invocation.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2018 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Behavior when invoking of @@matchAll
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        i. Return ? Call(matcher, regexp, « O »).
+features: [Symbol.matchAll]
+---*/
+
+var obj = {};
+var returnVal = {};
+var callCount = 0;
+var thisVal, args;
+
+RegExp.prototype[Symbol.matchAll] = function() {
+  callCount++;
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+var regexp = /./g;
+var str = '';
+
+assert.sameValue(str.matchAll(regexp), returnVal);
+assert.sameValue(callCount, 1, 'Invokes the method exactly once');
+assert.sameValue(thisVal, regexp);
+assert.notSameValue(args, undefined);
+assert.sameValue(args.length, 1);
+assert.sameValue(args[0], str);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-throws.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-throws.js
new file mode 100644
index 0000000000..febeeb440c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/regexp-prototype-matchAll-throws.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Re-throws errors when calling @@matchAll
+info: |
+  String.prototype.matchAll ( regexp )
+    [...]
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        i. Return ? Call(matcher, regexp, « O »).
+features: [Symbol.matchAll]
+---*/
+
+RegExp.prototype[Symbol.matchAll] = function() {
+  throw new Test262Error();
+};
+
+assert.throws(Test262Error, function() {
+  ''.matchAll(/./g);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/shell.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/shell.js
new file mode 100644
index 0000000000..b2377bc5bc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/shell.js
@@ -0,0 +1,150 @@
+// GENERATED, DO NOT EDIT
+// file: compareIterator.js
+// Copyright (C) 2018 Peter Wong.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: Compare the values of an iterator with an array of expected values
+defines: [assert.compareIterator]
+---*/
+
+// Example:
+//
+//    function* numbers() {
+//      yield 1;
+//      yield 2;
+//      yield 3;
+//    }
+//
+//    assert.compareIterator(numbers(), [
+//      v => assert.sameValue(v, 1),
+//      v => assert.sameValue(v, 2),
+//      v => assert.sameValue(v, 3),
+//    ]);
+//
+assert.compareIterator = function(iter, validators, message) {
+  message = message || '';
+
+  var i, result;
+  for (i = 0; i < validators.length; i++) {
+    result = iter.next();
+    assert(!result.done, 'Expected ' + i + ' values(s). Instead iterator only produced ' + (i - 1) + ' value(s). ' + message);
+    validators[i](result.value);
+  }
+
+  result = iter.next();
+  assert(result.done, 'Expected only ' + i + ' values(s). Instead iterator produced more. ' + message);
+  assert.sameValue(result.value, undefined, 'Expected value of `undefined` when iterator completes. ' + message);
+}
+
+// file: regExpUtils.js
+// Copyright (C) 2017 Mathias Bynens.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    Collection of functions used to assert the correctness of RegExp objects.
+defines: [buildString, testPropertyEscapes, testPropertyOfStrings, testExtendedCharacterClass, matchValidator]
+---*/
+
+function buildString(args) {
+  // Use member expressions rather than destructuring `args` for improved
+  // compatibility with engines that only implement assignment patterns
+  // partially or not at all.
+  const loneCodePoints = args.loneCodePoints;
+  const ranges = args.ranges;
+  const CHUNK_SIZE = 10000;
+  let result = Reflect.apply(String.fromCodePoint, null, loneCodePoints);
+  for (let i = 0; i < ranges.length; i++) {
+    const range = ranges[i];
+    const start = range[0];
+    const end = range[1];
+    const codePoints = [];
+    for (let length = 0, codePoint = start; codePoint <= end; codePoint++) {
+      codePoints[length++] = codePoint;
+      if (length === CHUNK_SIZE) {
+        result += Reflect.apply(String.fromCodePoint, null, codePoints);
+        codePoints.length = length = 0;
+      }
+    }
+    result += Reflect.apply(String.fromCodePoint, null, codePoints);
+  }
+  return result;
+}
+
+function printCodePoint(codePoint) {
+  const hex = codePoint
+    .toString(16)
+    .toUpperCase()
+    .padStart(6, "0");
+  return `U+${hex}`;
+}
+
+function printStringCodePoints(string) {
+  const buf = [];
+  for (const symbol of string) {
+    const formatted = printCodePoint(symbol.codePointAt(0));
+    buf.push(formatted);
+  }
+  return buf.join(' ');
+}
+
+function testPropertyEscapes(regExp, string, expression) {
+  if (!regExp.test(string)) {
+    for (const symbol of string) {
+      const hex = printCodePoint(symbol.codePointAt(0));
+      assert(
+        regExp.test(symbol),
+        `\`${ expression }\` should match U+${ hex } (\`${ symbol }\`)`
+      );
+    }
+  }
+}
+
+function testPropertyOfStrings(args) {
+  // Use member expressions rather than destructuring `args` for improved
+  // compatibility with engines that only implement assignment patterns
+  // partially or not at all.
+  const regExp = args.regExp;
+  const expression = args.expression;
+  const matchStrings = args.matchStrings;
+  const nonMatchStrings = args.nonMatchStrings;
+  const allStrings = matchStrings.join('');
+  if (!regExp.test(allStrings)) {
+    for (const string of matchStrings) {
+      assert(
+        regExp.test(string),
+        `\`${ expression }\` should match ${ string } (U+${ printStringCodePoints(string) })`
+      );
+    }
+  }
+
+  const allNonMatchStrings = nonMatchStrings.join('');
+  if (regExp.test(allNonMatchStrings)) {
+    for (const string of nonMatchStrings) {
+      assert(
+        !regExp.test(string),
+        `\`${ expression }\` should not match ${ string } (U+${ printStringCodePoints(string) })`
+      );
+    }
+  }
+}
+
+// The exact same logic can be used to test extended character classes
+// as enabled through the RegExp `v` flag. This is useful to test not
+// just standalone properties of strings, but also string literals, and
+// set operations.
+const testExtendedCharacterClass = testPropertyOfStrings;
+
+// Returns a function that validates a RegExp match result.
+//
+// Example:
+//
+//    var validate = matchValidator(['b'], 1, 'abc');
+//    validate(/b/.exec('abc'));
+//
+function matchValidator(expectedEntries, expectedIndex, expectedInput) {
+  return function(match) {
+    assert.compareArray(match, expectedEntries, 'Match entries');
+    assert.sameValue(match.index, expectedIndex, 'Match index');
+    assert.sameValue(match.input, expectedInput, 'Match input');
+  }
+}
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/this-val-non-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/this-val-non-obj-coercible.js
new file mode 100644
index 0000000000..6e214fc416
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/this-val-non-obj-coercible.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2018 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: The `this` value cannot be coerced into an object
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be RequireObjectCoercible(this value).
+features: [String.prototype.matchAll]
+---*/
+
+var matchAll = String.prototype.matchAll;
+
+assert.sameValue(typeof matchAll, 'function');
+
+assert.throws(TypeError, function() {
+  matchAll.call(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  matchAll.call(null);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/matchAll/toString-this-val.js b/js/src/tests/test262/built-ins/String/prototype/matchAll/toString-this-val.js
new file mode 100644
index 0000000000..6652e29f06
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/matchAll/toString-this-val.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: |
+  Verify ToString is called when regexp[@@matchAll] is undefined or null
+info: |
+  String.prototype.matchAll ( regexp )
+    1. Let O be ? RequireObjectCoercible(this value).
+    2. If regexp is neither undefined nor null, then
+      a. Let matcher be ? GetMethod(regexp, @@matchAll).
+      b. If matcher is not undefined, then
+        [...]
+    3. Let S be ? ToString(O).
+    4. Let rx be ? RegExpCreate(R, "g").
+    5. Return ? Invoke(rx, @@matchAll, « S »).
+features: [Symbol.matchAll, String.prototype.matchAll]
+---*/
+
+var regexp = /./;
+var callCount = 0;
+var arg;
+var obj = {};
+var toStringResult = 'abc';
+var receiver = {
+  [Symbol.toPrimitive]: function() {
+    callCount++;
+    return toStringResult;
+  }
+};
+RegExp.prototype[Symbol.matchAll] = function(string) {
+  arg = string;
+};
+
+String.prototype.matchAll.call(receiver, null);
+assert.sameValue(callCount, 1);
+assert.sameValue(arg, toStringResult);
+
+String.prototype.matchAll.call(receiver, undefined);
+assert.sameValue(callCount, 2);
+assert.sameValue(arg, toStringResult);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/browser.js b/js/src/tests/test262/built-ins/String/prototype/normalize/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/form-is-not-valid-throws.js b/js/src/tests/test262/built-ins/String/prototype/normalize/form-is-not-valid-throws.js
new file mode 100644
index 0000000000..85db8ba768
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/form-is-not-valid-throws.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Throws a RangeError if ToString(form) value is not a valid form name.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  ...
+  7. If f is not one of "NFC", "NFD", "NFKC", or "NFKD", throw a RangeError
+  exception.
+---*/
+
+assert.throws(RangeError, function() {
+  'foo'.normalize('bar');
+});
+
+assert.throws(RangeError, function() {
+  'foo'.normalize('NFC1');
+});
+
+assert.throws(RangeError, function() {
+  'foo'.normalize(null);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/length.js b/js/src/tests/test262/built-ins/String/prototype/normalize/length.js
new file mode 100644
index 0000000000..f95c97046e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/length.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  String.prototype.normalize.length value and descriptor.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.normalize.length, 0,
+  'The value of `String.prototype.normalize.length` is `0`'
+);
+
+verifyNotEnumerable(String.prototype.normalize, 'length');
+verifyNotWritable(String.prototype.normalize, 'length');
+verifyConfigurable(String.prototype.normalize, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/name.js b/js/src/tests/test262/built-ins/String/prototype/normalize/name.js
new file mode 100644
index 0000000000..e3d3ef3acc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/name.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  String.prototype.normalize.name value and descriptor.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.normalize.name, 'normalize',
+  'The value of `String.prototype.normalize.name` is `"normalize"`'
+);
+
+verifyNotEnumerable(String.prototype.normalize, 'name');
+verifyNotWritable(String.prototype.normalize, 'name');
+verifyConfigurable(String.prototype.normalize, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/normalize.js b/js/src/tests/test262/built-ins/String/prototype/normalize/normalize.js
new file mode 100644
index 0000000000..4304be9bbf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/normalize.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Property type and descriptor.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.normalize,
+  'function',
+  '`typeof String.prototype.normalize` is `function`'
+);
+
+verifyNotEnumerable(String.prototype, 'normalize');
+verifyWritable(String.prototype, 'normalize');
+verifyConfigurable(String.prototype, 'normalize');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/normalize/not-a-constructor.js
new file mode 100644
index 0000000000..e1c16b4e10
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.normalize does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.normalize),
+  false,
+  'isConstructor(String.prototype.normalize) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.normalize();
+}, '`new String.prototype.normalize()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-form-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-form-as-symbol.js
new file mode 100644
index 0000000000..b8e6a56ec8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-form-as-symbol.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Returns abrupt from ToString(form) as a Symbol.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  ...
+  4. If form is not provided or form is undefined, let form be "NFC".
+  5. Let f be ToString(form).
+  6. ReturnIfAbrupt(f).
+features: [Symbol]
+---*/
+
+var s = Symbol('foo');
+
+assert.throws(TypeError, function() {
+  'foo'.normalize(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-form.js b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-form.js
new file mode 100644
index 0000000000..907bc55a05
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-form.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Returns abrupt from ToString(form)
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  ...
+  4. If form is not provided or form is undefined, let form be "NFC".
+  5. Let f be ToString(form).
+  6. ReturnIfAbrupt(f).
+---*/
+
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  'foo'.normalize(o);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-this-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-this-as-symbol.js
new file mode 100644
index 0000000000..67004180bc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-this-as-symbol.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Returns abrupt from ToString(this) where this is a Symbol
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+features: [Symbol]
+---*/
+
+var s = Symbol('foo');
+
+assert.throws(TypeError, function() {
+  String.prototype.normalize.call(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-this.js
new file mode 100644
index 0000000000..217a13754b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/return-abrupt-from-this.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Returns abrupt from ToString(this)
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+---*/
+
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.normalize.call(o);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string-from-coerced-form.js b/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string-from-coerced-form.js
new file mode 100644
index 0000000000..63c4f5a3c4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string-from-coerced-form.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Returns normalized string from coerced form.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  ...
+  4. If form is not provided or form is undefined, let form be "NFC".
+  5. Let f be ToString(form).
+  6. ReturnIfAbrupt(f).
+  7. If f is not one of "NFC", "NFD", "NFKC", or "NFKD", throw a RangeError
+  exception.
+  8. Let ns be the String value that is the result of normalizing S into the
+  normalization form named by f as specified in
+  http://www.unicode.org/reports/tr15/tr15-29.html.
+  9. Return ns.
+---*/
+
+var s = '\u00C5\u2ADC\u0958\u2126\u0344';
+var nfc = '\xC5\u2ADD\u0338\u0915\u093C\u03A9\u0308\u0301';
+var nfd = 'A\u030A\u2ADD\u0338\u0915\u093C\u03A9\u0308\u0301';
+var o = {
+  toString: function() {
+    return 'NFC';
+  }
+};
+
+assert.sameValue(s.normalize(['NFC']), nfc, 'coerced array - NFC');
+assert.sameValue(s.normalize(o), nfc, 'coerced object - NFC');
+
+o = {
+  toString: function() {
+    return 'NFD';
+  }
+};
+
+assert.sameValue(s.normalize(['NFD']), nfd, 'coerced array - NFD');
+assert.sameValue(s.normalize(o), nfd, 'coerced object - NFD');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string-using-default-parameter.js b/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string-using-default-parameter.js
new file mode 100644
index 0000000000..06219727ba
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string-using-default-parameter.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Returns normalized string.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  ...
+  4. If form is not provided or form is undefined, let form be "NFC".
+  ...
+  8. Let ns be the String value that is the result of normalizing S into the
+  normalization form named by f as specified in
+  http://www.unicode.org/reports/tr15/tr15-29.html.
+  9. Return ns.
+---*/
+
+var s = '\u00C5\u2ADC\u0958\u2126\u0344';
+var nfc = '\xC5\u2ADD\u0338\u0915\u093C\u03A9\u0308\u0301';
+
+assert.sameValue(s.normalize(), nfc, 'Use NFC as the default form');
+assert.sameValue(s.normalize(undefined), nfc, 'Use NFC as the default form');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string.js b/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string.js
new file mode 100644
index 0000000000..d7caf14ea7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/return-normalized-string.js
@@ -0,0 +1,50 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Returns normalized string.
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  ...
+  7. If f is not one of "NFC", "NFD", "NFKC", or "NFKD", throw a RangeError
+  exception.
+  8. Let ns be the String value that is the result of normalizing S into the
+  normalization form named by f as specified in
+  http://www.unicode.org/reports/tr15/tr15-29.html.
+  9. Return ns.
+---*/
+
+var s = '\u1E9B\u0323';
+
+assert.sameValue(s.normalize('NFC'), '\u1E9B\u0323', 'Normalized on NFC');
+assert.sameValue(s.normalize('NFD'), '\u017F\u0323\u0307', 'Normalized on NFD');
+assert.sameValue(s.normalize('NFKC'), '\u1E69', 'Normalized on NFKC');
+assert.sameValue(s.normalize('NFKD'), '\u0073\u0323\u0307', 'Normalized on NFKD');
+
+assert.sameValue(
+  '\u00C5\u2ADC\u0958\u2126\u0344'.normalize('NFC'),
+  '\xC5\u2ADD\u0338\u0915\u093C\u03A9\u0308\u0301',
+  'Normalized on NFC'
+);
+
+assert.sameValue(
+  '\u00C5\u2ADC\u0958\u2126\u0344'.normalize('NFD'),
+  'A\u030A\u2ADD\u0338\u0915\u093C\u03A9\u0308\u0301',
+  'Normalized on NFD'
+);
+
+assert.sameValue(
+  '\u00C5\u2ADC\u0958\u2126\u0344'.normalize('NFKC'),
+  '\xC5\u2ADD\u0338\u0915\u093C\u03A9\u0308\u0301',
+  'Normalized on NFKC'
+);
+
+assert.sameValue(
+  '\u00C5\u2ADC\u0958\u2126\u0344'.normalize('NFKD'),
+  'A\u030A\u2ADD\u0338\u0915\u093C\u03A9\u0308\u0301',
+  'Normalized on NFKD'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/shell.js b/js/src/tests/test262/built-ins/String/prototype/normalize/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/this-is-null-throws.js b/js/src/tests/test262/built-ins/String/prototype/normalize/this-is-null-throws.js
new file mode 100644
index 0000000000..899eec94fd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/this-is-null-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Throws TypeError when `this` is null
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.normalize.call(null);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/normalize/this-is-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/normalize/this-is-undefined-throws.js
new file mode 100644
index 0000000000..41ef7ba087
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/normalize/this-is-undefined-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.12
+description: >
+  Throws TypeError when `this` is undefined
+info: |
+  21.1.3.12 String.prototype.normalize ( [ form ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.normalize.call(undefined);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/browser.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-fill-string-symbol.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-fill-string-symbol.js
new file mode 100644
index 0000000000..37b9eb63ce
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-fill-string-symbol.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should fail if given a Symbol fillString.
+author: Jordan Harband
+features: [Symbol]
+---*/
+
+assert.throws(TypeError, function() {
+  'abc'.padEnd(10, Symbol());
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-not-object-coercible.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-not-object-coercible.js
new file mode 100644
index 0000000000..ba7c08faf1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-not-object-coercible.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: >
+  String#padEnd should fail if given a null or undefined value,
+  or an object not coercible to a string.
+author: Jordan Harband
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.padEnd.call(null);
+});
+
+assert.throws(TypeError, function() {
+  String.prototype.padEnd.call(undefined);
+});
+
+var notCoercible = {
+  toString: function() {
+    throw new Test262Error('attempted toString');
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.padEnd.call(notCoercible);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-symbol.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-symbol.js
new file mode 100644
index 0000000000..deac35a8b7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/exception-symbol.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should fail if given a Symbol receiver.
+author: Jordan Harband
+features: [Symbol]
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.padEnd.call(Symbol());
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-empty.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-empty.js
new file mode 100644
index 0000000000..e22ee5a185
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-empty.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: >
+  String#padEnd should return the string unchanged when
+  an explicit empty string is provided
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padEnd(5, ''), 'abc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-non-strings.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-non-strings.js
new file mode 100644
index 0000000000..76bbe749ce
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-non-strings.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should stringify a non-string fillString value
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padEnd(10, false), 'abcfalsefa');
+assert.sameValue('abc'.padEnd(10, true), 'abctruetru');
+assert.sameValue('abc'.padEnd(10, null), 'abcnullnul');
+assert.sameValue('abc'.padEnd(10, 0), 'abc0000000');
+assert.sameValue('abc'.padEnd(10, -0), 'abc0000000');
+assert.sameValue('abc'.padEnd(10, NaN), 'abcNaNNaNN');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-omitted.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-omitted.js
new file mode 100644
index 0000000000..f0a6c475dc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/fill-string-omitted.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should default to a fillString of " " when omitted
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padEnd(5), 'abc  ');
+assert.sameValue('abc'.padEnd(5, undefined), 'abc  ');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/function-length.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/function-length.js
new file mode 100644
index 0000000000..4b38c5a4a4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/function-length.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should have length 1
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.padEnd.length, 1, 'Expected String#padEnd.length to be 1');
+
+verifyNotEnumerable(String.prototype.padEnd, 'length');
+verifyNotWritable(String.prototype.padEnd, 'length');
+verifyConfigurable(String.prototype.padEnd, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/function-name.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/function-name.js
new file mode 100644
index 0000000000..cf0c201497
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/function-name.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should have name property with value 'padEnd'
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.padEnd.name,
+  'padEnd',
+  'Expected String#padEnd.name to be "padEnd"'
+);
+
+verifyNotEnumerable(String.prototype.padEnd, 'name');
+verifyNotWritable(String.prototype.padEnd, 'name');
+verifyConfigurable(String.prototype.padEnd, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/function-property-descriptor.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/function-property-descriptor.js
new file mode 100644
index 0000000000..9dd0ce8aec
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/function-property-descriptor.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should be writable, non-enumerable, and configurable
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+verifyNotEnumerable(String.prototype, 'padEnd');
+verifyWritable(String.prototype, 'padEnd');
+verifyConfigurable(String.prototype, 'padEnd');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/max-length-not-greater-than-string.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/max-length-not-greater-than-string.js
new file mode 100644
index 0000000000..79a4f59169
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/max-length-not-greater-than-string.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: >
+  String#padEnd should return the string unchanged when an integer max
+  length is not greater than the string length
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padEnd(undefined, 'def'), 'abc');
+assert.sameValue('abc'.padEnd(null, 'def'), 'abc');
+assert.sameValue('abc'.padEnd(NaN, 'def'), 'abc');
+assert.sameValue('abc'.padEnd(-Infinity, 'def'), 'abc');
+assert.sameValue('abc'.padEnd(0, 'def'), 'abc');
+assert.sameValue('abc'.padEnd(-1, 'def'), 'abc');
+assert.sameValue('abc'.padEnd(3, 'def'), 'abc');
+assert.sameValue('abc'.padEnd(3.9999, 'def'), 'abc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/normal-operation.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/normal-operation.js
new file mode 100644
index 0000000000..0b5b1023da
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/normal-operation.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should work in the general case
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padEnd(7, 'def'), 'abcdefd');
+assert.sameValue('abc'.padEnd(5, '*'), 'abc**');
+
+// surrogate pairs
+assert.sameValue('abc'.padEnd(6, '\uD83D\uDCA9'), 'abc\uD83D\uDCA9\uD83D');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/not-a-constructor.js
new file mode 100644
index 0000000000..ed5f84458c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.padEnd does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.padEnd),
+  false,
+  'isConstructor(String.prototype.padEnd) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.padEnd();
+}, '`new String.prototype.padEnd()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/observable-operations.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/observable-operations.js
new file mode 100644
index 0000000000..6af105ca4b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/observable-operations.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padend
+description: String#padEnd should perform observable operations in the correct order
+author: Jordan Harband
+---*/
+
+var log = "";
+
+function createPrimitiveObserver(name, string, value) {
+  return {
+    toString: function() {
+      log += '|toString:' + name;
+      return string;
+    },
+    valueOf: function() {
+      log += '|valueOf:' + name;
+      return value;
+    }
+  };
+};
+
+var receiver = createPrimitiveObserver('receiver', {}, 'abc');
+
+var fillString = createPrimitiveObserver('fillString', {}, 'def');
+
+var maxLength = createPrimitiveObserver('maxLength', 11, {});
+
+var result = String.prototype.padEnd.call(receiver, maxLength, fillString);
+
+assert.sameValue(result, 'abcdefdefde');
+
+assert.sameValue(log, '|' + [
+  'toString:receiver',
+  'valueOf:receiver',
+  'valueOf:maxLength',
+  'toString:maxLength',
+  'toString:fillString',
+  'valueOf:fillString'
+].join('|'), log);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padEnd/shell.js b/js/src/tests/test262/built-ins/String/prototype/padEnd/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padEnd/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/browser.js b/js/src/tests/test262/built-ins/String/prototype/padStart/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/exception-fill-string-symbol.js b/js/src/tests/test262/built-ins/String/prototype/padStart/exception-fill-string-symbol.js
new file mode 100644
index 0000000000..95d085bd77
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/exception-fill-string-symbol.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should fail if given a Symbol fillString.
+author: Jordan Harband
+features: [Symbol]
+---*/
+
+assert.throws(TypeError, function() {
+  'abc'.padStart(10, Symbol());
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/exception-not-object-coercible.js b/js/src/tests/test262/built-ins/String/prototype/padStart/exception-not-object-coercible.js
new file mode 100644
index 0000000000..c690928c09
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/exception-not-object-coercible.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: >
+  String#padStart should fail if given a null or undefined value,
+  or an object not coercible to a string.
+author: Jordan Harband
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.padStart.call(null);
+});
+
+assert.throws(TypeError, function() {
+  String.prototype.padStart.call(undefined);
+});
+
+var notCoercible = {
+  toString: function() {
+    throw new Test262Error('attempted toString');
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.padStart.call(notCoercible);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/exception-symbol.js b/js/src/tests/test262/built-ins/String/prototype/padStart/exception-symbol.js
new file mode 100644
index 0000000000..0c9de71626
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/exception-symbol.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should fail if given a Symbol receiver.
+author: Jordan Harband
+features: [Symbol]
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.padStart.call(Symbol());
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-empty.js b/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-empty.js
new file mode 100644
index 0000000000..5d73afac3a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-empty.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: >
+  String#padStart should return the string unchanged when
+  an explicit empty string is provided
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padStart(5, ''), 'abc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-non-strings.js b/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-non-strings.js
new file mode 100644
index 0000000000..cd1f0edc82
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-non-strings.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should stringify a non-string fillString value
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padStart(10, false), 'falsefaabc');
+assert.sameValue('abc'.padStart(10, true), 'truetruabc');
+assert.sameValue('abc'.padStart(10, null), 'nullnulabc');
+assert.sameValue('abc'.padStart(10, 0), '0000000abc');
+assert.sameValue('abc'.padStart(10, -0), '0000000abc');
+assert.sameValue('abc'.padStart(10, NaN), 'NaNNaNNabc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-omitted.js b/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-omitted.js
new file mode 100644
index 0000000000..13a20abf32
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/fill-string-omitted.js
@@ -0,0 +1,13 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should default to a fillString of " " when omitted
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padStart(5), '  abc');
+assert.sameValue('abc'.padStart(5, undefined), '  abc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/function-length.js b/js/src/tests/test262/built-ins/String/prototype/padStart/function-length.js
new file mode 100644
index 0000000000..056e797a01
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/function-length.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should have length 1
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.padStart.length, 1, 'Expected String#padStart.length to be 1');
+
+verifyNotEnumerable(String.prototype.padStart, 'length');
+verifyNotWritable(String.prototype.padStart, 'length');
+verifyConfigurable(String.prototype.padStart, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/function-name.js b/js/src/tests/test262/built-ins/String/prototype/padStart/function-name.js
new file mode 100644
index 0000000000..f7fb59889b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/function-name.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should have name property with value 'padStart'
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.padStart.name,
+  'padStart',
+  'Expected String#padStart.name to be "padStart"'
+);
+
+verifyNotEnumerable(String.prototype.padStart, 'name');
+verifyNotWritable(String.prototype.padStart, 'name');
+verifyConfigurable(String.prototype.padStart, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/function-property-descriptor.js b/js/src/tests/test262/built-ins/String/prototype/padStart/function-property-descriptor.js
new file mode 100644
index 0000000000..b49c71a64c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/function-property-descriptor.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should be writable, non-enumerable, and configurable
+author: Jordan Harband
+includes: [propertyHelper.js]
+---*/
+
+verifyNotEnumerable(String.prototype, 'padStart');
+verifyWritable(String.prototype, 'padStart');
+verifyConfigurable(String.prototype, 'padStart');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/max-length-not-greater-than-string.js b/js/src/tests/test262/built-ins/String/prototype/padStart/max-length-not-greater-than-string.js
new file mode 100644
index 0000000000..44476ecad0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/max-length-not-greater-than-string.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: >
+  String#padStart should return the string unchanged when an integer max
+  length is not greater than the string length
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padStart(undefined, 'def'), 'abc');
+assert.sameValue('abc'.padStart(null, 'def'), 'abc');
+assert.sameValue('abc'.padStart(NaN, 'def'), 'abc');
+assert.sameValue('abc'.padStart(-Infinity, 'def'), 'abc');
+assert.sameValue('abc'.padStart(0, 'def'), 'abc');
+assert.sameValue('abc'.padStart(-1, 'def'), 'abc');
+assert.sameValue('abc'.padStart(3, 'def'), 'abc');
+assert.sameValue('abc'.padStart(3.9999, 'def'), 'abc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/normal-operation.js b/js/src/tests/test262/built-ins/String/prototype/padStart/normal-operation.js
new file mode 100644
index 0000000000..c18a0f58cb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/normal-operation.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should work in the general case
+author: Jordan Harband
+---*/
+
+assert.sameValue('abc'.padStart(7, 'def'), 'defdabc');
+assert.sameValue('abc'.padStart(5, '*'), '**abc');
+
+// surrogate pairs
+assert.sameValue('abc'.padStart(6, '\uD83D\uDCA9'), '\uD83D\uDCA9\uD83Dabc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/padStart/not-a-constructor.js
new file mode 100644
index 0000000000..22ae62b3b1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.padStart does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.padStart),
+  false,
+  'isConstructor(String.prototype.padStart) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.padStart();
+}, '`new String.prototype.padStart()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/observable-operations.js b/js/src/tests/test262/built-ins/String/prototype/padStart/observable-operations.js
new file mode 100644
index 0000000000..470d53fdfd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/observable-operations.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2016 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.padstart
+description: String#padStart should perform observable operations in the correct order
+author: Jordan Harband
+---*/
+
+var log = "";
+
+function createPrimitiveObserver(name, string, value) {
+  return {
+    toString: function() {
+      log += '|toString:' + name;
+      return string;
+    },
+    valueOf: function() {
+      log += '|valueOf:' + name;
+      return value;
+    }
+  };
+};
+
+var receiver = createPrimitiveObserver('receiver', {}, 'abc');
+
+var fillString = createPrimitiveObserver('fillString', {}, 'def');
+
+var maxLength = createPrimitiveObserver('maxLength', 11, {});
+
+var result = String.prototype.padStart.call(receiver, maxLength, fillString);
+
+assert.sameValue(result, 'defdefdeabc');
+
+assert.sameValue(log, '|' + [
+  'toString:receiver',
+  'valueOf:receiver',
+  'valueOf:maxLength',
+  'toString:maxLength',
+  'toString:fillString',
+  'valueOf:fillString'
+].join('|'), log);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/padStart/shell.js b/js/src/tests/test262/built-ins/String/prototype/padStart/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/padStart/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/browser.js b/js/src/tests/test262/built-ins/String/prototype/repeat/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/count-coerced-to-zero-returns-empty-string.js b/js/src/tests/test262/built-ins/String/prototype/repeat/count-coerced-to-zero-returns-empty-string.js
new file mode 100644
index 0000000000..574a1731fd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/count-coerced-to-zero-returns-empty-string.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  If ToInteger(count) is zero, returns an empty String.
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  8. Let T be a String value that is made from n copies of S appended together.
+  If n is 0, T is the empty String.
+  9. Return T.
+---*/
+
+var str = 'ES2015';
+
+assert.sameValue(str.repeat(NaN), '', 'str.repeat(NaN) returns ""');
+assert.sameValue(str.repeat(null), '', 'str.repeat(null) returns ""');
+assert.sameValue(str.repeat(undefined), '', 'str.repeat(undefined) returns ""');
+assert.sameValue(str.repeat(false), '', 'str.repeat(false) returns ""');
+assert.sameValue(str.repeat('0'), '', 'str.repeat("0") returns ""');
+assert.sameValue(str.repeat(0.9), '', 'str.repeat(0.9) returns ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/count-is-infinity-throws.js b/js/src/tests/test262/built-ins/String/prototype/repeat/count-is-infinity-throws.js
new file mode 100644
index 0000000000..f8ac8b0eba
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/count-is-infinity-throws.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Throws a RangeError if count < 0
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  7. If n is +∞, throw a RangeError exception.
+---*/
+
+assert.throws(RangeError, function() {
+  ''.repeat(Infinity);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/count-is-zero-returns-empty-string.js b/js/src/tests/test262/built-ins/String/prototype/repeat/count-is-zero-returns-empty-string.js
new file mode 100644
index 0000000000..5a0403b5e7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/count-is-zero-returns-empty-string.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  If count is zero, returns an empty String.
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  8. Let T be a String value that is made from n copies of S appended together.
+  If n is 0, T is the empty String.
+  9. Return T.
+---*/
+
+assert.sameValue('foo'.repeat(0), '');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/count-less-than-zero-throws.js b/js/src/tests/test262/built-ins/String/prototype/repeat/count-less-than-zero-throws.js
new file mode 100644
index 0000000000..3d589395e8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/count-less-than-zero-throws.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Throws a RangeError if count < 0
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  6. If n < 0, throw a RangeError exception.
+---*/
+
+assert.throws(RangeError, function() {
+  ''.repeat(-1);
+});
+
+assert.throws(RangeError, function() {
+  ''.repeat(-Infinity);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/empty-string-returns-empty.js b/js/src/tests/test262/built-ins/String/prototype/repeat/empty-string-returns-empty.js
new file mode 100644
index 0000000000..848bd5417a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/empty-string-returns-empty.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  An empty repeated n times will return an empty string.
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  8. Let T be a String value that is made from n copies of S appended together.
+  If n is 0, T is the empty String.
+  9. Return T.
+---*/
+
+assert.sameValue(''.repeat(1), '', '"".repeat(1)');
+assert.sameValue(''.repeat(3), '', '"".repeat(3)');
+
+var maxSafe32bitInt = 2147483647;
+assert.sameValue(''.repeat(maxSafe32bitInt), '', '"".repeat(maxSafe32bitInt)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/length.js b/js/src/tests/test262/built-ins/String/prototype/repeat/length.js
new file mode 100644
index 0000000000..2151718be9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/length.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  String.prototype.repeat.length value and descriptor.
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.repeat.length, 1,
+  'The value of `String.prototype.repeat.length` is `1`'
+);
+
+verifyNotEnumerable(String.prototype.repeat, 'length');
+verifyNotWritable(String.prototype.repeat, 'length');
+verifyConfigurable(String.prototype.repeat, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/name.js b/js/src/tests/test262/built-ins/String/prototype/repeat/name.js
new file mode 100644
index 0000000000..3c640857de
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/name.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  String.prototype.repeat.name value and descriptor.
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.repeat.name, 'repeat',
+  'The value of `String.prototype.repeat.name` is `"repeat"`'
+);
+
+verifyNotEnumerable(String.prototype.repeat, 'name');
+verifyNotWritable(String.prototype.repeat, 'name');
+verifyConfigurable(String.prototype.repeat, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/repeat/not-a-constructor.js
new file mode 100644
index 0000000000..b8acfb0e7f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.repeat does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.repeat),
+  false,
+  'isConstructor(String.prototype.repeat) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.repeat();
+}, '`new String.prototype.repeat()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/repeat-string-n-times.js b/js/src/tests/test262/built-ins/String/prototype/repeat/repeat-string-n-times.js
new file mode 100644
index 0000000000..3e7905c1b4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/repeat-string-n-times.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Returns a String made from n copies of the original String appended together.
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  8. Let T be a String value that is made from n copies of S appended together.
+  If n is 0, T is the empty String.
+  9. Return T.
+---*/
+
+var str = 'abc';
+assert.sameValue(str.repeat(1), str, 'str.repeat(1) === str');
+assert.sameValue(str.repeat(3), 'abcabcabc', 'str.repeat(3) === "abcabcabc"');
+
+str = '';
+var i = 0;
+var count = 10000;
+
+while (i < count) {
+  str += '.';
+  i++;
+}
+
+assert.sameValue('.'.repeat(count), str);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/repeat.js b/js/src/tests/test262/built-ins/String/prototype/repeat/repeat.js
new file mode 100644
index 0000000000..c6df5c1df3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/repeat.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Property type and descriptor.
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.repeat,
+  'function',
+  '`typeof String.prototype.repeat` is `function`'
+);
+
+verifyNotEnumerable(String.prototype, 'repeat');
+verifyWritable(String.prototype, 'repeat');
+verifyConfigurable(String.prototype, 'repeat');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-count-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-count-as-symbol.js
new file mode 100644
index 0000000000..4f316daa43
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-count-as-symbol.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Returns abrupt from ToInteger(count) where count is a Symbol
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  4. Let n be ToInteger(count).
+  5. ReturnIfAbrupt(n).
+features: [Symbol]
+---*/
+
+var s = Symbol('');
+
+assert.throws(TypeError, function() {
+  ''.repeat(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-count.js b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-count.js
new file mode 100644
index 0000000000..a9e8df8091
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-count.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Returns abrupt from ToInteger(count)
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  4. Let n be ToInteger(count).
+  5. ReturnIfAbrupt(n).
+---*/
+
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+}
+
+assert.throws(Test262Error, function() {
+  ''.repeat(o);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-this-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-this-as-symbol.js
new file mode 100644
index 0000000000..58daa15d23
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-this-as-symbol.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Returns abrupt from ToString(this) where this is a Symbol
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+features: [Symbol]
+---*/
+
+var s = Symbol('');
+
+assert.throws(TypeError, function() {
+  String.prototype.repeat.call(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-this.js
new file mode 100644
index 0000000000..5576d7108c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/return-abrupt-from-this.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Returns abrupt from ToString(this)
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+---*/
+
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.repeat.call(o);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/shell.js b/js/src/tests/test262/built-ins/String/prototype/repeat/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/this-is-null-throws.js b/js/src/tests/test262/built-ins/String/prototype/repeat/this-is-null-throws.js
new file mode 100644
index 0000000000..a93f0e5592
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/this-is-null-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Throws TypeError when `this` is null
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.repeat.call(null);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/repeat/this-is-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/repeat/this-is-undefined-throws.js
new file mode 100644
index 0000000000..0defa229b2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/repeat/this-is-undefined-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.13
+description: >
+  Throws TypeError when `this` is undefined
+info: |
+  21.1.3.13 String.prototype.repeat ( count )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.repeat.call(undefined);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/15.5.4.11-1.js b/js/src/tests/test262/built-ins/String/prototype/replace/15.5.4.11-1.js
new file mode 100644
index 0000000000..e7a7818938
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/15.5.4.11-1.js
@@ -0,0 +1,24 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.11-1
+description: >
+    'this' object used by the replaceValue function of a
+    String.prototype.replace invocation
+flags: [noStrict]
+---*/
+
+var global = this;
+var retVal = 'x'.replace(/x/,
+  function() {
+    if (this === global) {
+      return 'y';
+    } else {
+      return 'z';
+    }
+  });
+
+assert.sameValue(retVal, 'y', 'retVal');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A12.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A12.js
new file mode 100644
index 0000000000..de508e784f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A12.js
@@ -0,0 +1,25 @@
+// Copyright 2011 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Call replaceValue passing undefined as the this value
+es5id: 15.5.4.11_A12
+description: replaceValue tests that its this value is undefined
+flags: [noStrict]
+---*/
+
+var global = this;
+'x'.replace(/x/, function() {
+  "use strict";
+
+  if (this === global) {
+    throw new Test262Error('#1: String replace leaks global');
+  }
+  if (this !== undefined) {
+    throw new Test262Error('#2: replaceValue should be called with this===undefined. ' +
+      'Actual: ' + this);
+  }
+  return 'y';
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T1.js
new file mode 100644
index 0000000000..7d915749b3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T1
+description: Arguments are true and 1, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.replace = String.prototype.replace;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.replace(true, 1) !== "1") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.replace = String.prototype.replace;  __instance.replace(true, 1) === "1". Actual: ' + __instance.replace(true, 1));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T10.js
new file mode 100644
index 0000000000..0b021fa5f9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T10
+description: >
+    Call replace (searchValue, replaceValue) function with object and
+    function arguments of string. Object have overrided toString
+    function
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+};
+
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__obj, function() {
+    return x;
+  }) !== "undefinedBABABAB") {
+  throw new Test262Error('#1: var x; var __obj = {toString:function(){return "\u0041B";}}; var __str = "ABB\u0041BABAB"; replace(__obj, function(){return x;}) === "undefinedBABABAB". Actual: ' + __str.replace(__obj, function() {
+    return x;
+  }));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T11.js
new file mode 100644
index 0000000000..0ec448e985
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T11.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T11
+description: >
+    Call replace (searchValue, replaceValue) function with objects
+    arguments of string object. Objects have overrided toString
+    function, that throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "insearchValue";
+  }
+};
+var __obj2 = {
+  toString: function() {
+    throw "inreplaceValue";
+  }
+};
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.replace(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.replace(__obj,__obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "insearchValue") {
+    throw new Test262Error('#1.1: Exception === "insearchValue". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T12.js
new file mode 100644
index 0000000000..43cd91885f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T12.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T12
+description: >
+    Call replace (searchValue, replaceValue) function with objects
+    arguments of String object.  First objects have overrided toString
+    and valueOf functions, valueOf throw exception.  Second objects
+    have overrided toString function, that throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "insearchValue";
+  }
+};
+var __obj2 = {
+  toString: function() {
+    throw "inreplaceValue";
+  }
+};
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.replace(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.replace(__obj,__obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "insearchValue") {
+    throw new Test262Error('#1.1: Exception === "insearchValue". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T13.js
new file mode 100644
index 0000000000..1a98a4191a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T13.js
@@ -0,0 +1,41 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T13
+description: >
+    Call replace (searchValue, replaceValue) function with objects
+    arguments of string.  First objects have overrided toString and
+    valueOf functions.  Second objects have overrided toString
+    function, that throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return 1;
+  }
+};
+var __obj2 = {
+  toString: function() {
+    throw "inreplaceValue";
+  }
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = "ABB\u0041BABAB\u0031BBAA".replace(__obj, __obj2);
+  throw new Test262Error('#1: var x = "ABB\\u0041BABAB\\u0031BBAA".replace(__obj,__obj2) lead to throwing exception');
+} catch (e) {
+  if (e !== "inreplaceValue") {
+    throw new Test262Error('#1.1: Exception === "inreplaceValue". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T14.js
new file mode 100644
index 0000000000..e34b2fe7e8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T14.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T14
+description: Instance is string, searchValue is regular expression
+---*/
+
+var __reg = new RegExp("77");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("ABB\u0041BABAB\u0037\u0037BBAA".replace(__reg, 1) !== "ABBABABAB\u0031BBAA") {
+  throw new Test262Error('#1: var __reg = new RegExp("77"); "ABB\\u0041BABAB\\u0037\\u0037BBAA".replace(__reg, 1) === "ABBABABAB\\u0031BBAA". Actual: ' + ("ABB\u0041BABAB\u0037\u0037BBAA".replace(__reg, 1)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T15.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T15.js
new file mode 100644
index 0000000000..7f1f20a554
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T15.js
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T15
+description: Instance is Object, searchValue is regular expression
+---*/
+
+var __obj = {
+  toString: function() {
+    return /77/
+  }
+};
+
+var __instance = new Object(1100.00777001);
+
+Object.prototype.replace = String.prototype.replace;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __instance.replace(__obj, 1) === "1100.0017001";
+  throw new Test262Error('#1.0: x = __instance.replace(__obj, 1) === "1100.0017001" lead to throwing exception');
+} catch (e) {
+  if (!(e instanceof TypeError)) {
+    throw new Test262Error('#1.1: Exception is instance of TypeError. Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T16.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T16.js
new file mode 100644
index 0000000000..f38a86b388
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T16.js
@@ -0,0 +1,39 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T16
+description: Instance is Number, searchValue is regular expression
+---*/
+
+var __re = /77/;
+
+var __instance = new Number(1100.00777001);
+
+Number.prototype.replace = String.prototype.replace;
+
+var __obj = {
+  toString: function() {
+    return function(a1, a2, a3) {
+      return a2 + "z"
+    };
+  }
+}
+//__obj = function(a1,a2,a3){return a2+"z"};
+
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __instance.replace(__re, __obj) === "1100.007z7001";
+  throw new Test262Error('#1.0: x = __instance.replace(__obj, 1) === "1100.007z7001" lead to throwing exception');
+} catch (e) {
+  if (!(e instanceof TypeError)) {
+    throw new Test262Error('#1.1: Exception is instance of TypeError. Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T17.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T17.js
new file mode 100644
index 0000000000..2a74db7349
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T17.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T17
+description: Instance is String object, searchValue is regular expression
+---*/
+
+var __re = new RegExp(x, "g");
+
+var __instance = String("asdf");
+
+var __str = "1";
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.replace(__re, __str) !== "1a1s1d1f1") {
+  throw new Test262Error('#1: var x; var __re = new RegExp(x,"g"); __instance = String("asdf"); __str = "1"; __instance.replace(__re, __str) === "1a1s1d1f1". Actual: ' + __instance.replace(__re, __str));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T2.js
new file mode 100644
index 0000000000..7273ab9c74
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T2.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T2
+description: >
+    Argument is function that return boolean, and instance is Boolean
+    object
+---*/
+
+var __instance = new Boolean;
+
+__instance.replace = String.prototype.replace;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.replace(function() {
+    return false;
+  }(), x) !== "undefined") {
+  throw new Test262Error('#1: var x; __instance = new Boolean; __instance.replace = String.prototype.replace;  __instance.replace(function(){return false;}(),x) === "undefined". Actual: ' + __instance.replace(function() {
+    return false;
+  }(), x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T4.js
new file mode 100644
index 0000000000..e21689c161
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T4.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T4
+description: >
+    Call replace (searchValue, replaceValue) function with null and
+    function(a1,a2,a3){return a2+"";} arguments of function object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (function() {
+    return "gnulluna"
+  }().replace(null, function(a1, a2, a3) {
+    return a2 + "";
+  }) !== "g1una") {
+  throw new Test262Error('#1: function(){return "gnulluna"}().replace(null,function(a1,a2,a3){return a2+"";}) === "g1una". Actual: ' + function() {
+    return "gnulluna"
+  }().replace(null, function(a1, a2, a3) {
+    return a2 + "";
+  }));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T5.js
new file mode 100644
index 0000000000..4d7aa0f7ef
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T5.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T5
+description: >
+    Call replace (searchValue, replaceValue) function with null and
+    Function() arguments of function object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (function() {
+    return "gnulluna"
+  }().replace(null, Function()) !== "gundefineduna") {
+  throw new Test262Error('#1: function(){return "gnulluna"}().replace(null, Function()) === "gundefineduna". Actual: ' + function() {
+    return "gnulluna"
+  }().replace(null, Function()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T6.js
new file mode 100644
index 0000000000..d5ce769257
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T6
+description: >
+    Call replace (searchValue, replaceValue) function with x and
+    Function("return arguments[1]+42;") arguments of new String
+    object. x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (new String("undefined").replace(x, Function("return arguments[1]+42;")) !== "42") {
+  throw new Test262Error('#1: var x; new String("undefined").replace(x,Function("return arguments[1]+42;")) === "42". Actual: ' + new String("undefined").replace(x, Function("return arguments[1]+42;")));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T7.js
new file mode 100644
index 0000000000..a5071d2fdf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T7
+description: >
+    Call replace (searchValue, replaceValue) function with string and
+    undefined arguments of String object
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String(void 0).replace("e", undefined) !== "undundefinedfined") {
+  throw new Test262Error('#1: String(void 0).replace("e",undefined) === "undundefinedfined". Actual: ' + String(void 0).replace("e", undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T8.js
new file mode 100644
index 0000000000..c8749a3d73
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T8.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T8
+description: >
+    Call replace (searchValue, replaceValue) function with regular
+    expression and void 0 arguments of String object
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String(__obj).replace(/e/g, void 0) !== "undundefinedfinundefinedd") {
+  throw new Test262Error('#1: __obj = {toString:function(){}}; String(__obj).replace(/e/g,void 0) === "undundefinedfinundefinedd". Actual: ' + String(__obj).replace(/e/g, void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T9.js
new file mode 100644
index 0000000000..cfa8895ebe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A1_T9.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace (searchValue, replaceValue)
+es5id: 15.5.4.11_A1_T9
+description: >
+    Call replace (searchValue, replaceValue) function with functions
+    arguments of new String object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (new String(__obj).replace(function() {}(), __func) !== "undefined0undefined") {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; function __func(a1,a2,a3){return a1+a2+a3;}; new String(__obj).replace(function(){}(),__func) === "undefined0undefined". Actual: ' + new String(__obj).replace(function() {}(), __func));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __func(a1, a2, a3) {
+  return a1 + a2 + a3;
+};
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T1.js
new file mode 100644
index 0000000000..4e617aa030
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T1.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T1
+description: >
+    Don`t use $ in replaceValue, searchValue is regular expression
+    /sh/g
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/g;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, 'sch') !== 'She sells seaschells by the seaschore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/g; __str.replace(__re,\'sch\')===\'She sells seaschells by the seaschore.\'. Actual: ' + __str.replace(__re, 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T10.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T10.js
new file mode 100644
index 0000000000..c1edeff76c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T10.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T10
+description: Use $' in replaceValue, searchValue is regular expression /sh/
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$'" + 'sch') !== 'She sells seaells by the seashore.schells by the seashore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/; __str.replace(__re, "$\'" + \'sch\')===\'She sells seaells by the seashore.schells by the seashore.\'. Actual: ' + __str.replace(__re, "$'" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T2.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T2.js
new file mode 100644
index 0000000000..276487a71e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T2.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T2
+description: Use $$ in replaceValue, searchValue is regular expression /sh/g
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/g;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$$" + 'sch') !== 'She sells sea$schells by the sea$schore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/g; __str.replace(__re,"$$" + \'sch\')===\'She sells sea$schells by the sea$schore.\'. Actual: ' + __str.replace(__re, "$$" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T3.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T3.js
new file mode 100644
index 0000000000..89c8a6a111
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T3.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T3
+description: Use $& in replaceValue, searchValue is regular expression /sh/g
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/g;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$&" + 'sch') !== 'She sells seashschells by the seashschore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/g; __str.replace(__re,"$&" + \'sch\')===\'She sells seashschells by the seashschore.\'. Actual: ' + __str.replace(__re, "$&" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T4.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T4.js
new file mode 100644
index 0000000000..b019004f21
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T4.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T4
+description: Use $` in replaceValue, searchValue is regular expression /sh/g
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/g;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$`" + 'sch') !== 'She sells seaShe sells seaschells by the seaShe sells seashells by the seaschore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/g; __str.replace(__re, "$`" + \'sch\')===\'She sells seaShe sells seaschells by the seaShe sells seashells by the seaschore.\'. Actual: ' + __str.replace(__re, "$`" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T5.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T5.js
new file mode 100644
index 0000000000..2c4cf32b97
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T5
+description: Use $' in replaceValue, searchValue is regular expression /sh/g
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/g;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$'" + 'sch') !== 'She sells seaells by the seashore.schells by the seaore.schore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/g; __str.replace(__re, "$\'" + \'sch\')===\'She sells seaells by the seashore.schells by the seaore.schore.\'. Actual: ' + __str.replace(__re, "$'" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T6.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T6.js
new file mode 100644
index 0000000000..668ae4a876
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T6
+description: Don`t use $ in replaceValue, searchValue is regular expression /sh/
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, 'sch') !== 'She sells seaschells by the seashore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/; __str.replace(__re, \'sch\')===\'She sells seaschells by the seashore.\'. Actual: ' + __str.replace(__re, 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T7.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T7.js
new file mode 100644
index 0000000000..7d50ab0f8b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T7.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T7
+description: Use $$ in replaceValue, searchValue is regular expression /sh/
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$$" + 'sch') !== 'She sells sea$schells by the seashore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/; __str.replace(__re, "$$" + \'sch\')===\'She sells sea$schells by the seashore.\'. Actual: ' + __str.replace(__re, "$$" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T8.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T8.js
new file mode 100644
index 0000000000..f2611147b1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T8.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T8
+description: Use $& in replaceValue, searchValue is regular expression /sh/
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$&" + 'sch') !== 'She sells seashschells by the seashore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/; __str.replace(__re, "$&" + \'sch\')===\'She sells seashschells by the seashore.\'. Actual: ' + __str.replace(__re, "$&" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T9.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T9.js
new file mode 100644
index 0000000000..839d8f02fe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A2_T9.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The $ replacements are done left-to-right, and, once such are placement is performed, the new
+    replacement text is not subject to further replacements
+es5id: 15.5.4.11_A2_T9
+description: Use $` in replaceValue, searchValue is regular expression /sh/
+---*/
+
+var __str = 'She sells seashells by the seashore.';
+var __re = /sh/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$`" + 'sch') !== 'She sells seaShe sells seaschells by the seashore.') {
+  throw new Test262Error('#1: var __str = \'She sells seashells by the seashore.\'; var __re = /sh/; __str.replace(__re, "$`" + \'sch\')===\'She sells seaShe sells seaschells by the seashore.\'. Actual: ' + __str.replace(__re, "$`" + 'sch'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T1.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T1.js
new file mode 100644
index 0000000000..56a378494c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T1.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: replace with regexp /(uid=)(\d+)/ returns
+es5id: 15.5.4.11_A3_T1
+description: replaceValue is "$11" + 15
+---*/
+
+var __str = 'uid=31';
+var __re = /(uid=)(\d+)/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$11" + 15) !== 'uid=115') {
+  throw new Test262Error('#1: var __str = \'uid=31\'; var __re = /(uid=)(\d+)/; __str.replace(__re, "$11" + 15)===\'uid=115\'. Actual: ' + __str.replace(__re, "$11" + 15));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T2.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T2.js
new file mode 100644
index 0000000000..0eb7fd3d83
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T2.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: replace with regexp /(uid=)(\d+)/ returns
+es5id: 15.5.4.11_A3_T2
+description: replaceValue is "$11" + '15'
+---*/
+
+var __str = 'uid=31';
+var __re = /(uid=)(\d+)/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$11" + '15') !== 'uid=115') {
+  throw new Test262Error('#1: var __str = \'uid=31\'; var __re = /(uid=)(\d+)/; __str.replace(__re, "$11" + \'15\')===\'uid=115\'. Actual: ' + __str.replace(__re, "$11" + '15'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T3.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T3.js
new file mode 100644
index 0000000000..d8abc13544
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A3_T3.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: replace with regexp /(uid=)(\d+)/ returns
+es5id: 15.5.4.11_A3_T3
+description: replaceValue is "$11" + 'A15'
+---*/
+
+var __str = 'uid=31';
+var __re = /(uid=)(\d+)/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__re, "$11" + 'A15') !== 'uid=1A15') {
+  throw new Test262Error('#1: var __str = \'uid=31\'; var __re = /(uid=)(\d+)/; __str.replace(__re, "$11" + \'A15\')===\'uid=1A15\' . Actual: ' + __str.replace(__re, "$11" + 'A15'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T1.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T1.js
new file mode 100644
index 0000000000..968f54808e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T1.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: replace with regexp /([a-z]+)([0-9]+)/ and replace function returns
+es5id: 15.5.4.11_A4_T1
+description: searchValue is /([a-z]+)([0-9]+)/
+---*/
+
+var __str = "abc12 def34";
+var __pattern = /([a-z]+)([0-9]+)/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__pattern, __replFN) !== '12abc def34') {
+  throw new Test262Error('#1: var __str = "abc12 def34"; var __pattern = /([a-z]+)([0-9]+)/; function __replFN() {return arguments[2] + arguments[1];}; __str.replace(__pattern, __replFN)===\'12abc def34\'. Actual: ' + __str.replace(__pattern, __replFN));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __replFN() {
+  return arguments[2] + arguments[1];
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T2.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T2.js
new file mode 100644
index 0000000000..35e33a7158
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T2.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: replace with regexp /([a-z]+)([0-9]+)/ and replace function returns
+es5id: 15.5.4.11_A4_T2
+description: searchValue is /([a-z]+)([0-9]+)/g
+---*/
+
+var __str = "abc12 def34";
+var __pattern = /([a-z]+)([0-9]+)/g;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__pattern, __replFN) !== '12abc 34def') {
+  throw new Test262Error('#1: var __str = "abc12 def34"; var __pattern = /([a-z]+)([0-9]+)/g; function __replFN() {return arguments[2] + arguments[1];}; __str.replace(__pattern, __replFN)===\'12abc 34def\'. Actual: ' + __str.replace(__pattern, __replFN));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __replFN() {
+  return arguments[2] + arguments[1];
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T3.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T3.js
new file mode 100644
index 0000000000..8dbcb0a9e3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T3.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: replace with regexp /([a-z]+)([0-9]+)/ and replace function returns
+es5id: 15.5.4.11_A4_T3
+description: searchValue is /([a-z]+)([0-9]+)/i
+---*/
+
+var __str = "aBc12 def34";
+var __pattern = /([a-z]+)([0-9]+)/i;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__pattern, __replFN) !== '12aBc def34') {
+  throw new Test262Error('#1: var __str = "aBc12 def34"; var __pattern = /([a-z]+)([0-9]+)/i; function __replFN() {return arguments[2] + arguments[1];}; __str.replace(__pattern, __replFN)===\'12aBc def34\'. Actual: ' + __str.replace(__pattern, __replFN));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __replFN() {
+  return arguments[2] + arguments[1];
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T4.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T4.js
new file mode 100644
index 0000000000..c6527a9bad
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A4_T4.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: replace with regexp /([a-z]+)([0-9]+)/ and replace function returns
+es5id: 15.5.4.11_A4_T4
+description: searchValue is /([a-z]+)([0-9]+)/ig
+---*/
+
+var __str = "aBc12 dEf34";
+var __pattern = /([a-z]+)([0-9]+)/ig;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__pattern, __replFN) !== '12aBc 34dEf') {
+  throw new Test262Error('#1: var __str = "aBc12 dEf34"; var __pattern = /([a-z]+)([0-9]+)/ig; function __replFN() {return arguments[2] + arguments[1];}; __str.replace(__pattern, __replFN)===\'12aBc 34dEf\'. Actual: ' + __str.replace(__pattern, __replFN));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __replFN() {
+  return arguments[2] + arguments[1];
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A5_T1.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A5_T1.js
new file mode 100644
index 0000000000..491d0ae818
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A5_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Use replace with regexp as searchValue and use $ in replaceValue
+es5id: 15.5.4.11_A5_T1
+description: searchValue is  regexp /^(a+)\1*,\1+$/ and replaceValue is "$1"
+---*/
+
+var __str = "aaaaaaaaaa,aaaaaaaaaaaaaaa";
+var __pattern = /^(a+)\1*,\1+$/;
+var __repl = "$1";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.replace(__pattern, __repl) !== 'aaaaa') {
+  throw new Test262Error('#1: var __str = "aaaaaaaaaa,aaaaaaaaaaaaaaa"; var __pattern = /^(a+)\\1*,\\1+$/; var __repl = "$1"; __str.replace(__pattern, __repl)===\'aaaaa\'. Actual: ' + __str.replace(__pattern, __repl));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A6.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A6.js
new file mode 100644
index 0000000000..f5f167a1fb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace has not prototype property
+es5id: 15.5.4.11_A6
+description: Checking String.prototype.replace.prototype;
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.replace.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.replace.prototype === undefined. Actual: ' + String.prototype.replace.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A7.js b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A7.js
new file mode 100644
index 0000000000..af06d225d7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/S15.5.4.11_A7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.replace can't be used as constructor
+es5id: 15.5.4.11_A7
+description: Checking if creating the String.prototype.replace object fails
+---*/
+
+var __FACTORY = String.prototype.replace;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.replace; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if (e instanceof Test262Error) throw e;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/browser.js b/js/src/tests/test262/built-ins/String/prototype/replace/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-get-err.js b/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-get-err.js
new file mode 100644
index 0000000000..bad72b1bbc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-get-err.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Behavior when error is thrown accessing @@replace property
+es6id: 21.1.3.14
+info: |
+    [...]
+    3. If searchValue is neither undefined nor null, then
+       a. Let replacer be GetMethod(searchValue, @@replace).
+       b. ReturnIfAbrupt(replacer).
+features: [Symbol.replace]
+---*/
+
+var poisonedReplace = {};
+Object.defineProperty(poisonedReplace, Symbol.replace, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.replace(poisonedReplace);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-invocation.js b/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-invocation.js
new file mode 100644
index 0000000000..bde2b7ee0b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-invocation.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Invocation of @@replace property of user-supplied objects
+es6id: 21.1.3.14
+info: |
+    [...]
+    3. If searchValue is neither undefined nor null, then
+       a. Let replacer be GetMethod(searchValue, @@replace).
+       b. ReturnIfAbrupt(replacer).
+       c. If replacer is not undefined, then
+          i. Return Call(replacer, searchValue, «O, replaceValue»).
+features: [Symbol.replace]
+---*/
+
+var searchValue = {};
+var returnVal = {};
+var callCount = 0;
+var thisVal, args;
+
+searchValue[Symbol.replace] = function() {
+  callCount += 1;
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+assert.sameValue(''.replace(searchValue, 'replace value'), returnVal);
+assert.sameValue(thisVal, searchValue);
+assert.notSameValue(args, undefined);
+assert.sameValue(args.length, 2);
+assert.sameValue(args[0], '');
+assert.sameValue(args[1], 'replace value');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-is-null.js b/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-is-null.js
new file mode 100644
index 0000000000..2654ed83bf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/cstm-replace-is-null.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replace
+description: >
+  If searchValue's Symbol.replace property is null, no error is thrown.
+info: |
+  String.prototype.replace ( searchValue, replaceValue )
+
+  [...]
+  2. If searchValue is neither undefined nor null, then
+    a. Let replacer be ? GetMethod(searchValue, @@replace).
+    b. If replacer is not undefined, then
+      [...]
+  [...]
+  12. Return newString.
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+features: [Symbol.replace]
+---*/
+
+var searchValue = {};
+searchValue[Symbol.replace] = null;
+searchValue.toString = function() { return "3"; };
+searchValue.valueOf = function() { throw new Test262Error("should not be called"); };
+
+var replacer = function() { return "<foo>"; };
+assert.sameValue("ab3c".replace(searchValue, replacer), "ab<foo>c");
+assert.sameValue("ab3c".replace(searchValue, "<foo>"), "ab<foo>c");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/length.js b/js/src/tests/test262/built-ins/String/prototype/replace/length.js
new file mode 100644
index 0000000000..9146fd1fcb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/length.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replace
+description: >
+  String.prototype.replace.length is 2.
+info: |
+  String.prototype.replace ( searchValue, replaceValue )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description, including optional
+    parameters.
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(String.prototype.replace, "length", {
+  value: 2,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/name.js b/js/src/tests/test262/built-ins/String/prototype/replace/name.js
new file mode 100644
index 0000000000..7e783a3585
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.14
+description: >
+  String.prototype.replace.name is "replace".
+info: |
+  String.prototype.replace (searchValue, replaceValue )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.replace.name, "replace");
+
+verifyNotEnumerable(String.prototype.replace, "name");
+verifyNotWritable(String.prototype.replace, "name");
+verifyConfigurable(String.prototype.replace, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/replace/not-a-constructor.js
new file mode 100644
index 0000000000..c28df5ae80
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.replace does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.replace),
+  false,
+  'isConstructor(String.prototype.replace) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.replace();
+}, '`new String.prototype.replace()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/replaceValue-evaluation-order-regexp-object.js b/js/src/tests/test262/built-ins/String/prototype/replace/replaceValue-evaluation-order-regexp-object.js
new file mode 100644
index 0000000000..1eb0d40aab
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/replaceValue-evaluation-order-regexp-object.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replace
+description: >
+  Non-callable replaceValue is evaluated via toString
+info: |
+  String.prototype.replace ( searchValue, replaceValue )
+
+  If functionalReplace is false, then
+    Set replaceValue to ? ToString(replaceValue).
+---*/
+
+let calls = 0;
+let replaceValue = /$/;
+let oldToString = replaceValue.toString.bind(replaceValue);
+
+replaceValue.toString = () => {
+  calls += 1;
+  return oldToString();
+};
+
+let newString = "".replace("a", replaceValue);
+assert.sameValue(newString, "");
+assert.sameValue(calls, 1);
+assert.sameValue("dollar".replace("dollar", /$/), "/$/");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/replaceValue-evaluation-order.js b/js/src/tests/test262/built-ins/String/prototype/replace/replaceValue-evaluation-order.js
new file mode 100644
index 0000000000..aeb45287ba
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/replaceValue-evaluation-order.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replace
+description: >
+  Non-callable replaceValue is evaluated before searching the string.
+info: |
+  String.prototype.replace ( searchValue, replaceValue )
+
+  ...
+  6. If functionalReplace is false, then
+    a. Set replaceValue to ? ToString(replaceValue).
+  7. Search string for the first occurrence of searchString and let pos be the
+  index within string of the first code unit of the matched substring and let
+  matched be searchString. If no occurrences of searchString were found, return string.
+---*/
+
+var calls = 0;
+var replaceValue = {
+  toString: function() {
+    calls += 1;
+    return "b";
+  },
+};
+
+var newString = "".replace("a", replaceValue);
+assert.sameValue(newString, "");
+assert.sameValue(calls, 1);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/shell.js b/js/src/tests/test262/built-ins/String/prototype/replace/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/replace/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/replace/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..50e7dd8457
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replace/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.replace
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var replace = String.prototype.replace;
+
+assert.sameValue(typeof replace, 'function');
+
+assert.throws(TypeError, function() {
+  replace.call(undefined, '', '');
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  replace.call(null, '', '');
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/browser.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0024.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0024.js
new file mode 100644
index 0000000000..c4e83a5636
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0024.js
@@ -0,0 +1,72 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($$)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+features: [String.prototype.replaceAll]
+---*/
+
+var str = 'Ninguém é igual a ninguém. Todo o ser humano é um estranho ímpar.';
+
+var result;
+
+result = str.replaceAll('ninguém', '$$');
+assert.sameValue(result, 'Ninguém é igual a $. Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('é', '$$');
+assert.sameValue(result, 'Ningu$m $ igual a ningu$m. Todo o ser humano $ um estranho ímpar.');
+
+result = str.replaceAll('é', '$$ -');
+assert.sameValue(result, 'Ningu$ -m $ - igual a ningu$ -m. Todo o ser humano $ - um estranho ímpar.');
+
+result = str.replaceAll('é', '$$&');
+assert.sameValue(result, 'Ningu$&m $& igual a ningu$&m. Todo o ser humano $& um estranho ímpar.');
+
+result = str.replaceAll('é', '$$$');
+assert.sameValue(result, 'Ningu$$m $$ igual a ningu$$m. Todo o ser humano $$ um estranho ímpar.');
+
+result = str.replaceAll('é', '$$$$');
+assert.sameValue(result, 'Ningu$$m $$ igual a ningu$$m. Todo o ser humano $$ um estranho ímpar.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0026.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0026.js
new file mode 100644
index 0000000000..17f2031231
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0026.js
@@ -0,0 +1,66 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($&)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+features: [String.prototype.replaceAll]
+---*/
+
+var str = 'Ninguém é igual a ninguém. Todo o ser humano é um estranho ímpar.';
+
+var result;
+
+result = str.replaceAll('ninguém', '$&');
+assert.sameValue(result, 'Ninguém é igual a ninguém. Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('ninguém', '($&)');
+assert.sameValue(result, 'Ninguém é igual a (ninguém). Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('é', '($&)');
+assert.sameValue(result, 'Ningu(é)m (é) igual a ningu(é)m. Todo o ser humano (é) um estranho ímpar.');
+
+result = str.replaceAll('é', '($&) $&');
+assert.sameValue(result, 'Ningu(é) ém (é) é igual a ningu(é) ém. Todo o ser humano (é) é um estranho ímpar.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0027.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0027.js
new file mode 100644
index 0000000000..4bb9f00b60
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0027.js
@@ -0,0 +1,66 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($')
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+features: [String.prototype.replaceAll]
+---*/
+
+var str = 'Ninguém é igual a ninguém. Todo o ser humano é um estranho ímpar.';
+
+var result;
+
+result = str.replaceAll('ninguém', '$\'');
+assert.sameValue(result, 'Ninguém é igual a . Todo o ser humano é um estranho ímpar.. Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('.', '--- $\'');
+assert.sameValue(result, 'Ninguém é igual a ninguém---  Todo o ser humano é um estranho ímpar. Todo o ser humano é um estranho ímpar--- ');
+
+result = str.replaceAll('é', '($\')');
+assert.sameValue(result, 'Ningu(m é igual a ninguém. Todo o ser humano é um estranho ímpar.)m ( igual a ninguém. Todo o ser humano é um estranho ímpar.) igual a ningu(m. Todo o ser humano é um estranho ímpar.)m. Todo o ser humano ( um estranho ímpar.) um estranho ímpar.');
+
+result = str.replaceAll('é', '($\') $\'');
+assert.sameValue(result, 'Ningu(m é igual a ninguém. Todo o ser humano é um estranho ímpar.) m é igual a ninguém. Todo o ser humano é um estranho ímpar.m ( igual a ninguém. Todo o ser humano é um estranho ímpar.)  igual a ninguém. Todo o ser humano é um estranho ímpar. igual a ningu(m. Todo o ser humano é um estranho ímpar.) m. Todo o ser humano é um estranho ímpar.m. Todo o ser humano ( um estranho ímpar.)  um estranho ímpar. um estranho ímpar.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x003C.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x003C.js
new file mode 100644
index 0000000000..a41388960c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x003C.js
@@ -0,0 +1,73 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($<)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+
+  $<
+  1. If namedCaptures is undefined, the replacement text is the String "$<".
+  ...
+features: [String.prototype.replaceAll, Symbol.replace]
+---*/
+
+var str = 'aaaaaaaaaaaaaaaa aaaaaaaa aaaaaaaaaaaaaaaa';
+
+var result;
+
+// captures is always an empty list if GetSubstitution is called from the string value of SearchValue
+
+result = str.replaceAll('a', '$<');
+assert.sameValue(result, '$<$<$<$<$<$<$<$<$<$<$<$<$<$<$<$< $<$<$<$<$<$<$<$< $<$<$<$<$<$<$<$<$<$<$<$<$<$<$<$<');
+
+var customRE = /./g;
+
+Object.defineProperty(customRE, Symbol.replace, {
+  value: undefined
+});
+
+result = '------------------- /./g -------/./g'.replaceAll(customRE, 'a($<$<)');
+assert.sameValue(result, '------------------- a($<$<) -------a($<$<)');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0060.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0060.js
new file mode 100644
index 0000000000..f82f575bf4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024-0x0060.js
@@ -0,0 +1,69 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($`)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+features: [String.prototype.replaceAll]
+---*/
+
+var str = 'Ninguém é igual a ninguém. Todo o ser humano é um estranho ímpar.';
+
+var result;
+
+result = str.replaceAll('ninguém', '$`');
+assert.sameValue(result, 'Ninguém é igual a Ninguém é igual a . Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('Ninguém', '$`');
+assert.sameValue(result, ' é igual a ninguém. Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('ninguém', '($`)');
+assert.sameValue(result, 'Ninguém é igual a (Ninguém é igual a ). Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('é', '($`)');
+assert.sameValue(result, 'Ningu(Ningu)m (Ninguém ) igual a ningu(Ninguém é igual a ningu)m. Todo o ser humano (Ninguém é igual a ninguém. Todo o ser humano ) um estranho ímpar.');
+
+result = str.replaceAll('é', '($`) $`');
+assert.sameValue(result, 'Ningu(Ningu) Ningum (Ninguém ) Ninguém  igual a ningu(Ninguém é igual a ningu) Ninguém é igual a ningum. Todo o ser humano (Ninguém é igual a ninguém. Todo o ser humano ) Ninguém é igual a ninguém. Todo o ser humano  um estranho ímpar.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024.js
new file mode 100644
index 0000000000..125fcdd7dd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024.js
@@ -0,0 +1,66 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+features: [String.prototype.replaceAll]
+---*/
+
+var str = 'Ninguém é igual a ninguém. Todo o ser humano é um estranho ímpar.';
+
+var result;
+
+result = str.replaceAll('ninguém', '$');
+assert.sameValue(result, 'Ninguém é igual a $. Todo o ser humano é um estranho ímpar.');
+
+result = str.replaceAll('é', '$');
+assert.sameValue(result, 'Ningu$m $ igual a ningu$m. Todo o ser humano $ um estranho ímpar.');
+
+result = str.replaceAll('é', '$ -');
+assert.sameValue(result, 'Ningu$ -m $ - igual a ningu$ -m. Todo o ser humano $ - um estranho ímpar.');
+
+result = str.replaceAll('é', '$$$');
+assert.sameValue(result, 'Ningu$$m $$ igual a ningu$$m. Todo o ser humano $$ um estranho ímpar.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024N.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024N.js
new file mode 100644
index 0000000000..97e92fead1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024N.js
@@ -0,0 +1,95 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($N)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+
+  The nth element of captures, where n is a single digit in the range 1 to 9. If n ≤ m and the nth element of captures is undefined, use the empty String instead. If n > m, no replacement is done. 
+features: [String.prototype.replaceAll, Symbol.replace]
+---*/
+
+var str = 'ABC AAA ABC AAA';
+
+var result;
+
+// captures is always an empty list if GetSubstitution is called from the string value of SearchValue
+
+result = str.replaceAll('ABC', '$1');
+assert.sameValue(result, '$1 AAA $1 AAA');
+
+result = str.replaceAll('ABC', '$2');
+assert.sameValue(result, '$2 AAA $2 AAA');
+
+result = str.replaceAll('ABC', '$3');
+assert.sameValue(result, '$3 AAA $3 AAA');
+
+result = str.replaceAll('ABC', '$4');
+assert.sameValue(result, '$4 AAA $4 AAA');
+
+result = str.replaceAll('ABC', '$5');
+assert.sameValue(result, '$5 AAA $5 AAA');
+
+result = str.replaceAll('ABC', '$6');
+assert.sameValue(result, '$6 AAA $6 AAA');
+
+result = str.replaceAll('ABC', '$7');
+assert.sameValue(result, '$7 AAA $7 AAA');
+
+result = str.replaceAll('ABC', '$8');
+assert.sameValue(result, '$8 AAA $8 AAA');
+
+result = str.replaceAll('ABC', '$9');
+assert.sameValue(result, '$9 AAA $9 AAA');
+
+var customRE = /./g;
+
+Object.defineProperty(customRE, Symbol.replace, {
+  value: undefined
+});
+
+result = '--- /./g --- /a/g --- /./g ---'.replaceAll(customRE, 'a($1$1)');
+assert.sameValue(result, '--- a($1$1) --- /a/g --- a($1$1) ---');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024NN.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024NN.js
new file mode 100644
index 0000000000..96c3798b35
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/getSubstitution-0x0024NN.js
@@ -0,0 +1,74 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacement Text Symbol Substitutions ($NN)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+
+  Table 53: Replacement Text Symbol Substitutions
+  ...
+
+  The nnth element of captures, where nn is a two-digit decimal number in the range 01 to 99. If nn ≤ m and the nnth element of captures is undefined, use the empty String instead. If nn is 00 or nn > m, no replacement is done.
+features: [String.prototype.replaceAll, Symbol.replace]
+---*/
+
+var str = 'aaaaaaaaaaaaaaaa aaaaaaaa aaaaaaaaaaaaaaaa';
+
+var result;
+
+// captures is always an empty list if GetSubstitution is called from the string value of SearchValue
+
+result = str.replaceAll('a', '$11');
+assert.sameValue(result, '$11$11$11$11$11$11$11$11$11$11$11$11$11$11$11$11 $11$11$11$11$11$11$11$11 $11$11$11$11$11$11$11$11$11$11$11$11$11$11$11$11');
+
+result = str.replaceAll('a', '$29');
+assert.sameValue(result, '$29$29$29$29$29$29$29$29$29$29$29$29$29$29$29$29 $29$29$29$29$29$29$29$29 $29$29$29$29$29$29$29$29$29$29$29$29$29$29$29$29');
+
+var customRE = /./g;
+
+Object.defineProperty(customRE, Symbol.replace, {
+  value: undefined
+});
+
+result = '------------------- /./g -------/./g'.replaceAll(customRE, 'a($12$11)');
+assert.sameValue(result, '------------------- a($12$11) -------a($12$11)');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/length.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/length.js
new file mode 100644
index 0000000000..9bd309d638
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/length.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  String.prototype.replaceAll.length value and descriptor.
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.replaceAll]
+---*/
+
+verifyProperty(String.prototype.replaceAll, 'length', {
+  value: 2,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/name.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/name.js
new file mode 100644
index 0000000000..9ca5c78acb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/name.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  String.prototype.replaceAll.name value and descriptor.
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.replaceAll]
+---*/
+
+verifyProperty(String.prototype.replaceAll, 'name', {
+  value: 'replaceAll',
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/not-a-constructor.js
new file mode 100644
index 0000000000..b3b9ca6503
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.replaceAll does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.replaceAll),
+  false,
+  'isConstructor(String.prototype.replaceAll) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.replaceAll();
+}, '`new String.prototype.replaceAll()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceAll.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceAll.js
new file mode 100644
index 0000000000..d46cba45b1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceAll.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.replaceAll]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  '`typeof String.prototype.replaceAll` is `function`'
+);
+
+verifyProperty(String.prototype, 'replaceAll', {
+  enumerable: false,
+  writable: true,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-abrupt.js
new file mode 100644
index 0000000000..24c586519f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-abrupt.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Return abrupt from Call(replaceValue, ...)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      i. Let replacement be ? ToString(? Call(replaceValue, undefined, « searchString, position, string »).
+features: [String.prototype.replaceAll]
+---*/
+
+function custom() {
+  throw new Test262Error();
+}
+
+assert.throws(Test262Error, function() {
+  'a'.replaceAll('a', custom);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-each-match-position.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-each-match-position.js
new file mode 100644
index 0000000000..0873c0dd28
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-each-match-position.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  If replaceValue is a function, it's called for each matching position
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      i. Let replacement be ? ToString(? Call(replaceValue, undefined, « searchString, position, string »).
+features: [String.prototype.replaceAll]
+includes: [compareArray.js]
+---*/
+
+var t = (function() { return this; })();
+
+var calls = [];
+var replaceValue = function(...args) {
+  calls.push([this, ...args]);
+  return 'z';
+};
+
+var searchValue = new String('ab c');
+
+var obj = new String('ab c ab cdab cab c');
+
+var result = obj.replaceAll(searchValue, replaceValue);
+assert.sameValue(calls.length, 4);
+assert.sameValue(result, 'z zdzz');
+
+var str = obj.toString();
+
+assert.compareArray(calls[0], [t, 'ab c', 0, str]);
+assert.compareArray(calls[1], [t, 'ab c', 5, str]);
+assert.compareArray(calls[2], [t, 'ab c', 10, str]);
+assert.compareArray(calls[3], [t, 'ab c', 14, str]);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-matching-empty.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-matching-empty.js
new file mode 100644
index 0000000000..20bad8d142
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-matching-empty.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  replaceValue can be called for matching position of an empty string
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      i. Let replacement be ? ToString(? Call(replaceValue, undefined, « searchString, position, string »).
+features: [String.prototype.replaceAll]
+includes: [compareArray.js]
+---*/
+
+var t = (function() { return this; })();
+
+var calls = [];
+var replaceValue = function(...args) {
+  calls.push([this, ...args]);
+  return 'abc';
+};
+
+var searchValue = new String('');
+
+var obj = new String('');
+
+var result = obj.replaceAll(searchValue, replaceValue);
+assert.sameValue(calls.length, 1);
+assert.sameValue(result, 'abc');
+
+var str = obj.toString();
+
+assert.compareArray(calls[0], [t, '', 0, str]);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-skip-no-match.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-skip-no-match.js
new file mode 100644
index 0000000000..d8e75b817b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-skip-no-match.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  replaceValue is not called if there isn't a match
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      i. Let replacement be ? ToString(? Call(replaceValue, undefined, « searchString, position, string »).
+features: [String.prototype.replaceAll]
+---*/
+
+function replaceValue() {
+  throw new Test262Error();
+}
+
+assert.sameValue(
+  'a'.replaceAll('b', replaceValue),
+  'a'
+);
+
+assert.sameValue(
+  'a'.replaceAll('aa', replaceValue),
+  'a'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-tostring-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-tostring-abrupt.js
new file mode 100644
index 0000000000..d4d605a456
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-call-tostring-abrupt.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Return abrupt from ToString(Call(replaceValue, ...))
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      i. Let replacement be ? ToString(? Call(replaceValue, undefined, « searchString, position, string »).
+features: [String.prototype.replaceAll, Symbol]
+---*/
+
+function custom() {
+  return {
+    toString() {
+      throw new Test262Error();
+    }
+  }
+}
+
+assert.throws(Test262Error, function() {
+  'a'.replaceAll('a', custom);
+});
+
+function symbol() {
+  return {
+    toString() {
+      return Symbol();
+    }
+  }
+}
+
+assert.throws(TypeError, function() {
+  'a'.replaceAll('a', symbol);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-fn-skip-toString.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-fn-skip-toString.js
new file mode 100644
index 0000000000..77c34425fd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-fn-skip-toString.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Skip ToString(replaceValue) if it's a function
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    ...
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+features: [String.prototype.replaceAll]
+---*/
+
+var called = 0;
+var replaceValue = function() {
+  called += 1;
+  return 'b';
+};
+var poisoned = 0;
+Object.defineProperty(replaceValue, 'toString', {
+  value: function() {
+    poisoned += 1;
+    throw 'should not call this';
+  }
+});
+
+var result = 'aaa'.replaceAll('a', replaceValue);
+assert.sameValue(called, 3);
+assert.sameValue(poisoned, 0);
+assert.sameValue(result, 'bbb');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-tostring-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-tostring-abrupt.js
new file mode 100644
index 0000000000..c674303092
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-tostring-abrupt.js
@@ -0,0 +1,77 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Returns abrupt completions from ToString(replaceValue)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    ...
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+features: [String.prototype.replaceAll, Symbol]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+var thisValueCalled = 0;
+var thisValue = {
+  toString() {
+    thisValueCalled += 1;
+    return '';
+  }
+};
+
+var searchValueCalled = 0;
+var searchValue = {
+  toString() {
+    searchValueCalled += 1;
+    return '';
+  }
+};
+
+var called = 0;
+var replaceValue = {
+  toString() {
+    called += 1;
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(thisValue, searchValue, replaceValue);
+}, 'custom');
+assert.sameValue(called, 1);
+assert.sameValue(thisValueCalled, 1);
+assert.sameValue(searchValueCalled, 1);
+
+searchValueCalled = 0;
+thisValueCalled = 0;
+called = 0;
+replaceValue = {
+  toString() {
+    called += 1;
+    return Symbol();
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(thisValue, searchValue, replaceValue);
+}, 'Symbol');
+assert.sameValue(called, 1);
+assert.sameValue(thisValueCalled, 1);
+assert.sameValue(searchValueCalled, 1);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-value-replaces-string.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-value-replaces-string.js
new file mode 100644
index 0000000000..e009730f8d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-value-replaces-string.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  replaceValue is used to replace matching positions in string
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+features: [String.prototype.replaceAll]
+---*/
+
+var result = 'aaab a a aac'.replaceAll('aa', 'z');
+assert.sameValue(result, 'zab a a zc');
+
+result = 'aaab a a aac'.replaceAll('aa', 'a');
+assert.sameValue(result, 'aab a a ac');
+
+result = 'aaab a a aac'.replaceAll('a', 'a');
+assert.sameValue(result, 'aaab a a aac');
+
+result = 'aaab a a aac'.replaceAll('a', 'z');
+assert.sameValue(result, 'zzzb z z zzc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-value-tostring.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-value-tostring.js
new file mode 100644
index 0000000000..aa9d1a5549
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/replaceValue-value-tostring.js
@@ -0,0 +1,99 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  ToString(replaceValue)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+features: [String.prototype.replaceAll, Symbol.toPrimitive]
+---*/
+
+var result;
+
+var called;
+var replaceValue;
+
+called = 0;
+replaceValue = {
+  [Symbol.toPrimitive](){
+    called += 1;
+    return 'z';
+  },
+  toString() {
+    throw 'poison';
+  },
+  valueOf() {
+    throw 'poison';
+  },
+};
+
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, 'zz', 'object @@toPrimitive');
+assert.sameValue(called, 1, '@@toPrimitive is called only once');
+
+called = 0;
+replaceValue = {
+  [Symbol.toPrimitive]: undefined,
+  toString() {
+    called += 1;
+    return 'z';
+  },
+  valueOf() {
+    throw 'poison';
+  },
+};
+
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, 'zz', 'object toString');
+assert.sameValue(called, 1, 'toString is called only once');
+
+called = 0;
+replaceValue = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf() {
+    called += 1;
+    return 'z';
+  },
+};
+
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, 'zz', 'object valueOf');
+assert.sameValue(called, 1, 'valueOf is called only once');
+
+replaceValue = 42;
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, '4242', 'number');
+
+replaceValue = true;
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, 'truetrue', 'Boolean true');
+
+replaceValue = false;
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, 'falsefalse', 'Boolean false');
+
+replaceValue = undefined;
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, 'undefinedundefined', 'undefined');
+
+replaceValue = null;
+result = 'aa'.replaceAll('a', replaceValue);
+assert.sameValue(result, 'nullnull', 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-empty-string-this-empty-string.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-empty-string-this-empty-string.js
new file mode 100644
index 0000000000..db3e44c1f9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-empty-string-this-empty-string.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Matching empty string for the this value and the searchValue
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy).
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+features: [String.prototype.replaceAll]
+---*/
+
+var result = ''.replaceAll('', 'abc');
+assert.sameValue(result, 'abc');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-empty-string.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-empty-string.js
new file mode 100644
index 0000000000..3ab6dde25a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-empty-string.js
@@ -0,0 +1,55 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Replacements when the search value is the empty string
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  10. Let position be ! StringIndexOf(string, searchString, 0).
+  11. Repeat, while position is not -1
+    a. Append position to the end of matchPositions.
+    b. Let position be ! StringIndexOf(string, searchString, position + advanceBy). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+
+  StringIndexOf ( string, searchValue, fromIndex )
+
+  ...
+  4. Let len be the length of string.
+  5. If searchValue is the empty string, and fromIndex <= len, return fromIndex.
+  6. Let searchLen be the length of searchValue.
+  7. If there exists any integer k such that fromIndex ≤ k ≤ len - searchLen and for all nonnegative integers j less than searchLen, the code unit at index k + j within string is the same as the code unit at index j within searchValue, let pos be the smallest (closest to -∞) such integer. Otherwise, let pos be -1.
+  8. Return pos. 
+
+  Runtime Semantics: GetSubstitution ( matched, str, position, captures, namedCaptures, replacement )
+
+  ...
+  2. Let matchLength be the number of code units in matched.
+  ...
+  4. Let stringLength be the number of code units in str.
+  ...
+  9. Let tailPos be position + matchLength.
+  10. Let m be the number of elements in captures.
+  11. Let result be the String value derived from replacement by copying code unit elements from replacement to result while performing replacements as specified in Table 53. These $ replacements are done left-to-right, and, once such a replacement is performed, the new replacement text is not subject to further replacements.
+  12 Return result.
+features: [String.prototype.replaceAll]
+---*/
+
+var result;
+
+result = 'aab c  \nx'.replaceAll('', '_');
+assert.sameValue(result, '_a_a_b_ _c_ _ _\n_x_');
+
+result = 'a'.replaceAll('', '_');
+assert.sameValue(result, '_a_');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-no-g-throws.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-no-g-throws.js
new file mode 100644
index 0000000000..4bf1ad9aa9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-no-g-throws.js
@@ -0,0 +1,64 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Throws a TypeError if flags does not contain "g"
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+  ...
+features: [String.prototype.replaceAll, Symbol.match, Symbol]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+var searchValue = /./;
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'flags is the empty string');
+
+Object.defineProperty(searchValue, 'flags', {
+  value: 'G',
+  writable: true,
+  configurable: true,
+});
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'case sensitive G');
+
+Object.defineProperty(searchValue, 'flags', {
+  value: 'i',
+  writable: true,
+  configurable: true,
+});
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'i');
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-null-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-null-undefined-throws.js
new file mode 100644
index 0000000000..feb898c2de
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-null-undefined-throws.js
@@ -0,0 +1,60 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Throws a TypeError if flags is not an ObjectCoercible (null or undefined)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+  ...
+features: [String.prototype.replaceAll, Symbol.match]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+var called = 0;
+var value = undefined;
+var searchValue = {
+  [Symbol.match]: true,
+  get flags() {
+    called += 1;
+    return value;
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'undefined');
+assert.sameValue(called, 1);
+
+called = 0;
+value = null;
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'null');
+assert.sameValue(called, 1);
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-toString-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-toString-abrupt.js
new file mode 100644
index 0000000000..de261a961c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-flags-toString-abrupt.js
@@ -0,0 +1,60 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Returns abrupt completions from ToString(flags)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+  ...
+features: [String.prototype.replaceAll, Symbol.match, Symbol]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+var searchValue = {
+  [Symbol.match]: true,
+  flags: Symbol(),
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'Symbol');
+
+searchValue.flags = {
+  toString() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'custom abrupt');
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-get-flags-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-get-flags-abrupt.js
new file mode 100644
index 0000000000..bf9bb3edc4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-get-flags-abrupt.js
@@ -0,0 +1,86 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Return Abrupt completion from Get(searchValue, "flags")
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+  ...
+features: [String.prototype.replaceAll, Symbol.match]
+---*/
+
+var searchValue = {
+  [Symbol.match]: true,
+  get flags() {
+    throw new Test262Error;
+  }
+};
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'from custom searchValue object');
+
+var re1 = /./;
+Object.defineProperty(re1, 'flags', {
+  get() { throw new Test262Error(); }
+});
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, re1, poison);
+}, 'from RE instance, using default Symbol.match check');
+
+var called = 0;
+var re2 = /./;
+Object.defineProperty(re2, Symbol.match, {
+  get() {
+    called += 1;
+    return true;
+  }
+});
+Object.defineProperty(re2, 'flags', {
+  get() { throw new Test262Error(); }
+});
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, re2, poison);
+}, 'from RE instance, using Symbol.match check (true)');
+assert.sameValue(called, 1);
+
+called = 0;
+var re3 = /./;
+Object.defineProperty(re3, Symbol.match, {
+  get() {
+    called += 1;
+    return 1;
+  }
+});
+Object.defineProperty(re3, 'flags', {
+  get() { throw new Test262Error(); }
+});
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, re3, poison);
+}, 'from RE instance, using Symbol.match check (1), uses Internal for IsRegExp');
+assert.sameValue(called, 1);
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-isRegExp-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-isRegExp-abrupt.js
new file mode 100644
index 0000000000..8933fa13b7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-isRegExp-abrupt.js
@@ -0,0 +1,49 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Return Abrupt completion from isRegExp
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+  ...
+
+  IsRegExp ( argument )
+
+  1. If Type(argument) is not Object, return false.
+  2. Let matcher be ? Get(argument, @@match).
+  3. If matcher is not undefined, return ! ToBoolean(matcher).
+  4. If argument has a [[RegExpMatcher]] internal slot, return true.
+  5. Return false. 
+features: [String.prototype.replaceAll, Symbol.match]
+---*/
+
+var searchValue = {
+  get [Symbol.match]() {
+    throw new Test262Error();
+  },
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+});
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-RegExp-call-fn.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-RegExp-call-fn.js
new file mode 100644
index 0000000000..b81dfe90ba
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-RegExp-call-fn.js
@@ -0,0 +1,125 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  A RegExp searchValue's Symbol.replace can be called instead of the next steps of replaceAll
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+    d. If replacer is not undefined, then
+      i. Return ? Call(replacer, searchValue, « O, replaceValue »).
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  ...
+features: [String.prototype.replaceAll, Symbol.replace, class]
+includes: [compareArray.js]
+---*/
+
+let called = 0;
+
+class RE extends RegExp {
+  [Symbol.replace](...args) {
+    const actual = super[Symbol.replace](...args);
+
+    // Ordering is intentional to observe call from super
+    called += 1;
+    return actual;
+  }
+
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+}
+
+const t = (function() { return this; })();
+let calls;
+
+function getFn(val) {
+  return function replaceValueFn(...args) {
+    calls.push([this, ...args]);
+    return val;
+  };
+}
+
+const samples = [
+  [ '(a)', 'aaa abc', 'z', 'zzz zbc' ],
+  [ '(a)', 'aaa abc', '$1', '$1$1$1 $1bc' ],
+  [ '(a)', 'aaa abc', '$$', '$$$$$$ $$bc' ],
+  [ '(a)', 'aaa abc', '$&', '$&$&$& $&bc' ],
+  [ '(a)', 'aaa abc', '$\'', '$\'$\'$\' $\'bc' ],
+  [ '(a)', 'aaa abc', '$`', '$`$`$` $`bc' ],
+];
+
+let count = 0;
+for (const [ reStr, thisValue, replaceValue, expected ] of samples) {
+  const searchValue = new RE(reStr, 'g');
+  const replaceFn = getFn(replaceValue);
+
+  // Observes the toString
+  const obj = new String(thisValue);
+
+  called = 0;
+  calls = [];
+
+  const actual = obj.replaceAll(searchValue, replaceFn);
+
+  const message = `sample ${count}: '${thisValue}'.replaceAll(/${reStr}/g, () => '${replaceValue}')`;
+
+  assert.sameValue(called, 1, `called -- ${message}`);
+  assert.sameValue(actual, expected, `actual -- ${message}`);
+
+  assert.sameValue(calls.length, 4, `calls.length -- ${message}`);
+  assert.compareArray(calls[0], [t, 'a', 'a', 0, thisValue]);
+  assert.compareArray(calls[1], [t, 'a', 'a', 1, thisValue]);
+  assert.compareArray(calls[2], [t, 'a', 'a', 2, thisValue]);
+  assert.compareArray(calls[3], [t, 'a', 'a', 4, thisValue]);
+
+  count += 1;
+}
+
+const samplesSticky = [
+  [ '(a)', 'aaa abc', 'z', 'zzz abc' ],
+  [ '(a)', 'aaa abc', '$1', '$1$1$1 abc' ],
+  [ '(a)', 'aaa abc', '$$', '$$$$$$ abc' ],
+  [ '(a)', 'aaa abc', '$&', '$&$&$& abc' ],
+  [ '(a)', 'aaa abc', '$\'', '$\'$\'$\' abc' ],
+  [ '(a)', 'aaa abc', '$`', '$`$`$` abc' ],
+];
+
+count = 0;
+for (const [ reStr, thisValue, replaceValue, expected ] of samplesSticky) {
+  const searchValue = new RE(reStr, 'gy');
+  const replaceFn = getFn(replaceValue);
+
+  // Observes the toString
+  const obj = new String(thisValue);
+
+  called = 0;
+  calls = [];
+
+  const actual = obj.replaceAll(searchValue, replaceFn);
+
+  const message = `sample ${count}: '${thisValue}'.replaceAll(/${reStr}/gy, () => '${replaceValue}')`;
+
+  assert.sameValue(called, 1, `called -- ${message}`);
+  assert.sameValue(actual, expected, `actual -- ${message}`);
+
+  assert.sameValue(calls.length, 3, `calls.length -- ${message}`);
+  assert.compareArray(calls[0], [t, 'a', 'a', 0, thisValue]);
+  assert.compareArray(calls[1], [t, 'a', 'a', 1, thisValue]);
+  assert.compareArray(calls[2], [t, 'a', 'a', 2, thisValue]);
+
+  count += 1;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-RegExp-call.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-RegExp-call.js
new file mode 100644
index 0000000000..d556547a38
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-RegExp-call.js
@@ -0,0 +1,84 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  A RegExp searchValue's Symbol.replace can be called instead of the next steps of replaceAll
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+    d. If replacer is not undefined, then
+      i. Return ? Call(replacer, searchValue, « O, replaceValue »).
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  ...
+features: [String.prototype.replaceAll, Symbol.replace, class]
+---*/
+
+let called = 0;
+
+class RE extends RegExp {
+  [Symbol.replace](...args) {
+    const actual = super[Symbol.replace](...args);
+
+    // Ordering is intentional to observe call from super
+    called += 1;
+    return actual;
+  }
+
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+}
+
+const samples = [
+  [ ['b', 'g'], 'abc abc abc', 'z', 'azc azc azc' ],
+  [ ['b', 'gy'], 'abc abc abc', 'z', 'abc abc abc' ],
+  [ ['b', 'giy'], 'abc abc abc', 'z', 'abc abc abc' ],
+  [ [ '[A-Z]', 'g' ], 'No Uppercase!', '', 'o ppercase!' ],
+  [ [ '[A-Z]', 'gy' ], 'No Uppercase?', '', 'o Uppercase?' ],
+  [ [ '[A-Z]', 'gy' ], 'NO UPPERCASE!', '', ' UPPERCASE!' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '$2-$1', 'ca-bbcca-bbc' ],
+  [ [ '(a(.))', 'g' ], 'abcabcabcabc', '$1$2$3', 'abb$3cabb$3cabb$3cabb$3c' ],
+  [ [ '(((((((((((((a(.).).).).).).).).))))))', 'g' ], 'aabacadaeafagahaiajakalamano a azaya', '($10)-($12)-($1)', '(aabaca)-(aaba)-(aabacadaea)f(agahai)-(agah)-(agahaiajak)(alaman)-(alam)-(alamano a )azaya' ],
+  [ [ 'b', 'g' ], 'abcba', '$\'', 'acbacaa' ],
+  [ [ 'b', 'g' ], 'abcba', '$`', 'aacabca' ],
+  [ [ '(?<named>b)', 'g' ], 'abcba', '($<named>)', 'a(b)c(b)a' ],
+  [ [ '(?<named>b)', 'g' ], 'abcba', '($<named)', 'a($<named)c($<named)a' ],
+  [ [ '(?<named>b)', 'g' ], 'abcba', '($<unnamed>)', 'a()c()a' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($$)', '($)bc($)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($)', '($)bc($)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($$$$)', '($$)bc($$)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($$$)', '($$)bc($$)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($$&)', '($&)bc($&)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($$1)', '($1)bc($1)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($$`)', '($`)bc($`)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($$\')', '($\')bc($\')bc' ],
+  [ [ 'a(?<z>b)(ca)', 'g' ], 'abcabcabcabc', '($$<z>)', '($<z>)bc($<z>)bc' ],
+  [ [ 'a(b)(ca)', 'g' ], 'abcabcabcabc', '($&)', '(abca)bc(abca)bc' ],
+];
+
+let count = 0;
+for (const [ [ reStr, flags ], thisValue, replaceValue, expected ] of samples) {
+  const searchValue = new RE(reStr, flags);
+
+  called = 0;
+  const actual = thisValue.replaceAll(searchValue, replaceValue);
+
+  const message = `sample ${count}: '${thisValue}'.replaceAll(/${reStr}/${flags}, '${replaceValue}')`;
+
+  assert.sameValue(called, 1, message);
+  assert.sameValue(actual, expected, message);
+  count += 1;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-before-tostring.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-before-tostring.js
new file mode 100644
index 0000000000..82136a4b42
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-before-tostring.js
@@ -0,0 +1,60 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  The searchValue is observed before ToString(this value) and ToString(replaceValue)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+    d. If replacer is not undefined, then
+      i. Return ? Call(replacer, searchValue, « O, replaceValue »).
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  ...
+features: [String.prototype.replaceAll, Symbol.replace]
+---*/
+
+var called = 0;
+var searchValue = /./g;
+Object.defineProperty(searchValue, Symbol.replace, {
+  value: function(O, replaceValue) {
+    assert.sameValue(this, searchValue);
+    assert.sameValue(O, poison, 'first arg is the this value of replaceAll');
+    assert.sameValue(replaceValue, poison, 'second arg is the replaceValue');
+    assert.sameValue(arguments.length, 2);
+    called += 1;
+    return 'return from searchValue';
+  }
+});
+
+Object.defineProperty(searchValue, 'toString', {
+  value: function() {
+    throw 'Should not call toString on searchValue';
+  }
+});
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+var returned = ''.replaceAll.call(poison, searchValue, poison);
+
+assert.sameValue(returned, 'return from searchValue');
+assert.sameValue(called, 1);
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-call-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-call-abrupt.js
new file mode 100644
index 0000000000..ed35fa7ed1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-call-abrupt.js
@@ -0,0 +1,50 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Return abrupt completion from Call.call(poison, replacer, poison)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+    d. If replacer is not undefined, then
+      i. Return ? Call(replacer, searchValue, « O, replaceValue »).
+  ...
+features: [String.prototype.replaceAll, Symbol.match, Symbol.replace]
+---*/
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+var searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  [Symbol.replace]() {
+    throw new Test262Error();
+  },
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+});
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-call.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-call.js
new file mode 100644
index 0000000000..2ad07f3c18
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-call.js
@@ -0,0 +1,57 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Return value from Call(replacer, ...)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+    d. If replacer is not undefined, then
+      i. Return ? Call(replacer, searchValue, « O, replaceValue »).
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+features: [String.prototype.replaceAll, Symbol.replace]
+---*/
+
+var called = 0;
+var searchValue = /./g;
+Object.defineProperty(searchValue, Symbol.replace, {
+  value: function(O, replaceValue) {
+    assert.sameValue(this, searchValue);
+    assert.sameValue(O, str, 'first arg is the this value of replaceAll');
+    assert.sameValue(replaceValue, obj, 'second arg is the replaceValue');
+    assert.sameValue(arguments.length, 2);
+    called += 1;
+    return 42;
+  }
+});
+
+Object.defineProperty(searchValue, 'toString', {
+  value: function() {
+    throw 'Should not call searchValue toString'
+  }
+});
+
+var str = new String('Leo');
+var obj = {};
+
+var returned = str.replaceAll(searchValue, obj);
+
+assert.sameValue(returned, 42);
+assert.sameValue(called, 1);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-is-null.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-is-null.js
new file mode 100644
index 0000000000..9614eec319
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-is-null.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  If searchValue's Symbol.replace property is null, no error is thrown.
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  [...]
+  2. If searchValue is neither undefined nor null, then
+    [...]
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+    d. If replacer is not undefined, then
+      [...]
+  [...]
+  16. Return result.
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+features: [String.prototype.replaceAll, Symbol.replace]
+---*/
+
+var searchValue = {};
+searchValue[Symbol.replace] = null;
+searchValue.toString = function() { return "2"; };
+searchValue.valueOf = function() { throw new Test262Error("should not be called"); };
+
+var replacer = function() { return "<foo>"; };
+assert.sameValue("a2b2c".replaceAll(searchValue, replacer), "a<foo>b<foo>c");
+assert.sameValue("a2b2c".replaceAll(searchValue, "<foo>"), "a<foo>b<foo>c");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-method-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-method-abrupt.js
new file mode 100644
index 0000000000..1556a15ef1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-replacer-method-abrupt.js
@@ -0,0 +1,131 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Return abrupt completion from GetMethod(searchValue.@@replace)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    a. Let isRegExp be ? IsRegExp(searchString).
+    b. If isRegExp is true, then
+      i. Let flags be ? Get(searchValue, "flags").
+      ii. Perform ? RequireObjectCoercible(flags).
+      iii. If ? ToString(flags) does not contain "g", throw a TypeError exception.
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+  ...
+
+  GetMethod ( V, P )
+
+  ...
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+  4. If IsCallable(func) is false, throw a TypeError exception.
+  5. Return func. 
+features: [String.prototype.replaceAll, Symbol, Symbol.match, Symbol.replace]
+---*/
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on this/replaceValue';
+  },
+};
+
+var searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  get [Symbol.replace]() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, 'custom abrupt');
+
+searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  [Symbol.replace]: {},
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, '@@replace is an object (not callable)');
+
+searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  [Symbol.replace]: '',
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, '@@replace is a string');
+
+searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  [Symbol.replace]: 42,
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, '@@replace is a number');
+
+searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  [Symbol.replace]: Symbol(),
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, '@@replace is a symbol');
+
+searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  [Symbol.replace]: true,
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, '@@replace is true');
+
+searchValue = {
+  [Symbol.match]: false,
+  flags: 'g',
+  [Symbol.replace]: false,
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(poison, searchValue, poison);
+}, '@@replace is false');
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-tostring-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-tostring-abrupt.js
new file mode 100644
index 0000000000..fa7926c90a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-tostring-abrupt.js
@@ -0,0 +1,76 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Returns abrupt completions from ToString(searchValue)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    ...
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+features: [String.prototype.replaceAll, Symbol]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on replaceValue';
+  },
+};
+
+var thisValueCalled = 0;
+var thisValue = {
+  toString() {
+    thisValueCalled += 1;
+    return '';
+  }
+};
+
+var called = 0;
+var searchValue = {
+  toString() {
+    called += 1;
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(thisValue, searchValue, poison);
+}, 'custom');
+assert.sameValue(called, 1);
+assert.sameValue(thisValueCalled, 1);
+
+thisValueCalled = 0;
+called = 0;
+searchValue = {
+  toString() {
+    called += 1;
+    return Symbol();
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(thisValue, searchValue, poison);
+}, 'Symbol');
+assert.sameValue(called, 1);
+assert.sameValue(thisValueCalled, 1);
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-tostring-regexp.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-tostring-regexp.js
new file mode 100644
index 0000000000..1cdfdbc2e7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/searchValue-tostring-regexp.js
@@ -0,0 +1,58 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  ToString(searchValue)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  4. Let searchString be ? ToString(searchValue).
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+features: [String.prototype.replaceAll, Symbol.replace]
+---*/
+
+var result;
+var searchValue;
+
+searchValue = /./g;
+
+Object.defineProperty(searchValue, Symbol.replace, { value: undefined });
+
+result = 'aa /./g /./g aa'.replaceAll(searchValue, 'z');
+assert.sameValue(result, 'aa z z aa', '/./g');
+
+searchValue = /./gy;
+
+Object.defineProperty(searchValue, Symbol.replace, { value: undefined });
+
+result = 'aa /./gy /./gy aa'.replaceAll(searchValue, 'z');
+assert.sameValue(result, 'aa z z aa', '/./gy');
+
+searchValue = /./gi;
+
+Object.defineProperty(searchValue, Symbol.replace, { value: undefined });
+
+result = 'aa /./gi /./gi aa'.replaceAll(searchValue, 'z');
+assert.sameValue(result, 'aa z z aa', '/./gi');
+
+searchValue = /./iyg;
+
+Object.defineProperty(searchValue, Symbol.replace, { value: undefined });
+
+result = 'aa /./giy /./iyg /./gyi /./giy aa'.replaceAll(searchValue, 'z');
+assert.sameValue(result, 'aa z /./iyg /./gyi z aa', '/./iyg');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/shell.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-is-null-throws.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-is-null-throws.js
new file mode 100644
index 0000000000..eb84d25c5b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-is-null-throws.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Throws TypeError when `this` is null
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  ...
+
+  RequireObjectCoercible ( argument )
+
+  - Undefined: Throw a TypeError exception.
+  - Null: Throw a TypeError exception.
+features: [String.prototype.replaceAll]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+assert.throws(TypeError, function() {
+  String.prototype.replaceAll.call(null);
+});
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-is-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-is-undefined-throws.js
new file mode 100644
index 0000000000..eadce773df
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-is-undefined-throws.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Throws TypeError when `this` is undefined
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  ...
+
+  RequireObjectCoercible ( argument )
+
+  - Undefined: Throw a TypeError exception.
+  - Null: Throw a TypeError exception.
+features: [String.prototype.replaceAll]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+assert.throws(TypeError, function() {
+  String.prototype.replaceAll.call(undefined);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-tostring-abrupt.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-tostring-abrupt.js
new file mode 100644
index 0000000000..fc3376918c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-tostring-abrupt.js
@@ -0,0 +1,67 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  Returns abrupt completions from ToString(this value)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. If searchValue is neither undefined nor null, then
+    ...
+  3. Let string be ? ToString(O).
+  ...
+features: [String.prototype.replaceAll, Symbol]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.replaceAll,
+  'function',
+  'function must exist'
+);
+
+var poisoned = 0;
+var poison = {
+  toString() {
+    poisoned += 1;
+    throw 'Should not call toString on replaceValue';
+  },
+};
+
+var called = 0;
+var thisValue = {
+  toString() {
+    called += 1;
+    throw new Test262Error();
+  }
+}
+
+var searchValue = {
+  toString() {
+    throw 'Should not call toString on searchValue';
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.replaceAll.call(thisValue, searchValue, poison);
+}, 'custom');
+assert.sameValue(called, 1);
+
+called = 0;
+thisValue = {
+  toString() {
+    called += 1;
+    return Symbol();
+  }
+};
+
+assert.throws(TypeError, function() {
+  ''.replaceAll.call(thisValue, searchValue, poison);
+}, 'Symbol');
+assert.sameValue(called, 1);
+
+assert.sameValue(poisoned, 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-tostring.js b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-tostring.js
new file mode 100644
index 0000000000..3de2a9919a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/replaceAll/this-tostring.js
@@ -0,0 +1,93 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  ToString(this value)
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  ...
+  3. Let string be ? ToString(O).
+  4. Let searchString be ? ToString(searchValue).
+  5. Let functionalReplace be IsCallable(replaceValue).
+  6. If functionalReplace is false, then
+    a. Let replaceValue be ? ToString(replaceValue). 
+  ...
+  14. For each position in matchPositions, do
+    a. If functionalReplace is true, then
+      ...
+    b. Else,
+      ...
+      ii. Let captures be a new empty List.
+      iii. Let replacement be GetSubstitution(searchString, string, position, captures, undefined, replaceValue).
+features: [String.prototype.replaceAll, Symbol.toPrimitive]
+---*/
+
+var result;
+
+var called;
+var thisValue;
+
+called = 0;
+thisValue = {
+  [Symbol.toPrimitive](){
+    called += 1;
+    return 'aa';
+  },
+  toString() {
+    throw 'poison';
+  },
+  valueOf() {
+    throw 'poison';
+  },
+};
+
+result = ''.replaceAll.call(thisValue, 'a', 'z');
+assert.sameValue(result, 'zz', 'object @@toPrimitive');
+assert.sameValue(called, 1, '@@toPrimitive is called only once');
+
+called = 0;
+thisValue = {
+  [Symbol.toPrimitive]: undefined,
+  toString() {
+    called += 1;
+    return 'aa';
+  },
+  valueOf() {
+    throw 'poison';
+  },
+};
+
+result = ''.replaceAll.call(thisValue, 'a', 'z');
+assert.sameValue(result, 'zz', 'object toString');
+assert.sameValue(called, 1, 'toString is called only once');
+
+called = 0;
+thisValue = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf() {
+    called += 1;
+    return 'aa';
+  },
+};
+
+result = ''.replaceAll.call(thisValue, 'a', 'z');
+assert.sameValue(result, 'zz', 'object valueOf');
+assert.sameValue(called, 1, 'valueOf is called only once');
+
+thisValue = 4244;
+result = ''.replaceAll.call(thisValue, '4', 'z');
+assert.sameValue(result, 'z2zz', 'number');
+
+thisValue = true;
+result = ''.replaceAll.call(thisValue, 'ru', 'o m');
+assert.sameValue(result, 'to me', 'Boolean true');
+
+thisValue = false;
+result = ''.replaceAll.call(thisValue, 'al', 'on');
+assert.sameValue(result, 'fonse', 'Boolean false');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1.1_T1.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1.1_T1.js
new file mode 100644
index 0000000000..7b2bf39051
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1.1_T1.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.search (regexp) without arguments behaves like with
+    argument "undefined"
+es5id: 15.5.4.12_A1.1_T1
+description: Call search() is the same search(undefined)
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+var x = "".search();
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A10.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A10.js
new file mode 100644
index 0000000000..030386b614
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.search.length property has the attribute ReadOnly
+es5id: 15.5.4.12_A10
+description: >
+    Checking if varying the String.prototype.search.length property
+    fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.search.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.search.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.search.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.search.length;
+
+verifyNotWritable(String.prototype.search, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.search.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.search.length; String.prototype.search.length = function(){return "shifted";}; String.prototype.search.length === __obj. Actual: ' + String.prototype.search.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A11.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A11.js
new file mode 100644
index 0000000000..795e80eb73
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the search method is 1
+es5id: 15.5.4.12_A11
+description: Checking String.prototype.search.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.search.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.search.hasOwnProperty("length") return true. Actual: ' + String.prototype.search.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.search.length !== 1) {
+  throw new Test262Error('#2: String.prototype.search.length === 1. Actual: ' + String.prototype.search.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T1.js
new file mode 100644
index 0000000000..79d929eb54
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T1
+description: Argument is true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.search = String.prototype.search;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.search(true) !== 0) {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.search = String.prototype.search;  __instance.search(true) === 0. Actual: ' + __instance.search(true));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T10.js
new file mode 100644
index 0000000000..334411e1a5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T10.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T10
+description: >
+    Argument is object, and instance is string.  Object with overrided
+    toString function
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+};
+var __str = "ssABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.search(__obj) !== 2) {
+  throw new Test262Error('#1: var __obj = {toString:function(){return "\u0041B";}}; var __str = "ssABB\u0041BABAB"; __str.search(__obj) ===2. Actual: ' + __str.search(__obj));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T11.js
new file mode 100644
index 0000000000..a07f263f8f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T11.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T11
+description: >
+    Argument is object, and instance is string.  Object with overrided
+    toString function, that throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.search(__obj);
+  throw new Test262Error('#1: var x = __str.search(__obj) lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T12.js
new file mode 100644
index 0000000000..c35de14041
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T12.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T12
+description: >
+    Argument is object, and instance is string.  Object with overrided
+    toString and valueOf functions, valueOf throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+}
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.search(__obj);
+  throw new Test262Error('#1: var x = __str.search(__obj) lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T13.js
new file mode 100644
index 0000000000..73014d35cf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T13.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T13
+description: >
+    Argument is object, and instance is string.  Object with overrided
+    toString and valueOf functions
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return 1;
+  }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("ABB\u0041B\u0031ABAB\u0031BBAA".search(__obj) !== 5) {
+  throw new Test262Error('#1: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; "ABB\\u0041B\\u0031ABAB\\u0031BBAA".search(__obj) ===5. Actual: ' + ("ABB\u0041B\u0031ABAB\u0031BBAA".search(__obj)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T14.js
new file mode 100644
index 0000000000..289769742f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T14.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T14
+description: Instance is string, argument is regular expression
+---*/
+
+var __reg = new RegExp("77");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("ABB\u0041BABAB\u0037\u0037BBAA".search(__reg) !== 9) {
+  throw new Test262Error('#1: var __reg = new RegExp("77"); "ABB\\u0041BABAB\\u0037\\u0037BBAA".search(__reg) === 9. Actual: ' + ("ABB\u0041BABAB\u0037\u0037BBAA".search(__reg)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T2.js
new file mode 100644
index 0000000000..7598936a11
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T2.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T2
+description: Argument is function call, and instance is Boolean
+---*/
+
+var __instance = new Boolean;
+
+__instance.search = String.prototype.search;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.search(function() {
+    return false;
+  }()) !== 0) {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.search = String.prototype.search;  __instance.search(function(){return false;}()) === 0. Actual: ' + __instance.search(function() {
+    return false;
+  }()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T4.js
new file mode 100644
index 0000000000..d537dae330
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T4.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T4
+description: Call search (regexp) without arguments
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString() evaluates to "" search() evaluates to search("")
+if ("".search() !== 0) {
+  throw new Test262Error('#1: "".search() === 0. Actual: ' + ("".search()));
+}
+
+if ("--undefined--".search() != 0) {
+  throw new Test262Error('#1: "--undefined--".search() === 0. Actual: ' + ("--undefined--".search()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T5.js
new file mode 100644
index 0000000000..3b391cea83
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T5
+description: Argument is null, and instance is function call, that return string
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" search(null) evaluates to search("null")
+if (function() {
+    return "gnulluna"
+  }().search(null) !== 1) {
+  throw new Test262Error('#1: function(){return "gnulluna"}().search(null) === 1. Actual: ' + function() {
+    return "gnulluna"
+  }().search(null));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T6.js
new file mode 100644
index 0000000000..b576d87328
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T6.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T6
+description: Argument is x, and instance is new String, x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" search(undefined) evaluates to search("undefined")
+if (new String("undefined").search(x) !== 0) {
+  throw new Test262Error('#1: var x; new String("undefined").search(x) === 0. Actual: ' + new String("undefined").search(x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T7.js
new file mode 100644
index 0000000000..a63e0ef059
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T7
+description: Argument is undefined, and instance is new String
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" search(undefined) evaluates to search("undefined")
+if (String("undefined").search(undefined) !== 0) {
+  throw new Test262Error('#1: String("undefined").search(undefined) === 0. Actual: ' + String("undefined").search(undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T8.js
new file mode 100644
index 0000000000..71b0c1603f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T8.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T8
+description: >
+    Argument is void 0, and instance is String object with overrided
+    toString function
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(void 0) evaluates to "undefined" search(void 0) evaluates to search("undefined")
+if (String(__obj).search(void 0) !== 0) {
+  throw new Test262Error('#1: __obj = {toString:function(){}}; String(__obj).search(void 0) === 0. Actual: ' + String(__obj).search(void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T9.js
new file mode 100644
index 0000000000..eb6fefb2b9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A1_T9.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp)
+es5id: 15.5.4.12_A1_T9
+description: >
+    Argument is function call, and instance is String object with
+    overrided toString and valueOf functions
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" search(undefined) evaluates to search("undefined")
+if (new String(__obj).search(function() {}()) !== 0) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; new String(__obj).search(function(){}()) === 0. Actual: ' + new String(__obj).search(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T1.js
new file mode 100644
index 0000000000..2adddf946b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T1.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) returns ...
+es5id: 15.5.4.12_A2_T1
+description: Simple search substring inside string
+---*/
+
+var aString = new String("test string");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (aString.search("string") !== 5) {
+  throw new Test262Error('#1: var aString = new String("test string"); aString.search("string")=== 5. Actual: ' + aString.search("string"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T2.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T2.js
new file mode 100644
index 0000000000..3d967fad65
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T2.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) returns ...
+es5id: 15.5.4.12_A2_T2
+description: Checking case sensitive of search, argument is string
+---*/
+
+var aString = new String("test string");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (aString.search("String") !== -1) {
+  throw new Test262Error('#1: var aString = new String("test string"); aString.search("String")=== -1. Actual: ' + aString.search("String"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T3.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T3.js
new file mode 100644
index 0000000000..ca382ff62c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T3.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) returns ...
+es5id: 15.5.4.12_A2_T3
+description: Checking disabling of case sensitive of search, argument is RegExp
+---*/
+
+var aString = new String("test string");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (aString.search(/String/i) !== 5) {
+  throw new Test262Error('#1: var aString = new String("test string"); aString.search(/String/i)=== 5. Actual: ' + aString.search(/String/i));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T4.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T4.js
new file mode 100644
index 0000000000..9f5f130e23
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T4.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) returns ...
+es5id: 15.5.4.12_A2_T4
+description: >
+    Checking case sensitive of search, argument is RegExp with
+    uppercase symbols
+---*/
+
+var bString = new String("one two three four five");
+var regExp = /Four/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (bString.search(regExp) !== -1) {
+  throw new Test262Error('#1: var bString = new String("one two three four five"); var regExp = /Four/; bString.search(regExp)=== -1. Actual: ' + bString.search(regExp));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T5.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T5.js
new file mode 100644
index 0000000000..3dcb067da5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) returns ...
+es5id: 15.5.4.12_A2_T5
+description: >
+    Checking case sensitive of search, argument is RegExp without
+    uppercase symbols
+---*/
+
+var bString = new String("one two three four five");
+var regExp = /four/;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (bString.search(regExp) !== 14) {
+  throw new Test262Error('#1: var bString = new String("one two three four five"); var regExp = /four/; bString.search(regExp)=== 14. Actual: ' + bString.search(regExp));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T6.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T6.js
new file mode 100644
index 0000000000..fd4dc1a24f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T6.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) returns ...
+es5id: 15.5.4.12_A2_T6
+description: Searching the non-existent "notexist" substring
+---*/
+
+var aString = new String("test string");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (aString.search("notexist") !== -1) {
+  throw new Test262Error('#1: var aString = new String("test string"); aString.search("notexist")=== -1. Actual: ' + aString.search("notexist"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T7.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T7.js
new file mode 100644
index 0000000000..ddd916faad
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A2_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) returns ...
+es5id: 15.5.4.12_A2_T7
+description: Simple search sentence inside string
+---*/
+
+var aString = new String("test string probe");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (aString.search("string pro") !== 5) {
+  throw new Test262Error('#1: var aString = new String("test string probe"); aString.search("string pro")=== 5. Actual: ' + aString.search("string pro"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A3_T1.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A3_T1.js
new file mode 100644
index 0000000000..8f2594a3ca
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A3_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) ignores global properties of regexp
+es5id: 15.5.4.12_A3_T1
+description: >
+    Checking results of search regexp with and without global
+    properties
+---*/
+
+var aString = new String("power of the power of the power of the power of the power of the power of the great sword");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (aString.search(/the/) !== aString.search(/the/g)) {
+  throw new Test262Error('#1: var aString = new String("power of the power of the power of the power of the power of the power of the great sword"); aString.search(/the/)=== aString.search(/the/g). Actual: ' + aString.search(/the/));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A3_T2.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A3_T2.js
new file mode 100644
index 0000000000..c46377f63d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A3_T2.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search (regexp) ignores global properties of regexp
+es5id: 15.5.4.12_A3_T2
+description: >
+    Checking results of search regexp with and without global
+    properties. Unicode symbols used
+---*/
+
+var aString = new String("power \u006F\u0066 the power of the power \u006F\u0066 the power of the power \u006F\u0066 the power of the great sword");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (aString.search(/of/) !== aString.search(/of/g)) {
+  throw new Test262Error('#1: var aString = new String("power \\u006F\\u0066 the power of the power \\u006F\\u0066 the power of the power \\u006F\\u0066 the power of the great sword"); aString.search(/of/)=== aString.search(/of/g). Actual: ' + aString.search(/of/));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A6.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A6.js
new file mode 100644
index 0000000000..e4f90d82a8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search has not prototype property
+es5id: 15.5.4.12_A6
+description: Checking String.prototype.search.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.search.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.search.prototype === undefined. Actual: ' + String.prototype.search.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A7.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A7.js
new file mode 100644
index 0000000000..d8e865cd03
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.search can't be used as constructor
+es5id: 15.5.4.12_A7
+description: Checking if creating the String.prototype.search object fails
+---*/
+
+var __FACTORY = String.prototype.search;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.search; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.1: __FACTORY = String.prototype.search; "__instance = new __FACTORY" throw a TypeError. Actual: ' + (e));
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A8.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A8.js
new file mode 100644
index 0000000000..1735dfb811
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.search.length property has the attribute DontEnum
+es5id: 15.5.4.12_A8
+description: >
+    Checking if enumerating the String.prototype.search.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.search.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.search.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.search.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.search.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.search.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.search) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.search){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A9.js b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A9.js
new file mode 100644
index 0000000000..ffe40c992a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/S15.5.4.12_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.search.length property does not have the attribute
+    DontDelete
+es5id: 15.5.4.12_A9
+description: >
+    Checking if deleting the String.prototype.search.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.search.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.search.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.search.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.search.length) {
+  throw new Test262Error('#1: delete String.prototype.search.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.search.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.search.length; String.prototype.search.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.search.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/browser.js b/js/src/tests/test262/built-ins/String/prototype/search/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-get-err.js b/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-get-err.js
new file mode 100644
index 0000000000..c9b996d864
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-get-err.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Behavior when error is thrown accessing @@search property
+es6id: 21.1.3.15
+info: |
+    [...]
+    3. If regexp is neither undefined nor null, then
+       a. Let searcher be GetMethod(regexp, @@search).
+       b. ReturnIfAbrupt(searcher).
+features: [Symbol.search]
+---*/
+
+var poisonedSearch = {};
+Object.defineProperty(poisonedSearch, Symbol.search, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.search(poisonedSearch);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-invocation.js b/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-invocation.js
new file mode 100644
index 0000000000..2ec7e813ef
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-invocation.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Invocation of @@search property of user-supplied objects
+es6id: 21.1.3.15
+info: |
+    [...]
+    3. If regexp is neither undefined nor null, then
+       a. Let searcher be GetMethod(regexp, @@search).
+       b. ReturnIfAbrupt(searcher).
+       c. If searcher is not undefined, then
+          i. Return Call(searcher, regexp, «O»)
+features: [Symbol.search]
+---*/
+
+var regexp = {};
+var returnVal = {};
+var callCount = 0;
+var thisVal, args;
+
+regexp[Symbol.search] = function() {
+  callCount += 1;
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+assert.sameValue('O'.search(regexp), returnVal);
+assert.sameValue(callCount, 1, 'Invokes the method exactly once');
+assert.sameValue(thisVal, regexp);
+assert.notSameValue(args, undefined);
+assert.sameValue(args.length, 1);
+assert.sameValue(args[0], 'O');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-is-null.js b/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-is-null.js
new file mode 100644
index 0000000000..ef09cfdaec
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/cstm-search-is-null.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.search
+description: >
+  If regexp's Symbol.search property is null, no error is thrown.
+info: |
+  String.prototype.search ( regexp )
+
+  [...]
+  2. If regexp is neither undefined nor null, then
+    a. Let searcher be ? GetMethod(regexp, @@search).
+    b. If searcher is not undefined, then
+      [...]
+  [...]
+  5. Return ? Invoke(rx, @@search, « string »).
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+features: [Symbol.search]
+---*/
+
+var regexp = {};
+regexp[Symbol.search] = null;
+regexp.toString = function() { return "\\d"; };
+regexp.valueOf = function() { throw new Test262Error("should not be called"); };
+
+assert.sameValue("abc".search(regexp), -1);
+assert.sameValue("ab3c".search(regexp), 2);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/invoke-builtin-search-searcher-undef.js b/js/src/tests/test262/built-ins/String/prototype/search/invoke-builtin-search-searcher-undef.js
new file mode 100644
index 0000000000..5a92adc0a4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/invoke-builtin-search-searcher-undef.js
@@ -0,0 +1,53 @@
+// Copyright (C) 2015 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Invocation of @@search property of internally-created RegExps when `this` value has an `undefined` @@search property
+es6id: 21.1.3.15
+info: |
+    [...]
+    3. If regexp is neither undefined nor null, then
+       a. Let searcher be GetMethod(regexp, @@search).
+       b. ReturnIfAbrupt(searcher).
+       c. If searcher is not undefined , then
+          [...]
+    [...]
+    6. Let rx be RegExpCreate(regexp, undefined) (see 21.2.3.2.3).
+    7. ReturnIfAbrupt(rx).
+    8. Return Invoke(rx, @@search, «S»).
+features: [Symbol.search]
+---*/
+
+var target = new String('target');
+var originalSearch = RegExp.prototype[Symbol.search];
+var returnVal = {};
+var result, thisVal, args;
+
+target[Symbol.search] = undefined;
+
+// Fail early if the method is undefined. This test's cleanup logic would
+// otherwise install the value `undefined` to the `Symbol.search` property of
+// the built-in prototype.
+assert.notSameValue(originalSearch, undefined);
+
+RegExp.prototype[Symbol.search] = function() {
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+try {
+  result = target.search('string source');
+
+  assert(thisVal instanceof RegExp);
+  assert.sameValue(thisVal.source, 'string source');
+  assert.sameValue(thisVal.flags, '');
+  assert.sameValue(args.length, 1);
+  assert.sameValue(args[0], 'target');
+  assert.sameValue(result, returnVal);
+} finally {
+  RegExp.prototype[Symbol.search] = originalSearch;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/invoke-builtin-search.js b/js/src/tests/test262/built-ins/String/prototype/search/invoke-builtin-search.js
new file mode 100644
index 0000000000..6eec9da7fd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/invoke-builtin-search.js
@@ -0,0 +1,43 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Invocation of @@search property of internally-created RegExps
+es6id: 21.1.3.15
+info: |
+    [...]
+    6. Let rx be RegExpCreate(regexp, undefined) (see 21.2.3.2.3).
+    7. ReturnIfAbrupt(rx).
+    8. Return Invoke(rx, @@search, «S»).
+features: [Symbol.search]
+---*/
+
+var originalSearch = RegExp.prototype[Symbol.search];
+var returnVal = {};
+var result, thisVal, args;
+
+// Fail early if the method is undefined. This test's cleanup logic would
+// otherwise install the value `undefined` to the `Symbol.search` property of
+// the built-in prototype.
+assert.notSameValue(originalSearch, undefined);
+
+RegExp.prototype[Symbol.search] = function() {
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+try {
+  result = 'target'.search('string source');
+
+  assert(thisVal instanceof RegExp);
+  assert.sameValue(thisVal.source, 'string source');
+  assert.sameValue(thisVal.flags, '');
+  assert.sameValue(args.length, 1);
+  assert.sameValue(args[0], 'target');
+  assert.sameValue(result, returnVal);
+} finally {
+  RegExp.prototype[Symbol.search] = originalSearch;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/name.js b/js/src/tests/test262/built-ins/String/prototype/search/name.js
new file mode 100644
index 0000000000..ad555b4841
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.15
+description: >
+  String.prototype.search.name is "search".
+info: |
+  String.prototype.search ( regexp )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.search.name, "search");
+
+verifyNotEnumerable(String.prototype.search, "name");
+verifyNotWritable(String.prototype.search, "name");
+verifyConfigurable(String.prototype.search, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/search/not-a-constructor.js
new file mode 100644
index 0000000000..c61e4f3b16
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.search does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.search),
+  false,
+  'isConstructor(String.prototype.search) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.search();
+}, '`new String.prototype.search()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/shell.js b/js/src/tests/test262/built-ins/String/prototype/search/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/search/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/search/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..955dac4149
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/search/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.search
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var search = String.prototype.search;
+
+assert.sameValue(typeof search, 'function');
+
+assert.throws(TypeError, function() {
+  search.call(undefined, /./);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  search.call(null, /./);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/shell.js b/js/src/tests/test262/built-ins/String/prototype/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A10.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A10.js
new file mode 100644
index 0000000000..d49e0f0bc9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.slice.length property has the attribute ReadOnly
+es5id: 15.5.4.13_A10
+description: >
+    Checking if varying the String.prototype.slice.length property
+    fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.slice.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.slice.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.slice.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.slice.length;
+
+verifyNotWritable(String.prototype.slice, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.slice.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.slice.length; String.prototype.slice.length = function(){return "shifted";}; String.prototype.slice.length === __obj. Actual: ' + String.prototype.slice.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A11.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A11.js
new file mode 100644
index 0000000000..a32c1aec5e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the slice method is 2
+es5id: 15.5.4.13_A11
+description: Checking String.prototype.slice.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.slice.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.slice.hasOwnProperty("length") return true. Actual: ' + String.prototype.slice.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.slice.length !== 2) {
+  throw new Test262Error('#2: String.prototype.slice.length === 2. Actual: ' + String.prototype.slice.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T1.js
new file mode 100644
index 0000000000..3461e53037
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T1
+description: Arguments are false and true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.slice = String.prototype.slice;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.slice(false, true) !== "t") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.slice = String.prototype.slice;  __instance.slice(false, true) === "t". Actual: ' + __instance.slice(false, true));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T10.js
new file mode 100644
index 0000000000..022f26c334
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T10.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T10
+description: >
+    Arguments are object and function call, and instance is String,
+    object have overrided valueOf function
+---*/
+
+var __obj = {
+  valueOf: function() {
+    return 2;
+  }
+};
+
+var __str = "\u0035ABBBABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.slice(__obj, function() {
+    return __str.slice(0, 1);
+  }()) !== "BBB") {
+  throw new Test262Error('#1: var x; var __obj = {valueOf:function(){return 2;}}; var __str = "\u0035ABBBABAB"; __str.slice(__obj, function(){return __str.slice(0,1);}()) === "BBB". Actual: ' + __str.slice(__obj, function() {
+    return __str.slice(0, 1);
+  }()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T11.js
new file mode 100644
index 0000000000..7b2ec19713
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T11.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T11
+description: >
+    Arguments are objects, and instance is string, objects have
+    overrided valueOf function, that return exception
+---*/
+
+var __obj = {
+  valueOf: function() {
+    throw "instart";
+  }
+};
+var __obj2 = {
+  valueOf: function() {
+    throw "inend";
+  }
+};
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.slice(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.slice(__obj,__obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "instart") {
+    throw new Test262Error('#1.1: Exception === "instart". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T12.js
new file mode 100644
index 0000000000..49463b1948
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T12.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T12
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided valueOf function and toString function, that return
+    exception.  Second object have overrided valueOf function, that
+    return exception
+---*/
+
+var __obj = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    throw "instart";
+  }
+};
+var __obj2 = {
+  valueOf: function() {
+    throw "inend";
+  }
+};
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.slice(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.slice(__obj,__obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "instart") {
+    throw new Test262Error('#1.1: Exception === "instart". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T13.js
new file mode 100644
index 0000000000..90f54f8122
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T13.js
@@ -0,0 +1,40 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T13
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided valueOf and toString functions.  Second object have
+    overrided toString function, that return exception
+---*/
+
+var __obj = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    return 1;
+  }
+};
+var __obj2 = {
+  toString: function() {
+    throw "inend";
+  }
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = "ABB\u0041BABAB\u0031BBAA".slice(__obj, __obj2);
+  throw new Test262Error('#1: "var x = slice(__obj,__obj2)" lead to throwing exception');
+} catch (e) {
+  if (e !== "inend") {
+    throw new Test262Error('#1.1: Exception === "inend". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T14.js
new file mode 100644
index 0000000000..5288bfdd93
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T14.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T14
+description: Used one argument, that is function(){}(). Instance is string
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("report".slice(function() {}()) !== "report") {
+  throw new Test262Error('#1: "report".slice(function(){}()) === "report". Actual: ' + "report".slice(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T15.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T15.js
new file mode 100644
index 0000000000..df74079d4f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T15.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T15
+description: >
+    Call slice without arguments. Instance is Number with
+    prototype.slice = String.prototype.slice
+---*/
+
+var __num = 11.001002;
+
+Number.prototype.slice = String.prototype.slice;
+
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__num.slice() !== "11.001002") {
+  throw new Test262Error('#1: var __num = 11.001002; Number.prototype.slice = String.prototype.slice; __num.slice()==="11.001002". Actual: ' + __num.slice());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T2.js
new file mode 100644
index 0000000000..d2f88a47e9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T2.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T2
+description: >
+    Arguments are function call and x, and instance is Boolean. x is
+    undefined variable
+---*/
+
+var __instance = new Boolean;
+
+__instance.slice = String.prototype.slice;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.slice(function() {
+    return true;
+  }(), x) !== "alse") {
+  throw new Test262Error('#1: var x; __instance = new Boolean; __instance.slice = String.prototype.slice;  __instance.slice(function(){return true;}(),x) === "alse". Actual: ' + __instance.slice(function() {
+    return true;
+  }(), x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T4.js
new file mode 100644
index 0000000000..f425a58d9d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T4.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T4
+description: >
+    Arguments are null and number, and instance is function call, that
+    returned string
+---*/
+
+//since ToInteger(null) yelds 0
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (function() {
+    return "gnulluna"
+  }().slice(null, -3) !== "gnull") {
+  throw new Test262Error('#1: function(){return "gnulluna"}().slice(null, -3) === "gnull". Actual: ' + function() {
+    return "gnulluna"
+  }().slice(null, -3));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T5.js
new file mode 100644
index 0000000000..663dd48624
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T5.js
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T5
+description: >
+    Arguments are null and call other slice(start, end), and instance
+    is function object, that have overrided valueOf and toString
+    functions
+---*/
+
+__func.valueOf = function() {
+  return "gnulluna"
+};
+__func.toString = function() {
+  return __func;
+};
+
+Function.prototype.slice = String.prototype.slice;
+
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__func.slice(null, Function().slice(__func, 5).length) !== "gnull") {
+  throw new Test262Error('#1: __func.slice(null, Function().slice(__func,5).length) === "gnull". Actual: ' + __func.slice(null, Function().slice(__func, 5).length));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __func() {};
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T6.js
new file mode 100644
index 0000000000..3bd4a0d1f1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T6
+description: >
+    Arguments are x and number, and instance is new String, x is
+    undefined variable
+---*/
+
+//since ToInteger(undefined yelds 0)
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (new String("undefined").slice(x, 3) !== "und") {
+  throw new Test262Error('#1: var x; new String("undefined").slice(x,3) === "und". Actual: ' + new String("undefined").slice(x, 3));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T7.js
new file mode 100644
index 0000000000..710b0a7c11
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T7.js
@@ -0,0 +1,19 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T7
+description: Arguments are symbol and undefined, and instance is String
+---*/
+
+//since ToInteger("e") yelds 0
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String(void 0).slice("e", undefined) !== "undefined") {
+  throw new Test262Error('#1: String(void 0).slice("e",undefined) === "undefined". Actual: ' + String(void 0).slice("e", undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T8.js
new file mode 100644
index 0000000000..fac372584a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T8.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T8
+description: >
+    Arguments are negative number and void 0, and instance is
+    String(object), object have overrided toString function
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+//since void 0 yelds 0
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String(__obj).slice(-4, void 0) !== "ined") {
+  throw new Test262Error('#1: __obj = {toString:function(){}}; String(__obj).slice(-4,void 0) === "ined". Actual: ' + String(__obj).slice(-4, void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T9.js
new file mode 100644
index 0000000000..463a9fc99f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A1_T9.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end)
+es5id: 15.5.4.13_A1_T9
+description: >
+    Arguments are undefined and object, and instance is
+    String(object), object have overrided valueOf and toString
+    functions
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+//since ToInteger(undefined) yelds 0
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (new String(__obj).slice( /*(function(){})()*/ undefined, __obj) !== "") {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; new String(__obj).slice(//*(function(){})()*//undefined,__obj) === "". Actual: ' + new String(__obj).slice( /*(function(){})()*/ undefined, __obj));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T1.js
new file mode 100644
index 0000000000..90608aa0a2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T1.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T1
+description: Checking type of slice()
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (typeof __string.slice() !== "string") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); typeof __string.slice() === "string". Actual: ' + typeof __string.slice());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T2.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T2.js
new file mode 100644
index 0000000000..9e12cb4c71
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T2.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T2
+description: start is NaN, end is Infinity
+---*/
+
+var __string = new String('this is a string object');
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(NaN, Infinity) !== "this is a string object") {
+  throw new Test262Error('#1: __string = new String(\'this is a string object\'); __string.slice(NaN, Infinity) === "this is a string object". Actual: ' + __string.slice(NaN, Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T3.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T3.js
new file mode 100644
index 0000000000..5ee4bae1b9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T3.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T3
+description: Call slice from empty String object
+---*/
+
+var __string = new String("");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(1, 0) !== "") {
+  throw new Test262Error('#1: __string = new String(""); __string.slice(1,0) === "". Actual: ' + __string.slice(1, 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T4.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T4.js
new file mode 100644
index 0000000000..1852bd1144
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T4.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T4
+description: start is Infinity, end is NaN
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(Infinity, NaN) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.slice(Infinity, NaN) === "". Actual: ' + __string.slice(Infinity, NaN));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T5.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T5.js
new file mode 100644
index 0000000000..69ce875fbe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T5.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T5
+description: start is Infinity, end is Infinity
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(Infinity, Infinity) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.slice(Infinity, Infinity) === "". Actual: ' + __string.slice(Infinity, Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T6.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T6.js
new file mode 100644
index 0000000000..42eb813c45
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T6.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T6
+description: start is negative float number, end is 0
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(-0.01, 0) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.slice(-0.01,0) === "". Actual: ' + __string.slice(-0.01, 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T7.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T7.js
new file mode 100644
index 0000000000..990ddb476c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T7
+description: start is tested_string.length, end is tested_string.length
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(__string.length, __string.length) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.slice(__string.length, __string.length) === "". Actual: ' + __string.slice(__string.length, __string.length));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T8.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T8.js
new file mode 100644
index 0000000000..5fd8ab1a43
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T8.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T8
+description: start is tested_string.length+1, end is 0
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(__string.length + 1, 0) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.slice(__string.length+1, 0) === "". Actual: ' + __string.slice(__string.length + 1, 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T9.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T9.js
new file mode 100644
index 0000000000..bde6e28c01
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A2_T9.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) returns a string value(not object)
+es5id: 15.5.4.13_A2_T9
+description: start is -Infinity, end is -Infinity
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.slice(-Infinity, -Infinity) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.slice(-Infinity, -Infinity) === "". Actual: ' + __string.slice(-Infinity, -Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T1.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T1.js
new file mode 100644
index 0000000000..524901cf46
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) can be applied to object instances
+es5id: 15.5.4.13_A3_T1
+description: Apply String.prototype.slice to Object instance
+---*/
+
+var __instance = new Object();
+
+__instance.slice = String.prototype.slice;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.slice(0, 8) !== "[object ") {
+  throw new Test262Error('#1: __instance = new Object(); __instance.slice = String.prototype.slice; __instance.slice(0,8) === "[object ". Actual: ' + __instance.slice(0, 8));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T2.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T2.js
new file mode 100644
index 0000000000..a5317e1274
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T2.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) can be applied to object instances
+es5id: 15.5.4.13_A3_T2
+description: >
+    Apply String.prototype.slice to Object instance, use other value
+    for start and end values
+---*/
+
+var __instance = new Object();
+
+__instance.slice = String.prototype.slice;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.slice(8, __instance.toString().length) !== "Object]") {
+  throw new Test262Error('#1: __instance = new Object(); __instance.slice = String.prototype.slice; __instance.slice(8,__instance.toString().length) === "Object]". Actual: ' + __instance.slice(8, __instance.toString().length));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T3.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T3.js
new file mode 100644
index 0000000000..b34ec5e159
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T3.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) can be applied to object instances
+es5id: 15.5.4.13_A3_T3
+description: >
+    Apply String.prototype.slice to Object instance, and call
+    instance.slice(...).slice(...)
+---*/
+
+var __instance = {
+  toString: function() {
+    return "function(){}";
+  }
+};
+
+__instance.slice = String.prototype.slice;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.slice(-Infinity, 8).slice(1, Infinity) !== "unction") {
+  throw new Test262Error('#1: __instance = function(){}; __instance.slice = String.prototype.slice; __instance.slice(-Infinity,8).slice(1,Infinity) === "unction". Actual: ' + __instance.slice(-Infinity, 8).slice(1, Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T4.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T4.js
new file mode 100644
index 0000000000..5753adc20b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A3_T4.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice (start, end) can be applied to object instances
+es5id: 15.5.4.13_A3_T4
+description: >
+    Checknig if applying String.prototype.slice to Function object
+    instance passes
+---*/
+
+__FACTORY.prototype.toString = function() {
+  return this.value + '';
+};
+
+var __instance = new __FACTORY(void 0);
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.slice(0, 100) !== "undefined") {
+  throw new Test262Error('#1: __instance.slice(0,100) === "undefined". Actual: ' + __instance.slice(0, 100));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __FACTORY(value) {
+  this.value = value,
+    this.slice = String.prototype.slice;
+  //this.substring = String.prototype.substring;
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A6.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A6.js
new file mode 100644
index 0000000000..fff0252d31
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice has not prototype property
+es5id: 15.5.4.13_A6
+description: Checking String.prototype.slice.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.slice.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.slice.prototype === undefined. Actual: ' + String.prototype.slice.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A7.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A7.js
new file mode 100644
index 0000000000..aba0108631
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A7.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.slice can't be used as constructor
+es5id: 15.5.4.13_A7
+description: Checking if creating the String.prototype.slice object fails
+---*/
+
+var FACTORY = String.prototype.slice;
+
+assert.throws(TypeError, function() {
+  new FACTORY;
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A8.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A8.js
new file mode 100644
index 0000000000..a2af98ed75
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.slice.length property has the attribute DontEnum
+es5id: 15.5.4.13_A8
+description: >
+    Checking if enumerating the String.prototype.slice.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.slice.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.slice.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.slice.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.slice.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.slice.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.slice) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.slice){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A9.js b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A9.js
new file mode 100644
index 0000000000..2f555102c6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/S15.5.4.13_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.slice.length property does not have the attribute
+    DontDelete
+es5id: 15.5.4.13_A9
+description: >
+    Checking if deleting the String.prototype.slice.length property
+    fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.slice.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.slice.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.slice.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.slice.length) {
+  throw new Test262Error('#1: delete String.prototype.slice.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.slice.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.slice.length; String.prototype.slice.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.slice.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/browser.js b/js/src/tests/test262/built-ins/String/prototype/slice/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/name.js b/js/src/tests/test262/built-ins/String/prototype/slice/name.js
new file mode 100644
index 0000000000..24ea647443
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.16
+description: >
+  String.prototype.slice.name is "slice".
+info: |
+  String.prototype.slice ( start, end )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.slice.name, "slice");
+
+verifyNotEnumerable(String.prototype.slice, "name");
+verifyNotWritable(String.prototype.slice, "name");
+verifyConfigurable(String.prototype.slice, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/slice/not-a-constructor.js
new file mode 100644
index 0000000000..e4220ef5b3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.slice does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.slice),
+  false,
+  'isConstructor(String.prototype.slice) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.slice();
+}, '`new String.prototype.slice()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/shell.js b/js/src/tests/test262/built-ins/String/prototype/slice/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/slice/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/slice/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..8aa09aaa5d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/slice/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.slice
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var slice = String.prototype.slice;
+
+assert.sameValue(typeof slice, 'function');
+
+assert.throws(TypeError, function() {
+  slice.call(undefined, 0);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  slice.call(null, 0);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-new-reg-exp-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-new-reg-exp-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..d4776d407d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-new-reg-exp-and-instance-is-string-hello.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T10
+description: Argument is new RegExp, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re);
+
+var __expected = ["h", "e", "l", "l", "o"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-null-and-instance-is-function-call-that-returned-string.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-null-and-instance-is-function-call-that-returned-string.js
new file mode 100644
index 0000000000..5fe24e5820
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-null-and-instance-is-function-call-that-returned-string.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T5
+description: >
+    Argument is null, and instance is function call that returned
+    string
+---*/
+
+//since ToString(null) evaluates to "null" split(null) evaluates to split("null",0)
+var __split = function() {
+  return "gnulluna"
+}().split(null);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "g", 'The value of __split[0] is "g"');
+assert.sameValue(__split[1], "una", 'The value of __split[1] is "una"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-reg-exp-a-z-and-instance-is-string-abc.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-reg-exp-a-z-and-instance-is-string-abc.js
new file mode 100644
index 0000000000..1a68255647
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-reg-exp-a-z-and-instance-is-string-abc.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T25
+description: Argument is RegExp('[a-z]'), and instance is String("abc")
+---*/
+
+var __string = new String("abc");
+
+var __re = new RegExp('[a-z]');
+
+var __split = __string.split(__re);
+
+var __expected = ["", "", "", ""];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-a-z-and-instance-is-string-abc.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-a-z-and-instance-is-string-abc.js
new file mode 100644
index 0000000000..9540daed46
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-a-z-and-instance-is-string-abc.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T24
+description: Argument is regexp /[a-z]/, and instance is String("abc")
+---*/
+
+var __string = new String("abc");
+
+var __re = /[a-z]/;
+
+var __split = __string.split(__re);
+
+var __expected = ["", "", "", ""];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-and-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-and-instance-is-number.js
new file mode 100644
index 0000000000..bc958c246d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-and-instance-is-number.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T17
+description: Argument is regexp, and instance is Number
+---*/
+
+var __re = /\u0037\u0037/g;
+
+Number.prototype.split = String.prototype.split;
+
+var __split = (6776767677.006771122677555).split(__re);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 4, 'The value of __split.length is 4');
+assert.sameValue(__split[0], "6", 'The value of __split[0] is "6"');
+assert.sameValue(__split[1], "67676", 'The value of __split[1] is "67676"');
+assert.sameValue(__split[2], ".006", 'The value of __split[2] is ".006"');
+assert.sameValue(__split[3], "1", 'The value of __split[3] is "1"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-d-and-instance-is-string-dfe23iu-34-65.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-d-and-instance-is-string-dfe23iu-34-65.js
new file mode 100644
index 0000000000..2d5e255a69
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-d-and-instance-is-string-dfe23iu-34-65.js
@@ -0,0 +1,50 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T22
+description: >
+    Argument is regexp /\d+/, and instance is String("dfe23iu 34
+    =+65--")
+---*/
+
+var __string = new String("dfe23iu 34 =+65--");
+
+var __re = /\d+/;
+
+var __split = __string.split(__re);
+
+var __expected = ["dfe", "iu ", " =+", "--"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-l-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-l-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..3b8db5c5e1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-l-and-instance-is-string-hello.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T1
+description: Argument is regexp /l/, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 3, 'The value of __split.length is 3');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+assert.sameValue(__split[2], "o", 'The value of __split[2] is "o"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-reg-exp-d-and-instance-is-string-dfe23iu-34-65.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-reg-exp-d-and-instance-is-string-dfe23iu-34-65.js
new file mode 100644
index 0000000000..15e6940007
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-reg-exp-d-and-instance-is-string-dfe23iu-34-65.js
@@ -0,0 +1,50 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T23
+description: >
+    Argument is regexp RegExp('\\d+'), and instance is String("dfe23iu
+    34 =+65--")
+---*/
+
+var __string = new String("dfe23iu 34 =+65--");
+
+var __re = new RegExp('\\d+');
+
+var __split = __string.split(__re);
+
+var __expected = ["dfe", "iu ", " =+", "--"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-s-and-instance-is-string-a-b-c-de-f.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-s-and-instance-is-string-a-b-c-de-f.js
new file mode 100644
index 0000000000..88d2d09181
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-s-and-instance-is-string-a-b-c-de-f.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T19
+description: Argument is regexp /\s/, and instance is String("a b c de f")
+---*/
+
+var __string = new String("a b c de f");
+
+var __re = /\s/;
+
+var __split = __string.split(__re);
+
+var __expected = ["a", "b", "c", "de", "f"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-x-and-instance-is-string-a-b-c-de-f.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-x-and-instance-is-string-a-b-c-de-f.js
new file mode 100644
index 0000000000..cdc71fda05
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-regexp-x-and-instance-is-string-a-b-c-de-f.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T21
+description: Argument is regexp /\X/, and instance is String("a b c de f")
+---*/
+
+var __string = new String("a b c de f");
+
+var __re = /X/;
+
+var __split = __string.split(__re);
+
+var __expected = ["a b c de f"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-undefined-and-instance-is-string.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-undefined-and-instance-is-string.js
new file mode 100644
index 0000000000..654318a985
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-undefined-and-instance-is-string.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T7
+description: Argument is undefined, and instance is String
+---*/
+
+var __split = String("undefinedd").split(undefined);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "undefinedd", 'The value of __split[0] is "undefinedd"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/argument-is-void-0-and-instance-is-string-object-object-have-overrided-to-string-function.js b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-void-0-and-instance-is-string-object-object-have-overrided-to-string-function.js
new file mode 100644
index 0000000000..56ba974fa2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/argument-is-void-0-and-instance-is-string-object-object-have-overrided-to-string-function.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T8
+description: >
+    Argument is void 0, and instance is String(object), object have
+    overrided toString function
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+var __split = String(__obj).split(void 0);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "undefined", 'The value of __split[0] is "undefined"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-boolean-expression-function-call-and-null-and-instance-is-boolean.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-boolean-expression-function-call-and-null-and-instance-is-boolean.js
new file mode 100644
index 0000000000..d92c21c4b4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-boolean-expression-function-call-and-null-and-instance-is-boolean.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T2
+description: >
+    Arguments are boolean expression, function call and null, and
+    instance is Boolean
+---*/
+
+var __instance = new Boolean;
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split("A" !== "\u0041", function() {
+  return 0;
+}(), null);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 0, 'The value of __split.length is 0');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-false-and-true-and-instance-is-object.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-false-and-true-and-instance-is-object.js
new file mode 100644
index 0000000000..c5206d2e4e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-false-and-true-and-instance-is-object.js
@@ -0,0 +1,31 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T1
+description: Arguments are false and true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split(true, false);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 0, 'The value of __split.length is 0');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-0-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-0-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..bd92f4ec0b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-0-and-instance-is-string-hello.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T11
+description: Arguments are new RegExp and 0, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, 0);
+
+var __expected = [];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-1-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-1-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..a00eb4d15e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-1-and-instance-is-string-hello.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T12
+description: Arguments are new RegExp and 1, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, 1);
+
+var __expected = ["h"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-2-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-2-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..fbb5b9b0be
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-2-and-instance-is-string-hello.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T13
+description: Arguments are new RegExp and 2, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, 2);
+
+var __expected = ["h", "e"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-3-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-3-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..f4b454e7a2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-3-and-instance-is-string-hello.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T14
+description: Arguments are new RegExp and 3, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, 3);
+
+var __expected = ["h", "e", "l"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-4-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-4-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..1aa2db70d9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-4-and-instance-is-string-hello.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T15
+description: Arguments are new RegExp and 4, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, 4);
+
+var __expected = ["h", "e", "l", "l"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-hi-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-hi-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..3d3f2779fa
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-hi-and-instance-is-string-hello.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T18
+description: Arguments are new RegExp and "hi", and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, "hi");
+
+var __expected = [];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-undefined-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-undefined-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..a74349e475
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-undefined-and-instance-is-string-hello.js
@@ -0,0 +1,50 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T17
+description: >
+    Arguments are new RegExp and undefined, and instance is
+    String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, undefined);
+
+var __expected = ["h", "e", "l", "l", "o"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-void-0-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-void-0-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..805d58c864
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-new-reg-exp-and-void-0-and-instance-is-string-hello.js
@@ -0,0 +1,50 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T16
+description: >
+    Arguments are new RegExp and void 0, and instance is
+    String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = new RegExp;
+
+var __split = __string.split(__re, void 0);
+
+var __expected = ["h", "e", "l", "l", "o"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-0-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-0-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..15ca404c65
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-0-and-instance-is-string-hello.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T2
+description: Arguments are regexp /l/ and 0, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, 0);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 0, 'The value of __split.length is 0');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-1-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-1-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..ddf4d9d37e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-1-and-instance-is-string-hello.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T3
+description: Arguments are regexp /l/ and 1, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, 1);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-2-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-2-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..22892d3772
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-2-and-instance-is-string-hello.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T4
+description: Arguments are regexp /l/ and 2, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, 2);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-3-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-3-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..4dab82db93
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-3-and-instance-is-string-hello.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T5
+description: Arguments are regexp /l/ and 3, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, 3);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 3, 'The value of __split.length is 3');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+assert.sameValue(__split[2], "o", 'The value of __split[2] is "o"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-4-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-4-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..aecc5cee2b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-4-and-instance-is-string-hello.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T6
+description: Arguments are regexp /l/ and 4, and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, 4);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 3, 'The value of __split.length is 3');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+assert.sameValue(__split[2], "o", 'The value of __split[2] is "o"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-hi-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-hi-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..6ae072cb74
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-hi-and-instance-is-string-hello.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T8
+description: Arguments are regexp /l/ and "hi", and instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, "hi");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 0, 'The value of __split.length is 0');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-undefined-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-undefined-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..596e6c669b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-undefined-and-instance-is-string-hello.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T9
+description: >
+    Arguments are regexp /l/ and undefined, and instance is
+    String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, undefined);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 3, 'The value of __split.length is 3');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+assert.sameValue(__split[2], "o", 'The value of __split[2] is "o"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-void-0-and-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-void-0-and-instance-is-string-hello.js
new file mode 100644
index 0000000000..af5121e832
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-l-and-void-0-and-instance-is-string-hello.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T7
+description: >
+    Arguments are regexp /l/ and void 0, and instance is
+    String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __re = /l/;
+
+var __split = __string.split(__re, void 0);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 3, 'The value of __split.length is 3');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+assert.sameValue(__split[2], "o", 'The value of __split[2] is "o"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-s-and-3-and-instance-is-string-a-b-c-de-f.js b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-s-and-3-and-instance-is-string-a-b-c-de-f.js
new file mode 100644
index 0000000000..dfad06efc0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/arguments-are-regexp-s-and-3-and-instance-is-string-a-b-c-de-f.js
@@ -0,0 +1,50 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. If separator is a regular expression then
+    inside of SplitMatch helper the [[Match]] method of R is called giving it the arguments corresponding
+es5id: 15.5.4.14_A4_T20
+description: >
+    Arguments are regexp /\s/ and 3, and instance is String("a b c de
+    f")
+---*/
+
+var __string = new String("a b c de f");
+
+var __re = /\s/;
+
+var __split = __string.split(__re, 3);
+
+var __expected = ["a", "b", "c"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/browser.js b/js/src/tests/test262/built-ins/String/prototype/split/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-0-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-0-instance-is-number.js
new file mode 100644
index 0000000000..32c3cb4fd2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-0-instance-is-number.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T32
+description: Call split(1,0), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, 0);
+
+var __expected = [];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-1-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-1-instance-is-number.js
new file mode 100644
index 0000000000..a90b9f50a0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-1-instance-is-number.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T30
+description: Call split(1,1), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, 1);
+
+var __expected = [""];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-100-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-100-instance-is-number.js
new file mode 100644
index 0000000000..dcbf89d5f9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-100-instance-is-number.js
@@ -0,0 +1,49 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T33
+description: Call split(1,100), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, 100);
+
+var __expected = ["", "00", "", "", "", "22", "33", "44", "60"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-2-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-2-instance-is-number.js
new file mode 100644
index 0000000000..f47b60b4fb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-2-instance-is-number.js
@@ -0,0 +1,49 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T31
+description: Call split(1,2), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, 2);
+
+var __expected = ["", "00"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-boo-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-boo-instance-is-number.js
new file mode 100644
index 0000000000..1287bfd97c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-boo-instance-is-number.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T36
+description: Call split(1,"boo"), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, "boo");
+
+var __expected = [];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-instance-is-number.js
new file mode 100644
index 0000000000..58f39573fe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-instance-is-number.js
@@ -0,0 +1,49 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T29
+description: Call split(1), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1);
+
+var __expected = ["", "00", "", "", "", "22", "33", "44", "60"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-math-pow-2-32-1-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-math-pow-2-32-1-instance-is-number.js
new file mode 100644
index 0000000000..f651f80262
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-math-pow-2-32-1-instance-is-number.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T37
+description: Call split(1,-Math.pow(2,32)+1), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, -Math.pow(2, 32) + 1);
+
+var __expected = [""];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-void-0-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-void-0-instance-is-number.js
new file mode 100644
index 0000000000..f60ded8079
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-1-void-0-instance-is-number.js
@@ -0,0 +1,49 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T34
+description: Call split(1,void 0), instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, void 0);
+
+var __expected = ["", "00", "", "", "", "22", "33", "44", "60"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-123-instance-is-this123is123a123string123object.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-123-instance-is-this123is123a123string123object.js
new file mode 100644
index 0000000000..d524ed8d4e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-123-instance-is-this123is123a123string123object.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T10
+description: Call split(123), instance is "this123is123a123string123object"
+---*/
+
+var __string = "this123is123a123string123object";
+var __expected = ["this", "is", "a", "string", "object"];
+
+var __split = __string.split(123);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var i = 0; i < __expected.length; i++) {
+  assert.sameValue(__expected[i], __split[i], 'The value of __expected[i] is expected to equal the value of __split[i]');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-2-instance-is-string-one-two-three-four-five.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-2-instance-is-string-one-two-three-four-five.js
new file mode 100644
index 0000000000..99c67b6595
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-2-instance-is-string-one-two-three-four-five.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T3
+description: Call split(/ /,2), instance is String("one two three four five")
+---*/
+
+var __string = new String("one two three four five");
+
+var __split = __string.split(/ /, 2);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "one", 'The value of __split[0] is "one"');
+assert.sameValue(__split[1], "two", 'The value of __split[1] is "two"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-4-instance-is-string-one-1-two-2-four-4.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-4-instance-is-string-one-1-two-2-four-4.js
new file mode 100644
index 0000000000..2df56a28ea
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-4-instance-is-string-one-1-two-2-four-4.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T13
+description: Call split("-4"), instance is String("one-1 two-2 four-4")
+---*/
+
+var __string = new String("one-1 two-2 four-4");
+
+var __split = __string.split("-4");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "one-1 two-2 four", 'The value of __split[0] is "one-1 two-2 four"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-h-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-h-instance-is-string-hello.js
new file mode 100644
index 0000000000..162fbfb2a1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-h-instance-is-string-hello.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T24
+description: Call split("h"), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split("h");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+assert.sameValue(__split[1], "ello", 'The value of __split[1] is "ello"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-hello-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-hello-instance-is-string-hello.js
new file mode 100644
index 0000000000..0765fa6752
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-hello-instance-is-string-hello.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T26
+description: Call split("hello"), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split("hello");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-hellothere-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-hellothere-instance-is-string-hello.js
new file mode 100644
index 0000000000..8eac8b824b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-hellothere-instance-is-string-hello.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T28
+description: Call split("hellothere"), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split("hellothere");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "hello", 'The value of __split[0] is "hello"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-empty-string-object.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-empty-string-object.js
new file mode 100644
index 0000000000..cbb3024480
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-empty-string-object.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T16
+description: Call split(" "), instance is empty String object
+---*/
+
+var __string = new String();
+
+var __split = __string.split(" ");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-1-two-2-four-4.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-1-two-2-four-4.js
new file mode 100644
index 0000000000..90c30450fd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-1-two-2-four-4.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T6
+description: Call split(''), instance is String("one-1 two-2 four-4")
+---*/
+
+var __string = new String("one-1 two-2 three-3");
+
+var __split = __string.split('');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __string.length,
+  'The value of __split.length is expected to equal the value of __string.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var i = 0; i < __string.length; i++) {
+  assert.sameValue(
+    __split[i],
+    __string.charAt(i),
+    'The value of __split[i] must return the same value returned by __string.charAt(i)'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three-four-five.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three-four-five.js
new file mode 100644
index 0000000000..597a35aca5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three-four-five.js
@@ -0,0 +1,31 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T2
+description: Call split(" "), instance is String("one two three four five")
+---*/
+
+var __string = new String("one two three four five");
+
+var __split = __string.split(" ");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 5, 'The value of __split.length is 5');
+assert.sameValue(__split[0], "one", 'The value of __split[0] is "one"');
+assert.sameValue(__split[1], "two", 'The value of __split[1] is "two"');
+assert.sameValue(__split[2], "three", 'The value of __split[2] is "three"');
+assert.sameValue(__split[3], "four", 'The value of __split[3] is "four"');
+assert.sameValue(__split[4], "five", 'The value of __split[4] is "five"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three.js
new file mode 100644
index 0000000000..d61e224c40
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string-one-two-three.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T4
+description: Call split(""), instance is String("one two three")
+---*/
+
+var __string = new String("one two three");
+
+var __split = __string.split("");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __string.length,
+  'The value of __split.length is expected to equal the value of __string.length'
+);
+
+assert.sameValue(__split[0], "o", 'The value of __split[0] is "o"');
+assert.sameValue(__split[1], "n", 'The value of __split[1] is "n"');
+assert.sameValue(__split[11], "e", 'The value of __split[11] is "e"');
+assert.sameValue(__split[12], "e", 'The value of __split[12] is "e"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string.js
new file mode 100644
index 0000000000..a556e496fe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-instance-is-string.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T18
+description: Call split(" "), instance is String(" ")
+---*/
+
+var __string = new String(" ");
+
+var __split = __string.split(" ");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-0-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-0-instance-is-string-hello.js
new file mode 100644
index 0000000000..de4c6c8d6c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-0-instance-is-string-hello.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T39
+description: Call split("l",0), instance is String("hello")
+---*/
+
+var __instance = new String("hello");
+
+var __split = __instance.split("l", 0);
+
+var __expected = [];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-1-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-1-instance-is-string-hello.js
new file mode 100644
index 0000000000..aaf146be6c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-1-instance-is-string-hello.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T40
+description: Call split("l",1), instance is String("hello")
+---*/
+
+var __instance = new String("hello");
+
+var __split = __instance.split("l", 1);
+
+var __expected = ["he"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-2-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-2-instance-is-string-hello.js
new file mode 100644
index 0000000000..aa693ae1e5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-2-instance-is-string-hello.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T41
+description: Call split("l",2), instance is String("hello")
+---*/
+
+var __instance = new String("hello");
+
+var __split = __instance.split("l", 2);
+
+var __expected = ["he", ""];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-3-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-3-instance-is-string-hello.js
new file mode 100644
index 0000000000..34d4facb2c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-3-instance-is-string-hello.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T42
+description: Call split("l",3), instance is String("hello")
+---*/
+
+var __instance = new String("hello");
+
+var __split = __instance.split("l", 3);
+
+var __expected = ["he", "", "o"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-4-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-4-instance-is-string-hello.js
new file mode 100644
index 0000000000..b8606c4453
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-4-instance-is-string-hello.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T43
+description: Call split("l",4), instance is String("hello")
+---*/
+
+var __instance = new String("hello");
+
+var __split = __instance.split("l", 4);
+
+var __expected = ["he", "", "o"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-instance-is-string-hello.js
new file mode 100644
index 0000000000..7b0be6c939
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-instance-is-string-hello.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T22
+description: Call split("l"), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split("l");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 3, 'The value of __split.length is 3');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+assert.sameValue(__split[2], "o", 'The value of __split[2] is "o"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-na-n-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-na-n-instance-is-string-hello.js
new file mode 100644
index 0000000000..4d436b2eac
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-l-na-n-instance-is-string-hello.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T38
+description: Call split("l",NaN), instance is String("hello")
+---*/
+
+var __instance = new String("hello");
+
+var __split = __instance.split("l", NaN);
+
+var __expected = [];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+assert.sameValue(__split[0], __expected[0], 'The value of __split[0] is expected to equal the value of __expected[0]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-ll-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-ll-instance-is-string-hello.js
new file mode 100644
index 0000000000..7cbe9035a9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-ll-instance-is-string-hello.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T21
+description: Call split("ll"), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split("ll");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "he", 'The value of __split[0] is "he"');
+assert.sameValue(__split[1], "o", 'The value of __split[1] is "o"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-new-reg-exp.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-new-reg-exp.js
new file mode 100644
index 0000000000..fbc4612a4a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-new-reg-exp.js
@@ -0,0 +1,41 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T20
+description: Call split(new RegExp)
+---*/
+
+var __string = new String("one-1 two-2 three-3");
+
+var __split = __string.split(new RegExp);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __string.length,
+  'The value of __split.length is expected to equal the value of __string.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var i = 0; i < __string.length; i++) {
+  assert.sameValue(__string.charAt(i), __split[i], '__string.charAt("0") must return the value of __split[i]');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-null-instance-is-thisnullisnullanullstringnullobject.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-null-instance-is-thisnullisnullanullstringnullobject.js
new file mode 100644
index 0000000000..1a3545c568
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-null-instance-is-thisnullisnullanullstringnullobject.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T8
+description: Call split(null), instance is "thisnullisnullanullstringnullobject"
+---*/
+
+var __string = "thisnullisnullanullstringnullobject";
+var __expected = ["this", "is", "a", "string", "object"];
+
+var __split = __string.split(null);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var i = 0; i < __expected.length; i++) {
+  assert.sameValue(__expected[i], __split[i], 'The value of __expected[i] is expected to equal the value of __split[i]');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-o-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-o-instance-is-string-hello.js
new file mode 100644
index 0000000000..3fcd338fb0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-o-instance-is-string-hello.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T25
+description: Call split("o"), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split("o");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "hell", 'The value of __split[0] is "hell"');
+assert.sameValue(__split[1], "", 'The value of __split[1] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-on-instance-is-string-one-1-two-2-four-4.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-on-instance-is-string-one-1-two-2-four-4.js
new file mode 100644
index 0000000000..4feaf246c3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-on-instance-is-string-one-1-two-2-four-4.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T14
+description: Call split("on"), instance is String("one-1 two-2 four-4")
+---*/
+
+var __string = new String("one-1 two-2 four-4");
+
+var __split = __string.split("on");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+assert.sameValue(__split[1], "e-1 two-2 four-4", 'The value of __split[1] is "e-1 two-2 four-4"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-r-42-instance-is-string-one-1-two-2-four-4.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-r-42-instance-is-string-one-1-two-2-four-4.js
new file mode 100644
index 0000000000..edd19b05df
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-r-42-instance-is-string-one-1-two-2-four-4.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T12
+description: Call split("r-42"), instance is String("one-1 two-2 four-4")
+---*/
+
+var __string = new String("one-1 two-2 four-4");
+
+var __split = __string.split("r-42");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "one-1 two-2 four-4", 'The value of __split[0] is "one-1 two-2 four-4"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-true-instance-is-thistrueistrueatruestringtrueobject.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-true-instance-is-thistrueistrueatruestringtrueobject.js
new file mode 100644
index 0000000000..e57db41e19
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-true-instance-is-thistrueistrueatruestringtrueobject.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T9
+description: Call split(true), instance is "thistrueistrueatruestringtrueobject"
+---*/
+
+var __string = "thistrueistrueatruestringtrueobject";
+var __expected = ["this", "is", "a", "string", "object"];
+
+var __split = __string.split(true);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var i = 0; i < __expected.length; i++) {
+  assert.sameValue(__expected[i], __split[i], 'The value of __expected[i] is expected to equal the value of __split[i]');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-undefined-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-undefined-instance-is-string-hello.js
new file mode 100644
index 0000000000..42f31b038a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-undefined-instance-is-string-hello.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T27
+description: Call split(undefined), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split(undefined);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "hello", 'The value of __split[0] is "hello"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-void-0-instance-is-thisundefinedisundefinedaundefinedstringundefinedobject.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-void-0-instance-is-thisundefinedisundefinedaundefinedstringundefinedobject.js
new file mode 100644
index 0000000000..a1b9436924
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-void-0-instance-is-thisundefinedisundefinedaundefinedstringundefinedobject.js
@@ -0,0 +1,44 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T7
+description: >
+    Call split(void 0), instance is
+    "thisundefinedisundefinedaundefinedstringundefinedobject"
+---*/
+
+var __string = "thisundefinedisundefinedaundefinedstringundefinedobject";
+var __expected = [__string];
+
+var __split = __string.split(void 0);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var i = 0; i < __expected.length; i++) {
+  assert.sameValue(__expected[i], __split[i], 'The value of __expected[i] is expected to equal the value of __split[i]');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-without-arguments-and-instance-is-empty-string.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-without-arguments-and-instance-is-empty-string.js
new file mode 100644
index 0000000000..5b60299418
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-without-arguments-and-instance-is-empty-string.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T4
+description: Call split without arguments, and instance is empty string
+---*/
+
+//since ToString() evaluates to "" split() evaluates to split("",0)
+var __split = "".split();
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-x-instance-is-empty-string.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-x-instance-is-empty-string.js
new file mode 100644
index 0000000000..ef00d33da6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-x-instance-is-empty-string.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T19
+description: Call split("x"), instance is empty string
+---*/
+
+var __string = "";
+
+var __split = __string.split("x");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/call-split-x-instance-is-string-hello.js b/js/src/tests/test262/built-ins/String/prototype/split/call-split-x-instance-is-string-hello.js
new file mode 100644
index 0000000000..da2544c959
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/call-split-x-instance-is-string-hello.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T23
+description: Call split("x"), instance is String("hello")
+---*/
+
+var __string = new String("hello");
+
+var __split = __string.split("x");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "hello", 'The value of __split[0] is "hello"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/checking-by-using-eval.js b/js/src/tests/test262/built-ins/String/prototype/split/checking-by-using-eval.js
new file mode 100644
index 0000000000..f7a4cbd146
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/checking-by-using-eval.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T3
+description: Checking by using eval
+---*/
+
+var split = String.prototype.split.bind(this);
+
+var __obj__lim = {
+  valueOf: function() {
+    return 5;
+  }
+};
+
+try {
+  toString = Object.prototype.toString;
+} catch (e) {;
+}
+
+//Checks are only valid if we can overwrite the global object's toString method
+//(which ES5 doesn't even require to exist)
+if (toString === Object.prototype.toString) {
+  var __class__ = toString();
+
+  var __split = split(eval("\"[\""), __obj__lim);
+
+  assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+  assert.sameValue(
+    __split.constructor,
+    Array,
+    'The value of __split.constructor is expected to equal the value of Array'
+  );
+
+  assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+  assert.sameValue(__split[1].substring(0, 6), "object", '__split[1].substring(0, 6) must return "object"');
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/checking-if-creating-the-string-prototype-split-object-fails.js b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-creating-the-string-prototype-split-object-fails.js
new file mode 100644
index 0000000000..64f6ca94e7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-creating-the-string-prototype-split-object-fails.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.split can't be used as constructor
+es5id: 15.5.4.14_A7
+description: Checking if creating the String.prototype.split object fails
+---*/
+
+var __FACTORY = String.prototype.split;
+
+try {
+  var __instance = new __FACTORY;
+  Test262Error.thrower('#1: __FACTORY = String.prototype.split; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if (e instanceof Test262Error) {
+    throw e;
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/checking-if-deleting-the-string-prototype-split-length-property-fails.js b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-deleting-the-string-prototype-split-length-property-fails.js
new file mode 100644
index 0000000000..fb4decb365
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-deleting-the-string-prototype-split-length-property-fails.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.split.length property does not have the attribute
+    DontDelete
+es5id: 15.5.4.14_A9
+description: >
+    Checking if deleting the String.prototype.split.length property
+    fails
+---*/
+
+assert(
+  String.prototype.split.hasOwnProperty('length'),
+  'String.prototype.split.hasOwnProperty(\'length\') must return true'
+);
+
+assert(delete String.prototype.split.length, 'The value of `delete String.prototype.split.length` is true');
+
+assert(
+  !String.prototype.split.hasOwnProperty('length'),
+  'The value of `!String.prototype.split.hasOwnProperty(\'length\')` is true'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/checking-if-enumerating-the-string-prototype-split-length-property-fails.js b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-enumerating-the-string-prototype-split-length-property-fails.js
new file mode 100644
index 0000000000..a71e5c4d21
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-enumerating-the-string-prototype-split-length-property-fails.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.split.length property has the attribute DontEnum
+es5id: 15.5.4.14_A8
+description: >
+    Checking if enumerating the String.prototype.split.length property
+    fails
+---*/
+
+assert(
+  String.prototype.split.hasOwnProperty('length'),
+  'String.prototype.split.hasOwnProperty(\'length\') must return true'
+);
+
+assert(
+  !String.prototype.split.propertyIsEnumerable('length'),
+  'The value of `!String.prototype.split.propertyIsEnumerable(\'length\')` is true'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.split) {
+  if (p === "length") {
+    count++;
+  }
+}
+
+assert.sameValue(count, 0, 'The value of `count` is 0');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/checking-if-varying-the-string-prototype-split-length-property-fails.js b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-varying-the-string-prototype-split-length-property-fails.js
new file mode 100644
index 0000000000..0e44e7df62
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/checking-if-varying-the-string-prototype-split-length-property-fails.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.split.length property has the attribute ReadOnly
+es5id: 15.5.4.14_A10
+description: >
+    Checking if varying the String.prototype.split.length property
+    fails
+includes: [propertyHelper.js]
+---*/
+
+assert(
+  String.prototype.split.hasOwnProperty('length'),
+  'String.prototype.split.hasOwnProperty(\'length\') must return true'
+);
+
+var __obj = String.prototype.split.length;
+
+verifyNotWritable(String.prototype.split, "length", null, function() {
+  return "shifted";
+});
+
+assert.sameValue(
+  String.prototype.split.length,
+  __obj,
+  'The value of String.prototype.split.length is expected to equal the value of __obj'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/checking-string-prototype-split-length.js b/js/src/tests/test262/built-ins/String/prototype/split/checking-string-prototype-split-length.js
new file mode 100644
index 0000000000..41a0089525
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/checking-string-prototype-split-length.js
@@ -0,0 +1,17 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the split method is 2
+es5id: 15.5.4.14_A11
+description: Checking String.prototype.split.length
+---*/
+
+assert(
+  String.prototype.split.hasOwnProperty("length"),
+  'String.prototype.split.hasOwnProperty("length") must return true'
+);
+
+assert.sameValue(String.prototype.split.length, 2, 'The value of String.prototype.split.length is 2');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/checking-string-prototype-split-prototype.js b/js/src/tests/test262/built-ins/String/prototype/split/checking-string-prototype-split-prototype.js
new file mode 100644
index 0000000000..fcf1b1d93c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/checking-string-prototype-split-prototype.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.split has not prototype property
+es5id: 15.5.4.14_A6
+description: Checking String.prototype.split.prototype
+---*/
+
+assert.sameValue(
+  String.prototype.split.prototype,
+  undefined,
+  'The value of String.prototype.split.prototype is expected to equal `undefined`'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-get-err.js b/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-get-err.js
new file mode 100644
index 0000000000..770a8094d9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-get-err.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Behavior when error is thrown accessing @@split property
+es6id: 21.1.3.17
+info: |
+    [...]
+    3. If separator is neither undefined nor null, then
+       a. Let splitter be GetMethod(separator, @@split).
+       b. ReturnIfAbrupt(splitter).
+features: [Symbol.split]
+---*/
+
+var poisonedSplit = {};
+Object.defineProperty(poisonedSplit, Symbol.split, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.split(poisonedSplit);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-invocation.js b/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-invocation.js
new file mode 100644
index 0000000000..87c0abb7b3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-invocation.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Invocation of @@split property of user-supplied objects
+es6id: 21.1.3.17
+info: |
+    [...]
+    3. If separator is neither undefined nor null, then
+       a. Let splitter be GetMethod(separator, @@split).
+       b. ReturnIfAbrupt(splitter).
+       c. If splitter is not undefined, then
+          i. Return Call(splitter, separator, «O, limit»).
+features: [Symbol.split]
+---*/
+
+var separator = {};
+var returnVal = {};
+var callCount = 0;
+var thisVal, args;
+
+separator[Symbol.split] = function() {
+  callCount += 1;
+  thisVal = this;
+  args = arguments;
+  return returnVal;
+};
+
+assert.sameValue(''.split(separator, 'limit'), returnVal);
+assert.sameValue(thisVal, separator);
+assert.notSameValue(args, undefined);
+assert.sameValue(args.length, 2);
+assert.sameValue(args[0], '');
+assert.sameValue(args[1], 'limit');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-is-null.js b/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-is-null.js
new file mode 100644
index 0000000000..07f3976264
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/cstm-split-is-null.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.split
+description: >
+  If separator's Symbol.split property is null, no error is thrown.
+info: |
+  String.prototype.split ( separator, limit )
+
+  [...]
+  2. If separator is neither undefined nor null, then
+    a. Let splitter be ? GetMethod(separator, @@split).
+    b. If splitter is not undefined, then
+      [...]
+  [...]
+  17. Return A.
+
+  GetMethod ( V, P )
+
+  [...]
+  2. Let func be ? GetV(V, P).
+  3. If func is either undefined or null, return undefined.
+includes: [compareArray.js]
+features: [Symbol.split]
+---*/
+
+var separator = {};
+separator[Symbol.split] = null;
+separator.toString = function() { return "2"; };
+separator.valueOf = function() { throw new Test262Error("should not be called"); };
+
+assert.compareArray("a2b2c".split(separator), ["a", "b", "c"]);
+assert.compareArray("a2b2c".split(separator, 1), ["a"]);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-array-1-2-3-4-5.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-array-1-2-3-4-5.js
new file mode 100644
index 0000000000..3228841a91
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-array-1-2-3-4-5.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T8
+description: Instance is Array(1,2,3,4,5)
+---*/
+
+var __instance = new Array(1, 2, 3, 4, 5);
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "1,2,3,4,5", 'The value of __split[0] is "1,2,3,4,5"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-boolean.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-boolean.js
new file mode 100644
index 0000000000..27132ca436
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-boolean.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T9
+description: Instance is Boolean
+---*/
+
+var __instance = new Boolean;
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "false", 'The value of __split[0] is "false"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-function.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-function.js
new file mode 100644
index 0000000000..c3b28fe210
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-function.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T3
+description: Instance is function(){}
+---*/
+
+var __instance = {
+  toString: function() {
+    return "function(){}";
+  }
+};
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0].substring(0, 8), "function", '__split[0].substring(0, 8) must return "function"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-math.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-math.js
new file mode 100644
index 0000000000..8c5416f0de
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-math.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T7
+description: Instance is Math
+---*/
+
+var __instance = Math;
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "[object Math]", 'The value of __split[0] is "[object Math]"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-new-string.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-new-string.js
new file mode 100644
index 0000000000..e614af44c8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-new-string.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T10
+description: Instance is new String
+---*/
+
+var __string = new String;
+
+var __split = __string.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "", 'The value of __split[0] is ""');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-1234567890.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-1234567890.js
new file mode 100644
index 0000000000..71743f45e5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-1234567890.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T5
+description: Instance is Number(-1234567890)
+---*/
+
+var __instance = new Number(-1234567890);
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "-1234567890", 'The value of __split[0] is "-1234567890"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-1e21.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-1e21.js
new file mode 100644
index 0000000000..7ee929e935
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-1e21.js
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T6
+description: Instance is Number(-1e21)
+---*/
+
+var __instance = new Number(-1e21);
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+
+assert.sameValue(
+  __split[0],
+  __instance.toString(),
+  'The value of __split[0] must return the same value returned by __instance.toString()'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-na-n.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-na-n.js
new file mode 100644
index 0000000000..e363c7247c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-number-na-n.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T4
+description: Instance is Number(NaN)
+---*/
+
+var __instance = new Number(NaN);
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "NaN", 'The value of __split[0] is "NaN"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-object.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-object.js
new file mode 100644
index 0000000000..37702d2b8d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-object.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T2
+description: Instance is Object()
+---*/
+
+var __instance = new Object();
+
+__instance.split = String.prototype.split;
+
+var __split = __instance.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "[object Object]", 'The value of __split[0] is "[object Object]"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-string-one-two-three-four-five.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-string-one-two-three-four-five.js
new file mode 100644
index 0000000000..691c02e134
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-string-one-two-three-four-five.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T1
+description: Instance is String("one,two,three,four,five")
+---*/
+
+var __string = new String("one,two,three,four,five");
+
+var __split = __string.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "one,two,three,four,five", 'The value of __split[0] is "one,two,three,four,five"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/instance-is-string.js b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-string.js
new file mode 100644
index 0000000000..0f14e2df1c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/instance-is-string.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split() returns an Array object with:
+    i) length equaled to 1,
+    ii) [[Get]](0) equaled to the result of converting this object to a string
+es5id: 15.5.4.14_A3_T11
+description: Instance is String(" ")
+---*/
+
+var __string = new String(" ");
+
+var __split = __string.split();
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], " ", 'The value of __split[0] is " "');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/limit-touint32-error.js b/js/src/tests/test262/built-ins/String/prototype/split/limit-touint32-error.js
new file mode 100644
index 0000000000..69435c390f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/limit-touint32-error.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2020 Richard Gibson. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: Abrupt completion from ToUint32 on the limit
+info: |
+  1. If _limit_ is *undefined*, let _lim_ be 2<sup>32</sup> - 1; else let _lim_ be ? ToUint32(_limit_).
+  1. Let _R_ be ? ToString(_separator_).
+  1. If _lim_ = 0, return _A_.
+features: [Symbol, Symbol.toPrimitive]
+---*/
+
+function ExpectedError(message) {
+  this.message = message || "";
+}
+ExpectedError.prototype.toString = function () {
+  return "ExpectedError: " + this.message;
+};
+
+var nonStringableSeparator = {};
+nonStringableSeparator[Symbol.toPrimitive] =
+  function() { throw new Test262Error("separator[Symbol.toPrimitive]"); };
+nonStringableSeparator.toString = function() { throw new Test262Error("separator.toString"); };
+nonStringableSeparator.valueOf = function() { throw new Test262Error("separator.valueOf"); };
+
+var nonNumberableLimit = {};
+nonNumberableLimit[Symbol.toPrimitive] = function() { throw new ExpectedError(); };
+
+assert.throws(ExpectedError, function() {
+  "foo".split(nonStringableSeparator, nonNumberableLimit);
+}, 'ToUint32 should be called on the limit before ToString on the separator.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/name.js b/js/src/tests/test262/built-ins/String/prototype/split/name.js
new file mode 100644
index 0000000000..e5ab74fed8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.17
+description: >
+  String.prototype.split.name is "split".
+info: |
+  String.prototype.split ( separator, limit )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.split.name, "split");
+
+verifyNotEnumerable(String.prototype.split, "name");
+verifyNotWritable(String.prototype.split, "name");
+verifyConfigurable(String.prototype.split, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/split/not-a-constructor.js
new file mode 100644
index 0000000000..09e41d6233
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.split does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.split),
+  false,
+  'isConstructor(String.prototype.split) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.split();
+}, '`new String.prototype.split()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-colon-instance-is-string-one-1-two-2-four-4.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-colon-instance-is-string-one-1-two-2-four-4.js
new file mode 100644
index 0000000000..062d1ee45c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-colon-instance-is-string-one-1-two-2-four-4.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T11
+description: Separator colon, instance is String(\"one-1,two-2,four-4\")
+---*/
+
+var __string = new String("one-1,two-2,four-4");
+
+var __split = __string.split(":");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "one-1,two-2,four-4", 'The value of __split[0] is "one-1,two-2,four-4"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-comma-instance-is-string-one-two-three-four-five.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-comma-instance-is-string-one-two-three-four-five.js
new file mode 100644
index 0000000000..f8db39d4e3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-comma-instance-is-string-one-two-three-four-five.js
@@ -0,0 +1,31 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T1
+description: Separator comma, instance is String("one,two,three,four,five")
+---*/
+
+var __string = new String("one,two,three,four,five");
+
+var __split = __string.split(",");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 5, 'The value of __split.length is 5');
+assert.sameValue(__split[0], "one", 'The value of __split[0] is "one"');
+assert.sameValue(__split[1], "two", 'The value of __split[1] is "two"');
+assert.sameValue(__split[2], "three", 'The value of __split[2] is "three"');
+assert.sameValue(__split[3], "four", 'The value of __split[3] is "four"');
+assert.sameValue(__split[4], "five", 'The value of __split[4] is "five"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-empty-string-instance-is-string.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-empty-string-instance-is-string.js
new file mode 100644
index 0000000000..0eea79cbfc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-empty-string-instance-is-string.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T17
+description: Separator empty string, instance is String(" ")
+---*/
+
+var __string = new String(" ");
+
+var __split = __string.split("");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], " ", 'The value of __split[0] is " "');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-number-limit-math-pow-2-32-1-instance-is-number.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-number-limit-math-pow-2-32-1-instance-is-number.js
new file mode 100644
index 0000000000..0d35ed934f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-number-limit-math-pow-2-32-1-instance-is-number.js
@@ -0,0 +1,49 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T35
+description: Separator number, limit Math.pow(2,32)-1, instance is Number
+---*/
+
+var __instance = new Number(100111122133144155);
+
+Number.prototype.split = String.prototype.split;
+
+var __split = __instance.split(1, Math.pow(2, 32) - 1);
+
+var __expected = ["", "00", "", "", "", "22", "33", "44", "60"];
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(
+  __split.length,
+  __expected.length,
+  'The value of __split.length is expected to equal the value of __expected.length'
+);
+
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+for (var index = 0; index < __expected.length; index++) {
+  assert.sameValue(
+    __split[index],
+    __expected[index],
+    'The value of __split[index] is expected to equal the value of __expected[index]'
+  );
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-throws.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-throws.js
new file mode 100644
index 0000000000..574af6775f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-throws.js
@@ -0,0 +1,41 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T11
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided toString function.  Second object have overrided valueOf
+    function, that throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    throw "intointeger";
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.split(__obj, __obj2);
+  Test262Error.thrower('#1: "var x = __str.split(__obj, __obj2)" lead to throwing exception');
+} catch (e) {
+  assert.sameValue(e, "intointeger", 'The value of `e` is "intointeger"');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-tostring-throws.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-tostring-throws.js
new file mode 100644
index 0000000000..d4c3557476
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-tostring-throws.js
@@ -0,0 +1,44 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T12
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided toString function.  Second object have overrided valueOf
+    function and toString function, that throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    throw "intointeger";
+  }
+}
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.split(__obj, __obj2);
+  Test262Error.thrower('#1: "var x = __str.split(__obj, __obj2)" lead to throwing exception');
+} catch (e) {
+  assert.sameValue(e, "intointeger", 'The value of `e` is "intointeger"');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-tostring.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-tostring.js
new file mode 100644
index 0000000000..45c3b9f7a6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof-tostring.js
@@ -0,0 +1,46 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T13
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided toString function.  Second object have overrided valueOf
+    and toString functions
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0042\u0042";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    return "2";
+  }
+}
+
+var __split = "ABB\u0041BABAB\u0042cc^^\u0042Bvv%%B\u0042xxx".split(__obj, __obj2);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 2, 'The value of __split.length is 2');
+assert.sameValue(__split[0], "A", 'The value of __split[0] is "A"');
+assert.sameValue(__split[1], "ABABA", 'The value of __split[1] is "ABABA"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof.js
new file mode 100644
index 0000000000..b42b8beb4a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-limit-override-valueof.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T10
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided toString function.  Second object have overrided valueOf
+    function
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0042B";
+  }
+}
+var __obj2 = {
+  valueOf: function() {
+    return true;
+  }
+}
+var __str = "ABB\u0041BABAB";
+
+var __split = __str.split(__obj, __obj2);
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "A", 'The value of __split[0] is "A"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-throws-limit-override-valueof-throws.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-throws-limit-override-valueof-throws.js
new file mode 100644
index 0000000000..ccd53356db
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-tostring-throws-limit-override-valueof-throws.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T14
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided toString function, that throw exception.  Second object
+    have overrided valueOf function, that throw exception
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+};
+var __obj2 = {
+  valueOf: function() {
+    throw "intoint";
+  }
+};
+var __instance = new Number(10001.10001);
+Number.prototype.split = String.prototype.split;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __instance.split(__obj, __obj2);
+  Test262Error.thrower('#1: "var x = __instance.split(__obj, __obj2)" lead to throwing exception');
+} catch (e) {
+  assert.sameValue(e, "intoint", 'The value of `e` is "intoint"');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-override-valueof.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-valueof.js
new file mode 100644
index 0000000000..3e5852ac68
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-override-valueof.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T9
+description: >
+    Argument is function(){}(), and instance is String(object), object
+    have overrided toString and valueOf functions
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+//since ToString(undefined) evaluates to "undefined"
+var __split = new String(__obj).split(function() {}());
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "undefined", 'The value of __split[0] is "undefined"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp-comma-instance-is-string-one-1-two-2-four-4.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp-comma-instance-is-string-one-1-two-2-four-4.js
new file mode 100644
index 0000000000..05fc565ca7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp-comma-instance-is-string-one-1-two-2-four-4.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T5
+description: Separator /,/ (regexp comma), instance is String("one-1,two-2,four-4")
+---*/
+
+var __string = new String("one-1,two-2,four-4");
+
+var __split = __string.split(/,/);
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 3, 'The value of __split.length is 3');
+assert.sameValue(__split[0], "one-1", 'The value of __split[0] is "one-1"');
+assert.sameValue(__split[1], "two-2", 'The value of __split[1] is "two-2"');
+assert.sameValue(__split[2], "four-4", 'The value of __split[2] is "four-4"');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp-limit-string-via-eval.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp-limit-string-via-eval.js
new file mode 100644
index 0000000000..5bb6696c77
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp-limit-string-via-eval.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T18
+description: Separator regexp, limit string via eval
+---*/
+
+var __re = new RegExp("00");
+
+Number.prototype.split = String.prototype.split;
+
+var __split = (6776767677.006771122677555).split(__re, eval("\"1\""));
+
+assert.sameValue(typeof __split, "object", 'The value of `typeof __split` is "object"');
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 1, 'The value of __split.length is 1');
+assert.sameValue(__split[0], "6776767677.", 'The value of __split[0] is "6776767677."');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp.js
new file mode 100644
index 0000000000..3d5a6f9cc6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-regexp.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: Separator is a regexp
+info: |
+  String.prototype.split ( separator, limit )
+
+  If separator is neither undefined nor null, then
+    Let splitter be ? GetMethod(separator, @@split).
+    If splitter is not undefined, then
+      Return ? Call(splitter, separator, « O, limit »).
+
+  RegExp.prototype [ @@split ] ( string, limit )
+
+  Let C be ? SpeciesConstructor(rx, %RegExp%).
+
+includes: [compareArray.js]
+---*/
+
+assert.compareArray("x".split(/^/), ["x"], '"x".split(/^/) must return ["x"]');
+assert.compareArray("x".split(/$/), ["x"], '"x".split(/$/) must return ["x"]');
+assert.compareArray("x".split(/.?/), ["", ""], '"x".split(/.?/) must return ["", ""]');
+assert.compareArray("x".split(/.*/), ["", ""], '"x".split(/.*/) must return ["", ""]');
+assert.compareArray("x".split(/.+/), ["", ""], '"x".split(/.+/) must return ["", ""]');
+assert.compareArray("x".split(/.*?/), ["x"], '"x".split(/.*?/) must return ["x"]');
+assert.compareArray("x".split(/.{1}/), ["", ""], '"x".split(/.{1}/) must return ["", ""]');
+assert.compareArray("x".split(/.{1,}/), ["", ""], '"x".split(/.{1,}/) must return ["", ""]');
+assert.compareArray("x".split(/.{1,2}/), ["", ""], '"x".split(/.{1,2}/) must return ["", ""]');
+assert.compareArray("x".split(/()/), ["x"], '"x".split(/()/) must return ["x"]');
+assert.compareArray("x".split(/./), ["",""], '"x".split(/./) must return ["",""]');
+assert.compareArray("x".split(/(?:)/), ["x"], '"x".split(/(?:)/) must return ["x"]');
+assert.compareArray("x".split(/(...)/), ["x"], '"x".split(/(...)/) must return ["x"]');
+assert.compareArray("x".split(/(|)/), ["x"], '"x".split(/(|)/) must return ["x"]');
+assert.compareArray("x".split(/[]/), ["x"], '"x".split(/[]/) must return ["x"]');
+assert.compareArray("x".split(/[^]/), ["", ""], '"x".split(/[^]/) must return ["", ""]');
+assert.compareArray("x".split(/[.-.]/), ["x"], '"x".split(/[.-.]/) must return ["x"]');
+assert.compareArray("x".split(/\0/), ["x"], '"x".split(/\\0/) must return ["x"]');
+assert.compareArray("x".split(/\b/), ["x"], '"x".split(/\\b/) must return ["x"]');
+assert.compareArray("x".split(/\B/), ["x"], '"x".split(/\\B/) must return ["x"]');
+assert.compareArray("x".split(/\d/), ["x"], '"x".split(/\\d/) must return ["x"]');
+assert.compareArray("x".split(/\D/), ["", ""], '"x".split(/\\D/) must return ["", ""]');
+assert.compareArray("x".split(/\n/), ["x"], '"x".split(/\\n/) must return ["x"]');
+assert.compareArray("x".split(/\r/), ["x"], '"x".split(/\\r/) must return ["x"]');
+assert.compareArray("x".split(/\s/), ["x"], '"x".split(/\\s/) must return ["x"]');
+assert.compareArray("x".split(/\S/), ["", ""], '"x".split(/\\S/) must return ["", ""]');
+assert.compareArray("x".split(/\v/), ["x"], '"x".split(/\\v/) must return ["x"]');
+assert.compareArray("x".split(/\w/), ["", ""], '"x".split(/\\w/) must return ["", ""]');
+assert.compareArray("x".split(/\W/), ["x"], '"x".split(/\\W/) must return ["x"]');
+assert.compareArray("x".split(/\k<x>/), ["x"], '"x".split(/\\k<x>/) must return ["x"]');
+assert.compareArray("x".split(/\xA0/), ["x"], '"x".split(/\\xA0/) must return ["x"]');
+assert.compareArray("x".split(/\XA0/), ["x"], '"x".split(/\\XA0/) must return ["x"]');
+assert.compareArray("x".split(/\ddd/), ["x"], '"x".split(/\\ddd/) must return ["x"]');
+assert.compareArray("x".split(/\cY/), ["x"], '"x".split(/\\cY/) must return ["x"]');
+assert.compareArray("x".split(/[\b]/), ["x"], '"x".split(/[\\b]/) must return ["x"]');
+assert.compareArray("x".split(/\x/), ["", ""], '"x".split(/\\x/) must return ["", ""]');
+assert.compareArray("x".split(/\X/), ["x"], '"x".split(/\\X/) must return ["x"]');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-string-instance-is-empty-string-object.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-string-instance-is-empty-string-object.js
new file mode 100644
index 0000000000..bd144fa25b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-string-instance-is-empty-string-object.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split (separator, limit) returns an Array object into which substrings of the result of converting this object to a string have
+    been stored. The substrings are determined by searching from left to right for occurrences of
+    separator; these occurrences are not part of any substring in the returned array, but serve to divide up
+    the string value. The value of separator may be a string of any length or it may be a RegExp object
+es5id: 15.5.4.14_A2_T15
+description: Separator string, instance is empty String object
+---*/
+
+var __string = new String();
+
+var __split = __string.split("");
+
+assert.sameValue(
+  __split.constructor,
+  Array,
+  'The value of __split.constructor is expected to equal the value of Array'
+);
+
+assert.sameValue(__split.length, 0, 'The value of __split.length is 0');
+assert.sameValue(__split[0], undefined, 'The value of __split[0] is expected to equal `undefined`');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-tostring-error.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-tostring-error.js
new file mode 100644
index 0000000000..2224f2b538
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-tostring-error.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2020 Richard Gibson. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: Abrupt completion from ToString on the separator
+info: |
+  1. Let _R_ be ? ToString(_separator_).
+  1. If _lim_ = 0, return _A_.
+---*/
+
+function ExpectedError(message) {
+  this.message = message || "";
+}
+ExpectedError.prototype.toString = function () {
+  return "ExpectedError: " + this.message;
+};
+
+var nonStringableSeparator = {};
+nonStringableSeparator.toString = function() { throw new ExpectedError(); };
+
+assert.throws(ExpectedError, function() {
+  "foo".split(nonStringableSeparator, 0);
+}, 'ToString should be called on the separator before checking if the limit is zero.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-undef-limit-custom.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-undef-limit-custom.js
new file mode 100644
index 0000000000..f711c7f123
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-undef-limit-custom.js
@@ -0,0 +1,69 @@
+// Copyright (C) 2020 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: Separator is undefined, limit is a positive number, return a new array with the string 
+info: |
+  ...
+  3. Let S be ? ToString(O).
+  4. Let A be ! ArrayCreate(0).
+  ...
+  6. If limit is undefined, let lim be 232 - 1; else let lim be ? ToUint32(limit).
+  7. Let R be ? ToString(separator).
+  8. If lim = 0, return A.
+  9. If separator is undefined, then
+    a. Perform ! CreateDataPropertyOrThrow(A, "0", S).
+    b. Return A.
+---*/
+
+var str = 'undefined is not a function';
+
+var result = str.split(undefined, 1);
+
+assert.sameValue(Array.isArray(result), true, '1, result is array');
+assert.sameValue(result.length, 1, '1, result.length');
+assert.sameValue(result[0], str, '1, [0] is the same string');
+
+result = str.split(undefined, 2);
+
+assert.sameValue(Array.isArray(result), true, '2, result is array');
+assert.sameValue(result.length, 1, '2, result.length');
+assert.sameValue(result[0], str, '2, [0] is the same string');
+
+result = str.split(undefined, undefined);
+
+assert.sameValue(Array.isArray(result), true, 'undefined, result is array');
+assert.sameValue(result.length, 1, 'undefined, result.length');
+assert.sameValue(result[0], str, 'undefined, [0] is the same string');
+
+result = str.split(undefined, true);
+
+assert.sameValue(Array.isArray(result), true, 'boolean, result is array');
+assert.sameValue(result.length, 1, 'boolean, result.length');
+assert.sameValue(result[0], str, 'boolean, [0] is the same string');
+
+result = str.split(undefined, 2 ** 32 + 1);
+
+assert.sameValue(Array.isArray(result), true, 'ToUint32 2 ** 32 + 1, result is array');
+assert.sameValue(result.length, 1, 'ToUint32 2 ** 32 + 1, result.length');
+assert.sameValue(result[0], str, 'ToUint32 2 ** 32 + 1, [0] is the same string');
+
+result = str.split(undefined, 2 ** 31);
+
+assert.sameValue(Array.isArray(result), true, 'ToUint32 2 ** 31, result is array');
+assert.sameValue(result.length, 1, 'ToUint32 2 ** 31, result.length');
+assert.sameValue(result[0], str, 'ToUint32 2 ** 31, [0] is the same string');
+
+result = str.split(undefined, 2 ** 16);
+
+assert.sameValue(Array.isArray(result), true, 'ToUint32 2 ** 16, result is array');
+assert.sameValue(result.length, 1, 'ToUint32 2 ** 16, result.length');
+assert.sameValue(result[0], str, 'ToUint32 2 ** 16, [0] is the same string');
+
+result = str.split(undefined, {valueOf() { return 1; }});
+
+assert.sameValue(Array.isArray(result), true, 'boolean, result is array');
+assert.sameValue(result.length, 1, 'boolean, result.length');
+assert.sameValue(result[0], str, 'boolean, [0] is the same string');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-undef-limit-zero.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-undef-limit-zero.js
new file mode 100644
index 0000000000..972816493d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-undef-limit-zero.js
@@ -0,0 +1,66 @@
+// Copyright (C) 2020 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: Separator is undefined, limit is zero, return a new empty array
+info: |
+  ...
+  3. Let S be ? ToString(O).
+  4. Let A be ! ArrayCreate(0).
+  ...
+  6. If limit is undefined, let lim be 2**32 - 1; else let lim be ? ToUint32(limit).
+  7. Let R be ? ToString(separator).
+  8. If lim = 0, return A.
+
+  ToUint32 ( argument )
+
+  1. Let number be ? ToNumber(argument).
+  2. If number is NaN, +0, -0, +∞, or -∞, return +0.
+  3. Let int be the Number value that is the same sign as number and whose magnitude is floor(abs(number)).
+  4. Let int32bit be int modulo 2**32.
+  5. Return int32bit.
+---*/
+
+var str = 'undefined is not a function';
+
+var result = str.split(undefined, 0);
+
+assert.sameValue(Array.isArray(result), true, 'result is array');
+assert.sameValue(result.length, 0, 'result.length');
+
+result = str.split(undefined, false);
+
+assert.sameValue(Array.isArray(result), true, 'boolean, result is array');
+assert.sameValue(result.length, 0, 'boolean, result.length');
+
+result = str.split(undefined, null);
+
+assert.sameValue(Array.isArray(result), true, 'null, result is array');
+assert.sameValue(result.length, 0, 'null, result.length');
+
+result = str.split(undefined, {valueOf() { return undefined; }});
+
+assert.sameValue(Array.isArray(result), true, 'obj > undefined, result is array');
+assert.sameValue(result.length, 0, 'obj > undefined, result.length');
+
+result = str.split(undefined, {valueOf() { return 0; }});
+
+assert.sameValue(Array.isArray(result), true, 'obj > 0, result is array');
+assert.sameValue(result.length, 0, 'obj > 0, result.length');
+
+result = str.split(undefined, NaN);
+
+assert.sameValue(Array.isArray(result), true, 'NaN, result is array');
+assert.sameValue(result.length, 0, 'NaN, result.length');
+
+result = str.split(undefined, 2 ** 32);
+
+assert.sameValue(Array.isArray(result), true, '2 ** 32, result is array');
+assert.sameValue(result.length, 0, '2 ** 32, result.length');
+
+result = str.split(undefined, 2 ** 33);
+
+assert.sameValue(Array.isArray(result), true, '2 ** 33, result is array');
+assert.sameValue(result.length, 0, '2 ** 33, result.length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/separator-undef.js b/js/src/tests/test262/built-ins/String/prototype/split/separator-undef.js
new file mode 100644
index 0000000000..c0a6454153
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/separator-undef.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2020 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: Separator is undefined, return a new array with the string
+info: |
+  ...
+  3. Let S be ? ToString(O).
+  4. Let A be ! ArrayCreate(0).
+  ...
+  6. If limit is undefined, let lim be 232 - 1; else let lim be ? ToUint32(limit).
+  7. Let R be ? ToString(separator).
+  8. If lim = 0, return A.
+  9. If separator is undefined, then
+    a. Perform ! CreateDataPropertyOrThrow(A, "0", S).
+    b. Return A.
+---*/
+
+var str = 'undefined is not a function';
+
+var result = str.split();
+
+assert.sameValue(Array.isArray(result), true, 'implicit separator, result is array');
+assert.sameValue(result.length, 1, 'implicit separator, result.length');
+assert.sameValue(result[0], str, 'implicit separator, [0] is the same string');
+
+result = str.split(undefined);
+
+assert.sameValue(Array.isArray(result), true, 'explicit separator, result is array');
+assert.sameValue(result.length, 1, 'explicit separator, result.length');
+assert.sameValue(result[0], str, 'explicit separator, [0] is the same string');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/shell.js b/js/src/tests/test262/built-ins/String/prototype/split/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/split/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..4870dfaf8e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var split = String.prototype.split;
+
+assert.sameValue(typeof split, 'function');
+
+assert.throws(TypeError, function() {
+  split.call(undefined, '');
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  split.call(null, '');
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/this-value-tostring-error.js b/js/src/tests/test262/built-ins/String/prototype/split/this-value-tostring-error.js
new file mode 100644
index 0000000000..a03b9ebaf7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/this-value-tostring-error.js
@@ -0,0 +1,48 @@
+// Copyright (C) 2020 Richard Gibson. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.split
+description: Abrupt completion from ToString on the "this" value
+info: |
+  1. Let _O_ be ? RequireObjectCoercible(*this* value).
+  1. If _separator_ is neither *undefined* nor *null*, then
+    1. Let _splitter_ be ? GetMethod(_separator_, @@split).
+    1. If _splitter_ is not *undefined*, then
+      1. Return ? Call(_splitter_, _separator_, &laquo; _O_, _limit_ &raquo;).
+  1. Let _S_ be ? ToString(_O_).
+features: [Symbol, Symbol.split, Symbol.toPrimitive]
+---*/
+
+function ExpectedError(message) {
+  this.message = message || "";
+}
+ExpectedError.prototype.toString = function () {
+  return "ExpectedError: " + this.message;
+};
+
+var split = String.prototype.split;
+
+var nonStringableReceiver = {};
+nonStringableReceiver.toString = function() { throw new ExpectedError("receiver.toString"); };
+
+var splitter = {};
+splitter[Symbol.split] = function() {};
+
+try {
+  split.call(nonStringableReceiver, splitter, Symbol());
+} catch (e) {
+  assert.sameValue(e, undefined,
+      'ToString should not be called on the receiver when the separator has a @@split method.');
+}
+
+var nonStringableSeparator = {};
+nonStringableSeparator[Symbol.toPrimitive] =
+  function() { throw new Test262Error("separator[Symbol.toPrimitive]"); };
+nonStringableSeparator.toString = function() { throw new Test262Error("separator.toString"); };
+nonStringableSeparator.valueOf = function() { throw new Test262Error("separator.valueOf"); };
+
+assert.throws(ExpectedError, function() {
+  split.call(nonStringableReceiver, nonStringableSeparator, Symbol());
+}, 'ToString should be called on the receiver before processing the separator or limit.');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/transferred-to-custom.js b/js/src/tests/test262/built-ins/String/prototype/split/transferred-to-custom.js
new file mode 100644
index 0000000000..fc9ec30167
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/transferred-to-custom.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.split
+description: >
+    split method can be "transferred" to another object
+    whose this value can be coerced to a string.
+info: |
+    String.prototype.split(separator, limit):
+
+    Let O be ? RequireObjectCoercible(this value).
+    ...
+    Let S be ? ToString(O).
+
+includes: [compareArray.js]
+---*/
+
+
+function Splittable(value) {
+  this.toString = function() {
+    return value + "";
+  };
+  this.valueOf = function() {
+    throw new Test262Error();
+  };
+}
+
+Splittable.prototype.split = String.prototype.split;
+
+let splittable = new Splittable(void 0);
+
+assert.compareArray(splittable.split(""), ["u","n","d","e","f","i","n","e","d"]);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/transferred-to-number-separator-override-tostring-returns-regexp.js b/js/src/tests/test262/built-ins/String/prototype/split/transferred-to-number-separator-override-tostring-returns-regexp.js
new file mode 100644
index 0000000000..ae90427c91
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/transferred-to-number-separator-override-tostring-returns-regexp.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.split(separator, limit):
+    i) can be transferred to other kinds of objects for use as a method.
+    separator and limit can be any kinds of object since:
+    ii) if separator is not RegExp ToString(separator) performs and
+    iii) ToInteger(limit) performs
+es5id: 15.5.4.14_A1_T16
+description: >
+    Argument is object, and instance is Number.  Object have overrided
+    toString function, that return regexp
+---*/
+
+var __obj = {
+  toString: function() {
+    return /\u0037\u0037/g;
+  }
+};
+
+Number.prototype.split = String.prototype.split;
+
+try {
+  var __split = (6776767677.006771122677555).split(__obj);
+  Test262Error.thrower('#1: "__split = 6776767677.006771122677555.split(__obj)" lead to throwing exception');
+} catch (e) {
+  assert(e instanceof TypeError, 'The result of `(e instanceof TypeError)` is true');
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/split/valueOf-is-called-for-limit-argument.js b/js/src/tests/test262/built-ins/String/prototype/split/valueOf-is-called-for-limit-argument.js
new file mode 100644
index 0000000000..9e9b71d43e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/split/valueOf-is-called-for-limit-argument.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2020 Rick Waldron.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.split
+description: >
+  Calls valueOf() of limit argument
+info: |
+  String.prototype.split(separator, limit):
+
+  If limit is undefined, let lim be 232 - 1; else let lim be ℝ(? ToUint32(limit)).
+features: [arrow-function]
+---*/
+
+
+let limit = {
+  toString() {},
+  valueOf() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, () => {
+  "".split("", limit);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/browser.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/coerced-values-of-position.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/coerced-values-of-position.js
new file mode 100644
index 0000000000..b12e6d8e0f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/coerced-values-of-position.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns based on coerced values of position.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  9. Let pos be ToInteger(position). (If position is undefined, this step
+  produces the value 0).
+  10. ReturnIfAbrupt(pos).
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. If searchLength+start is greater than len, return false.
+  15. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  16. Otherwise, return false.
+  ...
+---*/
+
+var str = 'The future is cool!';
+
+assert(str.startsWith('The future', NaN), 'NaN coerced to 0');
+assert(str.startsWith('The future', null), 'null coerced to 0');
+assert(str.startsWith('The future', false), 'false coerced to 0');
+assert(str.startsWith('The future', ''), '"" coerced to 0');
+assert(str.startsWith('The future', '0'), '"0" coerced to 0');
+assert(str.startsWith('The future', undefined), 'undefined coerced to 0');
+assert(str.startsWith('The future', 0.4), '0.4 coerced to 0');
+
+assert.sameValue(
+  str.startsWith('The future', true), false,
+  'true coerced to 1'
+);
+assert.sameValue(str.startsWith('The future', '1'), false, '"1" coerced to 1');
+assert.sameValue(str.startsWith('The future', 1.4), false, '1.4 coerced to 1');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/length.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/length.js
new file mode 100644
index 0000000000..3e19e74994
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/length.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  String.prototype.startsWith.length value and descriptor.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  The length property of the startsWith method is 1.
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.startsWith.length, 1,
+  'The value of `String.prototype.startsWith.length` is `1`'
+);
+
+verifyNotEnumerable(String.prototype.startsWith, 'length');
+verifyNotWritable(String.prototype.startsWith, 'length');
+verifyConfigurable(String.prototype.startsWith, 'length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/name.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/name.js
new file mode 100644
index 0000000000..4baa4a3076
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/name.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  String.prototype.startsWith.name value and descriptor.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  String.prototype.startsWith.name, 'startsWith',
+  'The value of `String.prototype.startsWith.name` is `"startsWith"`'
+);
+
+verifyNotEnumerable(String.prototype.startsWith, 'name');
+verifyNotWritable(String.prototype.startsWith, 'name');
+verifyConfigurable(String.prototype.startsWith, 'name');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/not-a-constructor.js
new file mode 100644
index 0000000000..a286537efc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.startsWith does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.startsWith),
+  false,
+  'isConstructor(String.prototype.startsWith) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.startsWith();
+}, '`new String.prototype.startsWith()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/out-of-bounds-position.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/out-of-bounds-position.js
new file mode 100644
index 0000000000..820e85662d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/out-of-bounds-position.js
@@ -0,0 +1,45 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns false if searchLength + start position is greater than string length.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. If searchLength+start is greater than len, return false.
+  ...
+---*/
+
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.startsWith('!', str.length), false,
+  'str.startsWith("!", str.length) returns false'
+);
+
+assert.sameValue(
+  str.startsWith('!', 100), false,
+  'str.startsWith("!", 100) returns false'
+);
+
+assert.sameValue(
+  str.startsWith('!', Infinity), false,
+  'str.startsWith("!", Infinity) returns false'
+);
+
+assert(
+  str.startsWith('The future', -1),
+  'position argument < 0 will search from the start of the string (-1)'
+);
+
+assert(
+  str.startsWith('The future', -Infinity),
+  'position argument < 0 will search from the start of the string (-Infinity)'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-position-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-position-as-symbol.js
new file mode 100644
index 0000000000..668ab343aa
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-position-as-symbol.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns abrupt from ToInteger(position) as a Symbol.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  9. Let pos be ToInteger(position). (If position is undefined, this step
+  produces the value 0).
+  10. ReturnIfAbrupt(pos).
+  ...
+features: [Symbol]
+---*/
+
+var position = Symbol();
+
+assert.throws(TypeError, function() {
+  ''.startsWith('', position);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-position.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-position.js
new file mode 100644
index 0000000000..2a8e9b9917
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-position.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns abrupt from ToInteger(position).
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  9. Let pos be ToInteger(position). (If position is undefined, this step
+  produces the value 0).
+  10. ReturnIfAbrupt(pos).
+  ...
+---*/
+
+var position = {
+  valueOf: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.startsWith('', position);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring-as-symbol.js
new file mode 100644
index 0000000000..d4a53cff06
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring-as-symbol.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns abrupt from ToString(searchString) as a Symbol
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  7. Let searchStr be ToString(searchString).
+  8. ReturnIfAbrupt(searchString).
+  ...
+features: [Symbol]
+---*/
+
+var s = Symbol();
+
+assert.throws(TypeError, function() {
+  ''.startsWith(s);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring-regexp-test.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring-regexp-test.js
new file mode 100644
index 0000000000..5fd775ad0b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring-regexp-test.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns abrupt from IsRegExp(searchString).
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  4. Let isRegExp be IsRegExp(searchString).
+  5. ReturnIfAbrupt(isRegExp).
+  ...
+
+  7.2.8 IsRegExp ( argument )
+
+  2. Let isRegExp be Get(argument, @@match).
+  3. ReturnIfAbrupt(isRegExp).
+features: [Symbol.match]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, Symbol.match, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.startsWith(obj);
+});
+
+var regexp = /./;
+Object.defineProperty(regexp, Symbol.match, {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+assert.throws(Test262Error, function() {
+  ''.startsWith(regexp);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring.js
new file mode 100644
index 0000000000..26a9376388
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-searchstring.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns abrupt from ToString(searchString)
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  7. Let searchStr be ToString(searchString).
+  8. ReturnIfAbrupt(searchString).
+  ...
+---*/
+
+var obj = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  ''.startsWith(obj);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-this-as-symbol.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-this-as-symbol.js
new file mode 100644
index 0000000000..2e66a64380
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-this-as-symbol.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns abrupt from ToString(this) where this is a Symbol
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+features: [Symbol]
+---*/
+
+var s = Symbol('');
+
+assert.throws(TypeError, function() {
+  String.prototype.startsWith.call(s, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-this.js
new file mode 100644
index 0000000000..727cd25b93
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-abrupt-from-this.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns abrupt from ToString(this)
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+  3. ReturnIfAbrupt(S).
+---*/
+
+var o = {
+  toString: function() {
+    throw new Test262Error();
+  }
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.startsWith.call(o, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/return-true-if-searchstring-is-empty.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-true-if-searchstring-is-empty.js
new file mode 100644
index 0000000000..a65c494055
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/return-true-if-searchstring-is-empty.js
@@ -0,0 +1,42 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns true if searchString.length == 0.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. If searchLength+start is greater than len, return false.
+  15. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  ...
+---*/
+
+var str = 'The future is cool!';
+
+assert(
+  str.startsWith(''),
+  'str.startsWith("") returns true'
+);
+
+assert(
+  str.startsWith('', str.length),
+  'str.startsWith("", str.length) returns true'
+);
+
+assert(
+  str.startsWith(''),
+  'str.startsWith("") returns true'
+);
+
+assert(
+  str.startsWith('', Infinity),
+  'str.startsWith("", Infinity) returns true'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-found-with-position.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-found-with-position.js
new file mode 100644
index 0000000000..bae9a17f2e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-found-with-position.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns true if searchString appears as a substring of the given string with a
+  given position.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. If searchLength+start is greater than len, return false.
+  15. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  ...
+---*/
+
+var str = 'The future is cool!';
+
+assert(
+  str.startsWith('The future', 0),
+  'str.startsWith("The future", 0) === true'
+);
+assert(
+  str.startsWith('future', 4),
+  'str.startsWith("future", 4) === true'
+);
+assert(
+  str.startsWith(' is cool!', 10),
+  'str.startsWith(" is cool!", 10) === true'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-found-without-position.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-found-without-position.js
new file mode 100644
index 0000000000..252a877cae
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-found-without-position.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns true if searchString appears as a substring of the given string.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. If searchLength+start is greater than len, return false.
+  15. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  ...
+---*/
+
+var str = 'The future is cool!';
+
+assert(str.startsWith('The '), 'str.startsWith("The ") === true');
+assert(str.startsWith('The future'), 'str.startsWith("The future") === true');
+assert(str.startsWith(str), 'str.startsWith(str) === true');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-is-regexp-throws.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-is-regexp-throws.js
new file mode 100644
index 0000000000..e07883e18b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-is-regexp-throws.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Throws a TypeError if searchString is a RegExp.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  4. Let isRegExp be IsRegExp(searchString).
+  5. ReturnIfAbrupt(isRegExp).
+  6. If isRegExp is true, throw a TypeError exception.
+  ...
+---*/
+
+var searchString = /./;
+
+assert.throws(TypeError, function() {
+  ''.startsWith(searchString);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-not-found-with-position.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-not-found-with-position.js
new file mode 100644
index 0000000000..103223214b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-not-found-with-position.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns false if searchString is not found with a given position.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. If searchLength+start is greater than len, return false.
+  15. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  16. Otherwise, return false.
+  ...
+---*/
+
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.startsWith('The future', 1), false,
+  'str.startsWith("The future", 1) === false'
+);
+
+assert.sameValue(
+  str.startsWith(str, 1), false,
+  'str.startsWith(str, 1) === false'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-not-found-without-position.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-not-found-without-position.js
new file mode 100644
index 0000000000..04afa3c929
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/searchstring-not-found-without-position.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Returns false if searchString is not found.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  ...
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLength be the number of elements in searchStr.
+  14. If searchLength+start is greater than len, return false.
+  15. If the sequence of elements of S starting at start of length searchLength
+  is the same as the full element sequence of searchStr, return true.
+  16. Otherwise, return false.
+  ...
+---*/
+
+var str = 'The future is cool!';
+
+assert.sameValue(
+  str.startsWith('Flash'), false,
+  'str.startsWith("Flash") === false'
+);
+assert.sameValue(
+  str.startsWith('THE FUTURE'), false,
+  'startsWith is case sensitive'
+);
+assert.sameValue(
+  str.startsWith('future is cool!'), false,
+  'str.startsWith("future is cool!") === false'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/shell.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/startsWith.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/startsWith.js
new file mode 100644
index 0000000000..a0f0397a0c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/startsWith.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Property type and descriptor.
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.startsWith,
+  'function',
+  '`typeof String.prototype.startsWith` is `function`'
+);
+
+verifyNotEnumerable(String.prototype, 'startsWith');
+verifyWritable(String.prototype, 'startsWith');
+verifyConfigurable(String.prototype, 'startsWith');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/this-is-null-throws.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/this-is-null-throws.js
new file mode 100644
index 0000000000..962a68f925
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/this-is-null-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Throws TypeError when `this` is null
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.startsWith.call(null, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/startsWith/this-is-undefined-throws.js b/js/src/tests/test262/built-ins/String/prototype/startsWith/this-is-undefined-throws.js
new file mode 100644
index 0000000000..6b0803a2f6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/startsWith/this-is-undefined-throws.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.18
+description: >
+  Throws TypeError when `this` is undefined
+info: |
+  21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
+
+  1. Let O be RequireObjectCoercible(this value).
+  2. Let S be ToString(O).
+---*/
+
+assert.throws(TypeError, function() {
+  String.prototype.startsWith.call(undefined, '');
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A10.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A10.js
new file mode 100644
index 0000000000..975f744408
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A10.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.substring.length property has the attribute ReadOnly
+es5id: 15.5.4.15_A10
+description: >
+    Checking if varying the String.prototype.substring.length property
+    fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.substring.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.substring.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.substring.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.substring.length;
+
+verifyNotWritable(String.prototype.substring, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.substring.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.substring.length; String.prototype.substring.length = function(){return "shifted";}; String.prototype.substring.length === __obj. Actual: ' + String.prototype.substring.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A11.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A11.js
new file mode 100644
index 0000000000..e47ca07b9b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the substring method is 2
+es5id: 15.5.4.15_A11
+description: Checking String.prototype.substring.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.substring.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.substring.hasOwnProperty("length") return true. Actual: ' + String.prototype.substring.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.substring.length !== 2) {
+  throw new Test262Error('#2: String.prototype.substring.length === 2. Actual: ' + String.prototype.substring.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T1.js
new file mode 100644
index 0000000000..ff536ea56c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T1
+description: Arguments are false and true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(false, true) !== "t") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.substring = String.prototype.substring;  __instance.substring(false, true) === "t". Actual: ' + __instance.substring(false, true));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T10.js
new file mode 100644
index 0000000000..0f25e1444a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T10.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T10
+description: >
+    Arguments are object and function call, and instance is String,
+    object have overrided valueOf function
+---*/
+
+var __obj = {
+  valueOf: function() {
+    return 2;
+  }
+};
+
+var __str = "\u0035ABBBABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__str.substring(__obj, function() {
+    return __str.substring(0, 1);
+  }()) !== "BBB") {
+  throw new Test262Error('#1: var __obj = {valueOf:function(){return 2;}}; var __str = "\u0035ABBBABAB"; __str.substring(__obj, function(){return __str.substring(0,1);}()) === "BBB". Actual: ' + __str.substring(__obj, function() {
+    return __str.substring(0, 1);
+  }()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T11.js
new file mode 100644
index 0000000000..8a26c02d22
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T11.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T11
+description: >
+    Arguments are objects, and instance is string, objects have
+    overrided valueOf function, that return exception
+---*/
+
+var __obj = {
+  valueOf: function() {
+    throw "instart";
+  }
+};
+var __obj2 = {
+  valueOf: function() {
+    throw "inend";
+  }
+};
+var __str = "ABB\u0041BABAB";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.substring(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.substring(__obj,__obj2)" lead to throw exception');
+} catch (e) {
+  if (e !== "instart") {
+    throw new Test262Error('#1.1: Exception === "instart". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T12.js
new file mode 100644
index 0000000000..f201db16aa
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T12.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T12
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided valueOf function and toString function, that return
+    exception.  Second object have overrided valueOf function, that
+    return exception
+---*/
+
+var __obj = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    throw "instart";
+  }
+};
+var __obj2 = {
+  valueOf: function() {
+    throw "inend";
+  }
+};
+var __str = new String("ABB\u0041BABAB");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __str.substring(__obj, __obj2);
+  throw new Test262Error('#1: "var x = __str.substring(__obj,__obj2)" lead to throw exception');
+} catch (e) {
+  if (e !== "instart") {
+    throw new Test262Error('#1.1: Exception ==="instart". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T13.js
new file mode 100644
index 0000000000..2f4c8c017b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T13.js
@@ -0,0 +1,40 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T13
+description: >
+    Arguments are objects, and instance is string.  First object have
+    overrided valueOf and toString functions.  Second object have
+    overrided toString function, that return exception
+---*/
+
+var __obj = {
+  valueOf: function() {
+    return {};
+  },
+  toString: function() {
+    return 1;
+  }
+};
+var __obj2 = {
+  toString: function() {
+    throw "inend";
+  }
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = "ABB\u0041BABAB\u0031BBAA".substring(__obj, __obj2);
+  throw new Test262Error('#1: var x = "ABB\\u0041BABAB\\u0031BBAA".substring(__obj,__obj2) lead to throw exception');
+} catch (e) {
+  if (e !== "inend") {
+    throw new Test262Error('#1.1: Exception === "inend". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T14.js
new file mode 100644
index 0000000000..1df3613662
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T14.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T14
+description: Used one argument, that is function(){}(). Instance is string
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("report".substring(function() {}()) !== "report") {
+  throw new Test262Error('#1: "report".substring(function(){}()) === "report". Actual: ' + "report".substring(function() {}()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T15.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T15.js
new file mode 100644
index 0000000000..9055b4be17
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T15.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T15
+description: >
+    Call substring without arguments. Instance is Number with
+    prototype.substring = String.prototype.substring
+---*/
+
+var __num = 11.001002;
+
+Number.prototype.substring = String.prototype.substring;
+
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__num.substring() !== "11.001002") {
+  throw new Test262Error('#1: var __num = 11.001002; Number.prototype.substring = String.prototype.substring; __num.substring()==="11.001002". Actual: ' + __num.substring());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T2.js
new file mode 100644
index 0000000000..8d9aaba34b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T2.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T2
+description: >
+    Arguments are function call and x, and instance is Boolean. x is
+    undefined variable
+---*/
+
+var __instance = new Boolean;
+
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(function() {
+    return true;
+  }(), x) !== "alse") {
+  throw new Test262Error('#1: var x; __instance = new Boolean; __instance.substring = String.prototype.substring;  __instance.substring(function(){return true;}(),x) === "alse". Actual: ' + __instance.substring(function() {
+    return true;
+  }(), x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T4.js
new file mode 100644
index 0000000000..fbc683ea59
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T4.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T4
+description: >
+    Arguments are null and number, and instance is function call, that
+    returned string
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (function() {
+    return "gnulluna"
+  }().substring(null, -3) !== "") {
+  throw new Test262Error('#1: function(){return "gnulluna"}().substring(null, -3) === "". Actual: ' + function() {
+    return "gnulluna"
+  }().substring(null, -3));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T5.js
new file mode 100644
index 0000000000..38486f9119
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T5.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T5
+description: >
+    Arguments are null and Function(), and instance is function
+    object, that have overrided valueOf function
+---*/
+
+__func.valueOf = function() {
+  return "gnulluna"
+};
+
+Function.prototype.substring = String.prototype.substring;
+
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__func.substring(null, Function()) !== "") {
+  throw new Test262Error('#1: __func.valueOf=function(){return "gnulluna"}; Function.prototype.substring=String.prototype.substring; function __func(){}; __func.substring(null, Function()) === "". Actual: ' + __func.substring(null, Function()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __func() {};
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T6.js
new file mode 100644
index 0000000000..b776857af7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T6.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T6
+description: >
+    Arguments are x and number, and instance is new String, x is
+    undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (new String("undefined").substring(x, 3) !== "und") {
+  throw new Test262Error('#1: var x; new String("undefined").substring(x,3) === "und". Actual: ' + new String("undefined").substring(x, 3));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T7.js
new file mode 100644
index 0000000000..f65314fcf0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T7.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T7
+description: Arguments are symbol and undefined, and instance is String
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String(void 0).substring("e", undefined) !== "undefined") {
+  throw new Test262Error('#1: String(void 0).substring("e",undefined) === "undefined". Actual: ' + String(void 0).substring("e", undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T8.js
new file mode 100644
index 0000000000..9e7462fb26
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T8.js
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T8
+description: >
+    Arguments are negative number and void 0, and instance is
+    String(object), object have overrided toString function
+---*/
+
+var __obj = {
+  toString: function() {}
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String(__obj).substring(-4, void 0) !== "undefined") {
+  throw new Test262Error('#1: __obj = {toString:function(){}}; String(__obj).substring(-4,void 0) === "undefined". Actual: ' + String(__obj).substring(-4, void 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T9.js
new file mode 100644
index 0000000000..a95c31d8cd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A1_T9.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end)
+es5id: 15.5.4.15_A1_T9
+description: >
+    Arguments are undefined and object, and instance is new
+    String(object), object have overrided valueOf and toString
+    functions
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (new String(__obj).substring( /*(function(){})()*/ undefined, undefined) !== "undefined") {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; new String(__obj).substring(/*(function(){})()*/undefined,undefined) === "undefined". Actual: ' + new String(__obj).substring( /*(function(){})()*/ undefined, undefined));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T1.js
new file mode 100644
index 0000000000..f8d5f6ca18
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T1.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T1
+description: Checking type of substring()
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (typeof __string.substring() !== "string") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); typeof __string.substring() === "string". Actual: ' + typeof __string.substring());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T10.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T10.js
new file mode 100644
index 0000000000..7bd4973cda
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T10.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T10
+description: start is 0, end is 8
+---*/
+
+var __string = new String("this_is_a_string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(0, 8) !== "this_is_") {
+  throw new Test262Error('#1: __string = new String("this_is_a_string object"); __string.substring(0,8) === "this_is_". Actual: ' + __string.substring(0, 8));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T2.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T2.js
new file mode 100644
index 0000000000..58866341a9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T2.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T2
+description: start is NaN, end is Infinity
+---*/
+
+var __string = new String('this is a string object');
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(NaN, Infinity) !== "this is a string object") {
+  throw new Test262Error('#1: __string = new String(\'this is a string object\'); __string.substring(NaN, Infinity) === "this is a string object". Actual: ' + __string.substring(NaN, Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T3.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T3.js
new file mode 100644
index 0000000000..ba88236409
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T3.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T3
+description: Call substring from empty String object
+---*/
+
+var __string = new String("");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(1, 0) !== "") {
+  throw new Test262Error('#1: __string = new String(""); __string.substring(1,0) === "". Actual: ' + __string.substring(1, 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T4.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T4.js
new file mode 100644
index 0000000000..02f8ffe3da
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T4.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T4
+description: start is Infinity, end is NaN
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(Infinity, NaN) !== "this is a string object") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.substring(Infinity, NaN) === "this is a string object". Actual: ' + __string.substring(Infinity, NaN));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T5.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T5.js
new file mode 100644
index 0000000000..49d234a938
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T5.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T5
+description: start is Infinity, end is Infinity
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(Infinity, Infinity) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.substring(Infinity, Infinity) === "". Actual: ' + __string.substring(Infinity, Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T6.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T6.js
new file mode 100644
index 0000000000..2c685d97bc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T6.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T6
+description: start is negative float number, end is 0
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(-0.01, 0) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.substring(-0.01,0) === "". Actual: ' + __string.substring(-0.01, 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T7.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T7.js
new file mode 100644
index 0000000000..cb82b6b5bd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T7
+description: start is tested_string.length, end is tested_string.length
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(__string.length, __string.length) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.substring(__string.length, __string.length) === "". Actual: ' + __string.substring(__string.length, __string.length));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T8.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T8.js
new file mode 100644
index 0000000000..9764869573
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T8.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T8
+description: start is tested_string.length+1, end is 0
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(__string.length + 1, 0) !== "this is a string object") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.substring(__string.length+1, 0) === "this is a string object". Actual: ' + __string.substring(__string.length + 1, 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T9.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T9.js
new file mode 100644
index 0000000000..a485ba798b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A2_T9.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring (start, end) returns a string value(not object)
+es5id: 15.5.4.15_A2_T9
+description: start is -Infinity, end is -Infinity
+---*/
+
+var __string = new String("this is a string object");
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__string.substring(-Infinity, -Infinity) !== "") {
+  throw new Test262Error('#1: __string = new String("this is a string object"); __string.substring(-Infinity, -Infinity) === "". Actual: ' + __string.substring(-Infinity, -Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T1.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T1.js
new file mode 100644
index 0000000000..386e80c7ae
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T1.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T1
+description: >
+    Apply String.prototype.substring to Array instance. Start is
+    Infinity, end is -Infinity
+---*/
+
+var __instance = new Array(1, 2, 3, 4, 5);
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(Infinity, -Infinity) !== "1,2,3,4,5") {
+  throw new Test262Error('#1: __instance = new Array(1,2,3,4,5); __instance.substring = String.prototype.substring; __instance.substring(Infinity,-Infinity) === "1,2,3,4,5". Actual: ' + __instance.substring(Infinity, -Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T10.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T10.js
new file mode 100644
index 0000000000..6e2f22bd65
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T10.js
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T10
+description: >
+    Checknig if applying String.prototype.substring to Function object
+    instance passes
+---*/
+
+__FACTORY.prototype.substring = String.prototype.substring;
+
+var __instance = new __FACTORY(void 0);
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(0, 100) !== "undefined") {
+  throw new Test262Error('#1: __instance.substring(0, 100) === "undefined". Actual: ' + __instance.substring(0, 100));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+function __FACTORY(value) {
+  this.value = value;
+  this.toString = function() {
+    return this.value + '';
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T11.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T11.js
new file mode 100644
index 0000000000..75a5470692
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T11
+description: >
+    Apply String.prototype.substring to Boolean instance. Start is new
+    Array(), end is new Boolean(1)
+---*/
+
+var __instance = new Boolean();
+
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(new Array(), new Boolean(1)) !== "f") {
+  throw new Test262Error('#1: __instance = new Boolean(); __instance.substring = String.prototype.substring;  __instance.substring(new Array(), new Boolean(1)) === "f". Actual: ' + __instance.substring(new Array(), new Boolean(1)));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T2.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T2.js
new file mode 100644
index 0000000000..06dca8eb98
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T2.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T2
+description: >
+    Apply String.prototype.substring to Array instance. Start is 9,
+    end is -Infinity
+---*/
+
+var __instance = new Array(1, 2, 3, 4, 5);
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(9, -Infinity) !== "1,2,3,4,5") {
+  throw new Test262Error('#1: __instance = new Array(1,2,3,4,5); __instance.substring = String.prototype.substring; __instance.substring(9,-Infinity) === "1,2,3,4,5". Actual: ' + __instance.substring(9, -Infinity));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T3.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T3.js
new file mode 100644
index 0000000000..02eefd05f4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T3.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T3
+description: >
+    Apply String.prototype.substring to Array instance. Start is true,
+    end is false
+---*/
+
+var __instance = new Array(1, 2, 3, 4, 5);
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(true, false) !== "1") {
+  throw new Test262Error('#1: __instance = new Array(1,2,3,4,5); __instance.substring = String.prototype.substring; __instance.substring(true, false) === "1". Actual: ' + __instance.substring(true, false));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T4.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T4.js
new file mode 100644
index 0000000000..8e0e93c8a8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T4.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T4
+description: >
+    Apply String.prototype.substring to Array instance. Start is '4',
+    end is '5'
+---*/
+
+var __instance = new Array(1, 2, 3, 4, 5);
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring('4', '5') !== "3") {
+  throw new Test262Error('#1: __instance = new Array(1,2,3,4,5); __instance.substring = String.prototype.substring; __instance.substring(\'4\', \'5\') === "3". Actual: ' + __instance.substring('4', '5'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T5.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T5.js
new file mode 100644
index 0000000000..2f84981f98
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T5.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T5
+description: >
+    Apply String.prototype.substring to Object instance. Start is 8,
+    end is 0
+---*/
+
+var __instance = new Object();
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(8, 0) !== "[object ") {
+  throw new Test262Error('#1: __instance = new Object(); __instance.substring = String.prototype.substring; __instance.substring(8,0) === "[object ". Actual: ' + __instance.substring(8, 0));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T6.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T6.js
new file mode 100644
index 0000000000..8da063c0d0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T6.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T6
+description: >
+    Apply String.prototype.substring to Object instance. Start is 8,
+    end is length of object.toString
+---*/
+
+var __instance = new Object();
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(8, __instance.toString().length) !== "Object]") {
+  throw new Test262Error('#1: __instance = new Object(); __instance.substring = String.prototype.substring; __instance.substring(8, __instance.toString().length) === "Object]". Actual: ' + __instance.substring(8, __instance.toString().length));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T7.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T7.js
new file mode 100644
index 0000000000..bb2d01fb15
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T7.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T7
+description: >
+    Apply String.prototype.substring to Object instance. Call
+    instance.substring(...).substring(...)
+---*/
+
+var __instance = {
+  toString: function() {
+    return "function(){}";
+  }
+};
+
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(-Infinity, 8) !== "function") {
+  throw new Test262Error('#1: __instance = function(){}; __instance.substring = String.prototype.substring;  __instance.substring(-Infinity,8) === "function". Actual: ' + __instance.substring(8, Infinity).substring(-Infinity, 1));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T8.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T8.js
new file mode 100644
index 0000000000..cda929c34d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T8.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T8
+description: >
+    Apply String.prototype.substring to Number instance. Start is
+    Infinity, end is NaN
+---*/
+
+var __instance = new Number(NaN);
+
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(Infinity, NaN) !== "NaN") {
+  throw new Test262Error('#1: __instance = new Number(NaN); __instance.substring = String.prototype.substring;  __instance.substring(Infinity, NaN) === "NaN". Actual: ' + __instance.substring(Infinity, NaN));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T9.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T9.js
new file mode 100644
index 0000000000..885958b1db
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A3_T9.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.substring (start, end) can be applied to non String object instance and
+    returns a string value(not object)
+es5id: 15.5.4.15_A3_T9
+description: >
+    Apply String.prototype.substring to Math instance. Start is
+    Math.PI, end is -10
+---*/
+
+var __instance = Math;
+
+__instance.substring = String.prototype.substring;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.substring(Math.PI, -10) !== "[ob") {
+  throw new Test262Error('#1: __instance = Math; __instance.substring = String.prototype.substring;  __instance.substring(Math.PI, -10) === "[ob". Actual: ' + __instance.substring(Math.PI, -10));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A6.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A6.js
new file mode 100644
index 0000000000..41d75122b4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring has not prototype property
+es5id: 15.5.4.15_A6
+description: Checking String.prototype.substring.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.substring.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.substring.prototype === undefined. Actual: ' + String.prototype.substring.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A7.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A7.js
new file mode 100644
index 0000000000..1f850f3a0a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.substring can't be used as constructor
+es5id: 15.5.4.15_A7
+description: Checking if creating the String.prototype.substring object fails
+---*/
+
+var __FACTORY = String.prototype.substring;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.substring; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.2: undefined = 1 throw a TypeError. Actual: ' + (e));
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A8.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A8.js
new file mode 100644
index 0000000000..af1656d8ed
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A8.js
@@ -0,0 +1,43 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The String.prototype.substring.length property has the attribute DontEnum
+es5id: 15.5.4.15_A8
+description: >
+    Checking if enumerating the String.prototype.substring.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.substring.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.substring.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.substring.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.substring.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.substring.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.substring) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.substring){if (p==="length") count++;} count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A9.js b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A9.js
new file mode 100644
index 0000000000..4e5a3df24b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/S15.5.4.15_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.substring.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.15_A9
+description: >
+    Checking if deleting the String.prototype.substring.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.substring.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.substring.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.substring.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.substring.length) {
+  throw new Test262Error('#1: delete String.prototype.substring.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.substring.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.substring.length; String.prototype.substring.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.substring.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/browser.js b/js/src/tests/test262/built-ins/String/prototype/substring/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/name.js b/js/src/tests/test262/built-ins/String/prototype/substring/name.js
new file mode 100644
index 0000000000..bbfb54a254
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.19
+description: >
+  String.prototype.substring.name is "substring".
+info: |
+  String.prototype.substring ( start, end )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.substring.name, "substring");
+
+verifyNotEnumerable(String.prototype.substring, "name");
+verifyNotWritable(String.prototype.substring, "name");
+verifyConfigurable(String.prototype.substring, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/substring/not-a-constructor.js
new file mode 100644
index 0000000000..981b8cd665
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.substring does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.substring),
+  false,
+  'isConstructor(String.prototype.substring) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.substring();
+}, '`new String.prototype.substring()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/shell.js b/js/src/tests/test262/built-ins/String/prototype/substring/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/substring/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/substring/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..8f59e5810f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/substring/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.substring
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var substring = String.prototype.substring;
+
+assert.sameValue(typeof substring, 'function');
+
+assert.throws(TypeError, function() {
+  substring.call(undefined, 0, 1);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  substring.call(null, 0, 1);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/Final_Sigma_U180E.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/Final_Sigma_U180E.js
new file mode 100644
index 0000000000..a4a033efb7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/Final_Sigma_U180E.js
@@ -0,0 +1,62 @@
+// Copyright (C) 2016 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tolocalelowercase
+description: >
+    Check if String.prototype.toLocaleLowerCase supports conditional mappings defined in SpecialCasings,
+    test Final_Sigma context with Mongolian Vowel Separator
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+features: [u180e]
+---*/
+
+// SpecialCasing.txt, conditional, language-insensitive mappings.
+
+// <code>; <lower>; <title>; <upper>; (<condition_list>;)? # <comment>
+// 03A3; 03C2; 03A3; 03A3; Final_Sigma; # GREEK CAPITAL LETTER SIGMA
+// 03A3; 03C3; 03A3; 03A3; # GREEK CAPITAL LETTER SIGMA
+
+// Final_Sigma is defined in Unicode 8.0, 3.13 Default Case Algorithms
+// General_Category of Mongolian Vowel Separator is Cf (Format), characters in Cf are Case_Ignorable.
+
+
+// Sigma preceded by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u180E\u03A3".toLocaleLowerCase(),
+  "a\u180E\u03C2",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u180E\u03A3B".toLocaleLowerCase(),
+  "a\u180E\u03C3b",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by LATIN CAPITAL LETTER B"
+);
+
+// Sigma followed by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u03A3\u180E".toLocaleLowerCase(),
+  "a\u03C2\u180E",
+  "Sigma preceded by LATIN CAPITAL LETTER A, followed by MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u03A3\u180EB".toLocaleLowerCase(),
+  "a\u03C3\u180Eb",
+  "Sigma preceded by LATIN CAPITAL LETTER A, followed by MONGOLIAN VOWEL SEPARATOR, LATIN CAPITAL LETTER B"
+);
+
+// Sigma preceded and followed by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u180E\u03A3\u180E".toLocaleLowerCase(),
+  "a\u180E\u03C2\u180E",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u180E\u03A3\u180EB".toLocaleLowerCase(),
+  "a\u180E\u03C3\u180Eb",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by MONGOLIAN VOWEL SEPARATOR, LATIN CAPITAL LETTER B"
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A10.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A10.js
new file mode 100644
index 0000000000..2ded16975e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A10.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLocaleLowerCase.length property has the attribute
+    ReadOnly
+es5id: 15.5.4.17_A10
+description: >
+    Checking if varying the String.prototype.toLocaleLowerCase.length
+    property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toLocaleLowerCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.toLocaleLowerCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLocaleLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.toLocaleLowerCase.length;
+
+verifyNotWritable(String.prototype.toLocaleLowerCase, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLocaleLowerCase.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.toLocaleLowerCase.length; String.prototype.toLocaleLowerCase.length = function(){return "shifted";}; String.prototype.toLocaleLowerCase.length === __obj. Actual: ' + String.prototype.toLocaleLowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A11.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A11.js
new file mode 100644
index 0000000000..debab23e39
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the toLocaleLowerCase method is 0
+es5id: 15.5.4.17_A11
+description: Checking String.prototype.toLocaleLowerCase.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toLocaleLowerCase.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.toLocaleLowerCase.hasOwnProperty("length") return true. Actual: ' + String.prototype.toLocaleLowerCase.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLocaleLowerCase.length !== 0) {
+  throw new Test262Error('#2: String.prototype.toLocaleLowerCase.length === 0. Actual: ' + String.prototype.toLocaleLowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T1.js
new file mode 100644
index 0000000000..a1c589a0a7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T1
+description: Arguments is true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toLocaleLowerCase() !== "true") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.toLocaleLowerCase = String.prototype.toLocaleLowerCase;  __instance.toLocaleLowerCase() === "true". Actual: ' + __instance.toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T10.js
new file mode 100644
index 0000000000..bcf3194fdf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T10.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T10
+description: >
+    Call toLocaleLowerCase() function of object with overrode toString
+    function
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+__obj.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toLocaleLowerCase() !== "ab") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return "\u0041B";}}; __obj.toLocaleLowerCase = String.prototype.toLocaleLowerCase; __obj.toLocaleLowerCase() ==="ab". Actual: ' + __obj.toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T11.js
new file mode 100644
index 0000000000..a5e13954aa
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T11.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T11
+description: >
+    Override toString function, toString throw exception, then call
+    toLocaleLowerCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+}
+__obj.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toLocaleLowerCase();
+  throw new Test262Error('#1: "var x = __obj.toLocaleLowerCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T12.js
new file mode 100644
index 0000000000..05b7bebbfd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T12.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T12
+description: >
+    Override toString and valueOf functions, valueOf throw exception,
+    then call toLocaleLowerCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+}
+__obj.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toLocaleLowerCase();
+  throw new Test262Error('#1: "var x = __obj.toLocaleLowerCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T13.js
new file mode 100644
index 0000000000..83236032ed
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T13.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T13
+description: >
+    Override toString and valueOf functions, then call
+    toLocaleLowerCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return 1;
+  }
+}
+__obj.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toLocaleLowerCase() !== "1") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toLocaleLowerCase = String.prototype.toLocaleLowerCase; __obj.toLocaleLowerCase() ==="1". Actual: ' + __obj.toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__obj.toLocaleLowerCase().length !== 1) {
+  throw new Test262Error('#2: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toLocaleLowerCase = String.prototype.toLocaleLowerCase; __obj.toLocaleLowerCase().length === 1. Actual: ' + __obj.toLocaleLowerCase().length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T14.js
new file mode 100644
index 0000000000..99fdc2b935
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T14.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T14
+description: Call toLocaleLowerCase() function for RegExp object
+---*/
+
+var __reg = new RegExp("ABC");
+__reg.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__reg.toLocaleLowerCase() !== "/abc/") {
+  throw new Test262Error('#1: var __reg = new RegExp("ABC"); __reg.toLocaleLowerCase = String.prototype.toLocaleLowerCase; __reg.toLocaleLowerCase() === "/abc/". Actual: ' + __reg.toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T2.js
new file mode 100644
index 0000000000..4d1fa0e042
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T2.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T2
+description: Instance is Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toLocaleLowerCase() !== "false") {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.toLocaleLowerCase = String.prototype.toLocaleLowerCase;  __instance.toLocaleLowerCase() === "false". Actual: ' + __instance.toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T3.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T3.js
new file mode 100644
index 0000000000..9798385f74
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T3.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T3
+description: Checking by using eval
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (eval("\"BJ\"").toLocaleLowerCase() !== "bj") {
+  throw new Test262Error('#1: eval("\\"BJ\\"").toLocaleLowerCase() === "bj". Actual: ' + eval("\"BJ\"").toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T4.js
new file mode 100644
index 0000000000..5dccd7105f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T4.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T4
+description: >
+    Call toLocaleLowerCase() function without arguments of string and
+    from empty string
+---*/
+
+var __lowerCase = "".toLocaleLowerCase();
+
+var __expected = "";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__lowerCase.length !== __expected.length) {
+  throw new Test262Error('#1: __lowerCase = "".toLocaleLowerCase(); __expected = ""; __lowerCase.length === __expected.length. Actual: ' + __lowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__lowerCase.index !== __expected.index) {
+  throw new Test262Error('#2: __lowerCase = "".toLocaleLowerCase(); __expected = ""; __lowerCase.index === __expected.index. Actual: ' + __lowerCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__lowerCase.input !== __expected.input) {
+  throw new Test262Error('#3: __lowerCase = "".toLocaleLowerCase(); __expected = ""; __lowerCase.input === __expected.input. Actual: ' + __lowerCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__lowerCase[0] !== __expected[0]) {
+  throw new Test262Error('#4: __lowerCase = "".toLocaleLowerCase(); __expected = ""; __lowerCase[0]===__expected[0]. Actual: ' + __lowerCase[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T5.js
new file mode 100644
index 0000000000..34618bd677
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T5
+description: Call toLocaleLowerCase() function for function call
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" match(null) evaluates to match("null")
+if (function() {
+    return "GnulLuNa"
+  }().toLocaleLowerCase() !== "gnulluna") {
+  throw new Test262Error('#1: function(){return "GnulLuNa"}().toLocaleLowerCase() === "gnulluna". Actual: ' + function() {
+    return "GnulLuNa"
+  }().toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T6.js
new file mode 100644
index 0000000000..0268b030e4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T6.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T6
+description: Call toLocaleLowerCase() function of Number.NEGATIVE_INFINITY
+---*/
+
+Number.prototype.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ((Number.NEGATIVE_INFINITY).toLocaleLowerCase() !== "-infinity") {
+  throw new Test262Error('#1: Number.prototype.toLocaleLowerCase = String.prototype.toLocaleLowerCase; (Number.NEGATIVE_INFINITY).toLocaleLowerCase() === "-infinity". Actual: ' + (Number.NEGATIVE_INFINITY).toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T7.js
new file mode 100644
index 0000000000..285ee723ec
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T7
+description: Call toLocaleLowerCase() function of NaN
+---*/
+
+Number.prototype.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (NaN.toLocaleLowerCase() !== "nan") {
+  throw new Test262Error('#1: Number.prototype.toLocaleLowerCase = String.prototype.toLocaleLowerCase; NaN.toLocaleLowerCase()=== "nan". Actual: ' + NaN.toLocaleLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T8.js
new file mode 100644
index 0000000000..1967c6547d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T8.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T8
+description: Call toLocaleLowerCase() function of Infinity
+---*/
+
+Number.prototype.toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+if (Infinity.toLocaleLowerCase() !== "infinity") {
+  throw new Test262Error('#1: Number.prototype.toLocaleLowerCase = String.prototype.toLocaleLowerCase; Infinity.toLocaleLowerCase()=== "infinity". Actual: ' + Infinity.toLocaleLowerCase());
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T9.js
new file mode 100644
index 0000000000..9defa73f86
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A1_T9.js
@@ -0,0 +1,54 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase()
+es5id: 15.5.4.17_A1_T9
+description: Call toLocaleLowerCase() function of string object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+var __lowerCase = new String(__obj).toLocaleLowerCase();
+
+
+var __expected = "undefined";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__lowerCase.length !== __expected.length) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleLowerCase(); __expected ="undefined"; __lowerCase.length === __expected.length. Actual: ' + __lowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__lowerCase.index !== __expected.index) {
+  throw new Test262Error('#2: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleLowerCase(); __expected ="undefined"; __lowerCase.index === __expected.index. Actual: ' + __lowerCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__lowerCase.input !== __expected.input) {
+  throw new Test262Error('#3: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleLowerCase(); __expected ="undefined"; __lowerCase.input === __expected.input. Actual: ' + __lowerCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__lowerCase[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleLowerCase(); __expected ="undefined"; __lowerCase[' + index + ']=== ' + __expected[index] + '. Actual: ' + __lowerCase[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A2_T1.js
new file mode 100644
index 0000000000..7dfdb60f3e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A2_T1.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.toLocaleLowerCase() return a string, but not a String
+    object
+es5id: 15.5.4.17_A2_T1
+description: Checking returned result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("Hello, WoRlD!".toLocaleLowerCase() !== "hello, world!") {
+  throw new Test262Error('#1: "Hello, WoRlD!".toLocaleLowerCase() === "hello, world!". Actual: ' + ("Hello, WoRlD!".toLocaleLowerCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if ("Hello, WoRlD!".toLocaleLowerCase() !== String("hello, world!")) {
+  throw new Test262Error('#2: "Hello, WoRlD!".toLocaleLowerCase() === String("hello, world!"). Actual: ' + ("Hello, WoRlD!".toLocaleLowerCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if ("Hello, WoRlD!".toLocaleLowerCase() === new String("hello, world!")) {
+  throw new Test262Error('#3: "Hello, WoRlD!".toLocaleLowerCase() !== new String("hello, world!")');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A6.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A6.js
new file mode 100644
index 0000000000..dadbf9893d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase has not prototype property
+es5id: 15.5.4.17_A6
+description: Checking String.prototype.toLocaleLowerCase.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.toLocaleLowerCase.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.toLocaleLowerCase.prototype === undefined. Actual: ' + String.prototype.toLocaleLowerCase.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A7.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A7.js
new file mode 100644
index 0000000000..48e315755d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A7.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleLowerCase can't be used as constructor
+es5id: 15.5.4.17_A7
+description: >
+    Checking if creating the String.prototype.toLocaleLowerCase object
+    fails
+---*/
+
+var __FACTORY = String.prototype.toLocaleLowerCase;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: var __FACTORY = String.prototype.toLocaleLowerCase; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.1: var __FACTORY = String.prototype.toLocaleLowerCase; "var __instance = new __FACTORY" throw a TypeError. Actual: ' + (e));
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A8.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A8.js
new file mode 100644
index 0000000000..fc35b73e84
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A8.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLocaleLowerCase.length property has the attribute
+    DontEnum
+es5id: 15.5.4.17_A8
+description: >
+    Checking if enumerating the
+    String.prototype.toLocaleLowerCase.length property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toLocaleLowerCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toLocaleLowerCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLocaleLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.toLocaleLowerCase.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.toLocaleLowerCase.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.toLocaleLowerCase) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.toLocaleLowerCase){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A9.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A9.js
new file mode 100644
index 0000000000..3e03922bc8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/S15.5.4.17_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLocaleLowerCase.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.17_A9
+description: >
+    Checking if deleting the String.prototype.toLocaleLowerCase.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toLocaleLowerCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toLocaleLowerCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLocaleLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.toLocaleLowerCase.length) {
+  throw new Test262Error('#1: delete String.prototype.toLocaleLowerCase.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLocaleLowerCase.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.toLocaleLowerCase.length; String.prototype.toLocaleLowerCase.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.toLocaleLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/browser.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/name.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/name.js
new file mode 100644
index 0000000000..0293ba687b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.20
+description: >
+  String.prototype.toLocaleLowerCase.name is "toLocaleLowerCase".
+info: |
+  String.prototype.toLocaleLowerCase ( [ reserved1 [ , reserved2 ] ] )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.toLocaleLowerCase.name, "toLocaleLowerCase");
+
+verifyNotEnumerable(String.prototype.toLocaleLowerCase, "name");
+verifyNotWritable(String.prototype.toLocaleLowerCase, "name");
+verifyConfigurable(String.prototype.toLocaleLowerCase, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/not-a-constructor.js
new file mode 100644
index 0000000000..c6b26ea910
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.toLocaleLowerCase does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.toLocaleLowerCase),
+  false,
+  'isConstructor(String.prototype.toLocaleLowerCase) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.toLocaleLowerCase();
+}, '`new String.prototype.toLocaleLowerCase()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/shell.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/special_casing.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/special_casing.js
new file mode 100644
index 0000000000..43cfaa1a9e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/special_casing.js
@@ -0,0 +1,138 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Check if String.prototype.toLocaleLowerCase supports mappings defined in SpecialCasings
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+es5id: 15.5.4.17
+es6id: 21.1.3.20
+---*/
+
+// SpecialCasing.txt, except for conditional mappings.
+
+assert.sameValue("\u00DF".toLocaleLowerCase(), "\u00DF", "LATIN SMALL LETTER SHARP S");
+
+// Locale-sensitive for Turkish and Azeri.
+// assert.sameValue("\u0130".toLocaleLowerCase(), "\u0069\u0307", "LATIN CAPITAL LETTER I WITH DOT ABOVE");
+
+assert.sameValue("\uFB00".toLocaleLowerCase(), "\uFB00", "LATIN SMALL LIGATURE FF");
+assert.sameValue("\uFB01".toLocaleLowerCase(), "\uFB01", "LATIN SMALL LIGATURE FI");
+assert.sameValue("\uFB02".toLocaleLowerCase(), "\uFB02", "LATIN SMALL LIGATURE FL");
+assert.sameValue("\uFB03".toLocaleLowerCase(), "\uFB03", "LATIN SMALL LIGATURE FFI");
+assert.sameValue("\uFB04".toLocaleLowerCase(), "\uFB04", "LATIN SMALL LIGATURE FFL");
+assert.sameValue("\uFB05".toLocaleLowerCase(), "\uFB05", "LATIN SMALL LIGATURE LONG S T");
+assert.sameValue("\uFB06".toLocaleLowerCase(), "\uFB06", "LATIN SMALL LIGATURE ST");
+
+assert.sameValue("\u0587".toLocaleLowerCase(), "\u0587", "ARMENIAN SMALL LIGATURE ECH YIWN");
+assert.sameValue("\uFB13".toLocaleLowerCase(), "\uFB13", "ARMENIAN SMALL LIGATURE MEN NOW");
+assert.sameValue("\uFB14".toLocaleLowerCase(), "\uFB14", "ARMENIAN SMALL LIGATURE MEN ECH");
+assert.sameValue("\uFB15".toLocaleLowerCase(), "\uFB15", "ARMENIAN SMALL LIGATURE MEN INI");
+assert.sameValue("\uFB16".toLocaleLowerCase(), "\uFB16", "ARMENIAN SMALL LIGATURE VEW NOW");
+assert.sameValue("\uFB17".toLocaleLowerCase(), "\uFB17", "ARMENIAN SMALL LIGATURE MEN XEH");
+
+assert.sameValue("\u0149".toLocaleLowerCase(), "\u0149", "LATIN SMALL LETTER N PRECEDED BY APOSTROPHE");
+
+assert.sameValue("\u0390".toLocaleLowerCase(), "\u0390", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS");
+assert.sameValue("\u03B0".toLocaleLowerCase(), "\u03B0", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS");
+
+assert.sameValue("\u01F0".toLocaleLowerCase(), "\u01F0", "LATIN SMALL LETTER J WITH CARON");
+assert.sameValue("\u1E96".toLocaleLowerCase(), "\u1E96", "LATIN SMALL LETTER H WITH LINE BELOW");
+assert.sameValue("\u1E97".toLocaleLowerCase(), "\u1E97", "LATIN SMALL LETTER T WITH DIAERESIS");
+assert.sameValue("\u1E98".toLocaleLowerCase(), "\u1E98", "LATIN SMALL LETTER W WITH RING ABOVE");
+assert.sameValue("\u1E99".toLocaleLowerCase(), "\u1E99", "LATIN SMALL LETTER Y WITH RING ABOVE");
+assert.sameValue("\u1E9A".toLocaleLowerCase(), "\u1E9A", "LATIN SMALL LETTER A WITH RIGHT HALF RING");
+
+assert.sameValue("\u1F50".toLocaleLowerCase(), "\u1F50", "GREEK SMALL LETTER UPSILON WITH PSILI");
+assert.sameValue("\u1F52".toLocaleLowerCase(), "\u1F52", "GREEK SMALL LETTER UPSILON WITH PSILI AND VARIA");
+assert.sameValue("\u1F54".toLocaleLowerCase(), "\u1F54", "GREEK SMALL LETTER UPSILON WITH PSILI AND OXIA");
+assert.sameValue("\u1F56".toLocaleLowerCase(), "\u1F56", "GREEK SMALL LETTER UPSILON WITH PSILI AND PERISPOMENI");
+assert.sameValue("\u1FB6".toLocaleLowerCase(), "\u1FB6", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI");
+assert.sameValue("\u1FC6".toLocaleLowerCase(), "\u1FC6", "GREEK SMALL LETTER ETA WITH PERISPOMENI");
+assert.sameValue("\u1FD2".toLocaleLowerCase(), "\u1FD2", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FD3".toLocaleLowerCase(), "\u1FD3", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FD6".toLocaleLowerCase(), "\u1FD6", "GREEK SMALL LETTER IOTA WITH PERISPOMENI");
+assert.sameValue("\u1FD7".toLocaleLowerCase(), "\u1FD7", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FE2".toLocaleLowerCase(), "\u1FE2", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FE3".toLocaleLowerCase(), "\u1FE3", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FE4".toLocaleLowerCase(), "\u1FE4", "GREEK SMALL LETTER RHO WITH PSILI");
+assert.sameValue("\u1FE6".toLocaleLowerCase(), "\u1FE6", "GREEK SMALL LETTER UPSILON WITH PERISPOMENI");
+assert.sameValue("\u1FE7".toLocaleLowerCase(), "\u1FE7", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FF6".toLocaleLowerCase(), "\u1FF6", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI");
+
+assert.sameValue("\u1F80".toLocaleLowerCase(), "\u1F80", "GREEK SMALL LETTER ALPHA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F81".toLocaleLowerCase(), "\u1F81", "GREEK SMALL LETTER ALPHA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F82".toLocaleLowerCase(), "\u1F82", "GREEK SMALL LETTER ALPHA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F83".toLocaleLowerCase(), "\u1F83", "GREEK SMALL LETTER ALPHA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F84".toLocaleLowerCase(), "\u1F84", "GREEK SMALL LETTER ALPHA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F85".toLocaleLowerCase(), "\u1F85", "GREEK SMALL LETTER ALPHA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F86".toLocaleLowerCase(), "\u1F86", "GREEK SMALL LETTER ALPHA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F87".toLocaleLowerCase(), "\u1F87", "GREEK SMALL LETTER ALPHA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F88".toLocaleLowerCase(), "\u1F80", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F89".toLocaleLowerCase(), "\u1F81", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8A".toLocaleLowerCase(), "\u1F82", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8B".toLocaleLowerCase(), "\u1F83", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8C".toLocaleLowerCase(), "\u1F84", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8D".toLocaleLowerCase(), "\u1F85", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8E".toLocaleLowerCase(), "\u1F86", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8F".toLocaleLowerCase(), "\u1F87", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1F90".toLocaleLowerCase(), "\u1F90", "GREEK SMALL LETTER ETA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F91".toLocaleLowerCase(), "\u1F91", "GREEK SMALL LETTER ETA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F92".toLocaleLowerCase(), "\u1F92", "GREEK SMALL LETTER ETA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F93".toLocaleLowerCase(), "\u1F93", "GREEK SMALL LETTER ETA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F94".toLocaleLowerCase(), "\u1F94", "GREEK SMALL LETTER ETA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F95".toLocaleLowerCase(), "\u1F95", "GREEK SMALL LETTER ETA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F96".toLocaleLowerCase(), "\u1F96", "GREEK SMALL LETTER ETA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F97".toLocaleLowerCase(), "\u1F97", "GREEK SMALL LETTER ETA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F98".toLocaleLowerCase(), "\u1F90", "GREEK CAPITAL LETTER ETA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F99".toLocaleLowerCase(), "\u1F91", "GREEK CAPITAL LETTER ETA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9A".toLocaleLowerCase(), "\u1F92", "GREEK CAPITAL LETTER ETA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9B".toLocaleLowerCase(), "\u1F93", "GREEK CAPITAL LETTER ETA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9C".toLocaleLowerCase(), "\u1F94", "GREEK CAPITAL LETTER ETA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9D".toLocaleLowerCase(), "\u1F95", "GREEK CAPITAL LETTER ETA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9E".toLocaleLowerCase(), "\u1F96", "GREEK CAPITAL LETTER ETA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9F".toLocaleLowerCase(), "\u1F97", "GREEK CAPITAL LETTER ETA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FA0".toLocaleLowerCase(), "\u1FA0", "GREEK SMALL LETTER OMEGA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA1".toLocaleLowerCase(), "\u1FA1", "GREEK SMALL LETTER OMEGA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA2".toLocaleLowerCase(), "\u1FA2", "GREEK SMALL LETTER OMEGA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA3".toLocaleLowerCase(), "\u1FA3", "GREEK SMALL LETTER OMEGA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA4".toLocaleLowerCase(), "\u1FA4", "GREEK SMALL LETTER OMEGA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA5".toLocaleLowerCase(), "\u1FA5", "GREEK SMALL LETTER OMEGA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA6".toLocaleLowerCase(), "\u1FA6", "GREEK SMALL LETTER OMEGA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA7".toLocaleLowerCase(), "\u1FA7", "GREEK SMALL LETTER OMEGA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FA8".toLocaleLowerCase(), "\u1FA0", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FA9".toLocaleLowerCase(), "\u1FA1", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAA".toLocaleLowerCase(), "\u1FA2", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAB".toLocaleLowerCase(), "\u1FA3", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAC".toLocaleLowerCase(), "\u1FA4", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAD".toLocaleLowerCase(), "\u1FA5", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAE".toLocaleLowerCase(), "\u1FA6", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAF".toLocaleLowerCase(), "\u1FA7", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB3".toLocaleLowerCase(), "\u1FB3", "GREEK SMALL LETTER ALPHA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FBC".toLocaleLowerCase(), "\u1FB3", "GREEK CAPITAL LETTER ALPHA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FC3".toLocaleLowerCase(), "\u1FC3", "GREEK SMALL LETTER ETA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FCC".toLocaleLowerCase(), "\u1FC3", "GREEK CAPITAL LETTER ETA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FF3".toLocaleLowerCase(), "\u1FF3", "GREEK SMALL LETTER OMEGA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FFC".toLocaleLowerCase(), "\u1FF3", "GREEK CAPITAL LETTER OMEGA WITH PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB2".toLocaleLowerCase(), "\u1FB2", "GREEK SMALL LETTER ALPHA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FB4".toLocaleLowerCase(), "\u1FB4", "GREEK SMALL LETTER ALPHA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC2".toLocaleLowerCase(), "\u1FC2", "GREEK SMALL LETTER ETA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC4".toLocaleLowerCase(), "\u1FC4", "GREEK SMALL LETTER ETA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF2".toLocaleLowerCase(), "\u1FF2", "GREEK SMALL LETTER OMEGA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF4".toLocaleLowerCase(), "\u1FF4", "GREEK SMALL LETTER OMEGA WITH OXIA AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FB7".toLocaleLowerCase(), "\u1FB7", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC7".toLocaleLowerCase(), "\u1FC7", "GREEK SMALL LETTER ETA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF7".toLocaleLowerCase(), "\u1FF7", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI AND YPOGEGRAMMENI");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/special_casing_conditional.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/special_casing_conditional.js
new file mode 100644
index 0000000000..eaa101eeb9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/special_casing_conditional.js
@@ -0,0 +1,103 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Check if String.prototype.toLocaleLowerCase supports conditional mappings defined in SpecialCasings
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+es5id: 15.5.4.17
+es6id: 21.1.3.20
+---*/
+
+// SpecialCasing.txt, conditional, language-insensitive mappings.
+
+// <code>; <lower>; <title>; <upper>; (<condition_list>;)? # <comment>
+// 03A3; 03C2; 03A3; 03A3; Final_Sigma; # GREEK CAPITAL LETTER SIGMA
+// 03A3; 03C3; 03A3; 03A3; # GREEK CAPITAL LETTER SIGMA
+
+// Final_Sigma is defined in Unicode 5.1, 3.13 Default Case Algorithms.
+
+assert.sameValue(
+  "\u03A3".toLocaleLowerCase(),
+  "\u03C3",
+  "Single GREEK CAPITAL LETTER SIGMA"
+);
+
+// Sigma preceded by Cased and zero or more Case_Ignorable.
+assert.sameValue(
+  "A\u03A3".toLocaleLowerCase(),
+  "a\u03C2",
+  "Sigma preceded by LATIN CAPITAL LETTER A"
+);
+assert.sameValue(
+  "\uD835\uDCA2\u03A3".toLocaleLowerCase(),
+  "\uD835\uDCA2\u03C2",
+  "Sigma preceded by MATHEMATICAL SCRIPT CAPITAL G (D835 DCA2 = 1D4A2)"
+);
+assert.sameValue(
+  "A.\u03A3".toLocaleLowerCase(),
+  "a.\u03C2",
+  "Sigma preceded by FULL STOP"
+);
+assert.sameValue(
+  "A\u00AD\u03A3".toLocaleLowerCase(),
+  "a\u00AD\u03C2",
+  "Sigma preceded by SOFT HYPHEN (00AD)"
+);
+assert.sameValue(
+  "A\uD834\uDE42\u03A3".toLocaleLowerCase(),
+  "a\uD834\uDE42\u03C2",
+  "Sigma preceded by COMBINING GREEK MUSICAL TRISEME (D834 DE42 = 1D242)"
+);
+assert.sameValue(
+  "\u0345\u03A3".toLocaleLowerCase(),
+  "\u0345\u03C3",
+  "Sigma preceded by COMBINING GREEK YPOGEGRAMMENI (0345)"
+);
+assert.sameValue(
+  "\u0391\u0345\u03A3".toLocaleLowerCase(),
+  "\u03B1\u0345\u03C2",
+  "Sigma preceded by GREEK CAPITAL LETTER ALPHA (0391), COMBINING GREEK YPOGEGRAMMENI (0345)"
+);
+
+// Sigma not followed by zero or more Case_Ignorable and then Cased.
+assert.sameValue(
+  "A\u03A3B".toLocaleLowerCase(),
+  "a\u03C3b",
+  "Sigma followed by LATIN CAPITAL LETTER B"
+);
+assert.sameValue(
+  "A\u03A3\uD835\uDCA2".toLocaleLowerCase(),
+  "a\u03C3\uD835\uDCA2",
+  "Sigma followed by MATHEMATICAL SCRIPT CAPITAL G (D835 DCA2 = 1D4A2)"
+);
+assert.sameValue(
+  "A\u03A3.b".toLocaleLowerCase(),
+  "a\u03C3.b",
+  "Sigma followed by FULL STOP"
+);
+assert.sameValue(
+  "A\u03A3\u00ADB".toLocaleLowerCase(),
+  "a\u03C3\u00ADb",
+  "Sigma followed by SOFT HYPHEN (00AD)"
+);
+assert.sameValue(
+  "A\u03A3\uD834\uDE42B".toLocaleLowerCase(),
+  "a\u03C3\uD834\uDE42b",
+  "Sigma followed by COMBINING GREEK MUSICAL TRISEME (D834 DE42 = 1D242)"
+);
+assert.sameValue(
+  "A\u03A3\u0345".toLocaleLowerCase(),
+  "a\u03C2\u0345",
+  "Sigma followed by COMBINING GREEK YPOGEGRAMMENI (0345)"
+);
+assert.sameValue(
+  "A\u03A3\u0345\u0391".toLocaleLowerCase(),
+  "a\u03C3\u0345\u03B1",
+  "Sigma followed by COMBINING GREEK YPOGEGRAMMENI (0345), GREEK CAPITAL LETTER ALPHA (0391)"
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/supplementary_plane.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/supplementary_plane.js
new file mode 100644
index 0000000000..0c5be957a4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/supplementary_plane.js
@@ -0,0 +1,66 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: String.prototype.toLocaleLowerCase() iterates over code points
+info: |
+    21.1.3.20 String.prototype.toLocaleLowerCase()
+    ...
+    This function interprets a String value as a sequence of UTF-16 encoded
+    code points, as described in 6.1.4.
+
+    This function works exactly the same as toLowerCase [...].
+
+    21.1.3.20 String.prototype.toLowerCase ( )
+
+    ...
+    4. Let cpList be a List containing in order the code points as defined in
+       6.1.4 of S, starting at the first element of S.
+    5. For each code point c in cpList, if the Unicode Character Database
+       provides a language insensitive lower case equivalent of c then replace
+       c in cpList with that equivalent code point(s).
+es6id: 21.1.3.20
+---*/
+
+assert.sameValue("\uD801\uDC00".toLocaleLowerCase(), "\uD801\uDC28", "DESERET CAPITAL LETTER LONG I");
+assert.sameValue("\uD801\uDC01".toLocaleLowerCase(), "\uD801\uDC29", "DESERET CAPITAL LETTER LONG E");
+assert.sameValue("\uD801\uDC02".toLocaleLowerCase(), "\uD801\uDC2A", "DESERET CAPITAL LETTER LONG A");
+assert.sameValue("\uD801\uDC03".toLocaleLowerCase(), "\uD801\uDC2B", "DESERET CAPITAL LETTER LONG AH");
+assert.sameValue("\uD801\uDC04".toLocaleLowerCase(), "\uD801\uDC2C", "DESERET CAPITAL LETTER LONG O");
+assert.sameValue("\uD801\uDC05".toLocaleLowerCase(), "\uD801\uDC2D", "DESERET CAPITAL LETTER LONG OO");
+assert.sameValue("\uD801\uDC06".toLocaleLowerCase(), "\uD801\uDC2E", "DESERET CAPITAL LETTER SHORT I");
+assert.sameValue("\uD801\uDC07".toLocaleLowerCase(), "\uD801\uDC2F", "DESERET CAPITAL LETTER SHORT E");
+assert.sameValue("\uD801\uDC08".toLocaleLowerCase(), "\uD801\uDC30", "DESERET CAPITAL LETTER SHORT A");
+assert.sameValue("\uD801\uDC09".toLocaleLowerCase(), "\uD801\uDC31", "DESERET CAPITAL LETTER SHORT AH");
+assert.sameValue("\uD801\uDC0A".toLocaleLowerCase(), "\uD801\uDC32", "DESERET CAPITAL LETTER SHORT O");
+assert.sameValue("\uD801\uDC0B".toLocaleLowerCase(), "\uD801\uDC33", "DESERET CAPITAL LETTER SHORT OO");
+assert.sameValue("\uD801\uDC0C".toLocaleLowerCase(), "\uD801\uDC34", "DESERET CAPITAL LETTER AY");
+assert.sameValue("\uD801\uDC0D".toLocaleLowerCase(), "\uD801\uDC35", "DESERET CAPITAL LETTER OW");
+assert.sameValue("\uD801\uDC0E".toLocaleLowerCase(), "\uD801\uDC36", "DESERET CAPITAL LETTER WU");
+assert.sameValue("\uD801\uDC0F".toLocaleLowerCase(), "\uD801\uDC37", "DESERET CAPITAL LETTER YEE");
+assert.sameValue("\uD801\uDC10".toLocaleLowerCase(), "\uD801\uDC38", "DESERET CAPITAL LETTER H");
+assert.sameValue("\uD801\uDC11".toLocaleLowerCase(), "\uD801\uDC39", "DESERET CAPITAL LETTER PEE");
+assert.sameValue("\uD801\uDC12".toLocaleLowerCase(), "\uD801\uDC3A", "DESERET CAPITAL LETTER BEE");
+assert.sameValue("\uD801\uDC13".toLocaleLowerCase(), "\uD801\uDC3B", "DESERET CAPITAL LETTER TEE");
+assert.sameValue("\uD801\uDC14".toLocaleLowerCase(), "\uD801\uDC3C", "DESERET CAPITAL LETTER DEE");
+assert.sameValue("\uD801\uDC15".toLocaleLowerCase(), "\uD801\uDC3D", "DESERET CAPITAL LETTER CHEE");
+assert.sameValue("\uD801\uDC16".toLocaleLowerCase(), "\uD801\uDC3E", "DESERET CAPITAL LETTER JEE");
+assert.sameValue("\uD801\uDC17".toLocaleLowerCase(), "\uD801\uDC3F", "DESERET CAPITAL LETTER KAY");
+assert.sameValue("\uD801\uDC18".toLocaleLowerCase(), "\uD801\uDC40", "DESERET CAPITAL LETTER GAY");
+assert.sameValue("\uD801\uDC19".toLocaleLowerCase(), "\uD801\uDC41", "DESERET CAPITAL LETTER EF");
+assert.sameValue("\uD801\uDC1A".toLocaleLowerCase(), "\uD801\uDC42", "DESERET CAPITAL LETTER VEE");
+assert.sameValue("\uD801\uDC1B".toLocaleLowerCase(), "\uD801\uDC43", "DESERET CAPITAL LETTER ETH");
+assert.sameValue("\uD801\uDC1C".toLocaleLowerCase(), "\uD801\uDC44", "DESERET CAPITAL LETTER THEE");
+assert.sameValue("\uD801\uDC1D".toLocaleLowerCase(), "\uD801\uDC45", "DESERET CAPITAL LETTER ES");
+assert.sameValue("\uD801\uDC1E".toLocaleLowerCase(), "\uD801\uDC46", "DESERET CAPITAL LETTER ZEE");
+assert.sameValue("\uD801\uDC1F".toLocaleLowerCase(), "\uD801\uDC47", "DESERET CAPITAL LETTER ESH");
+assert.sameValue("\uD801\uDC20".toLocaleLowerCase(), "\uD801\uDC48", "DESERET CAPITAL LETTER ZHEE");
+assert.sameValue("\uD801\uDC21".toLocaleLowerCase(), "\uD801\uDC49", "DESERET CAPITAL LETTER ER");
+assert.sameValue("\uD801\uDC22".toLocaleLowerCase(), "\uD801\uDC4A", "DESERET CAPITAL LETTER EL");
+assert.sameValue("\uD801\uDC23".toLocaleLowerCase(), "\uD801\uDC4B", "DESERET CAPITAL LETTER EM");
+assert.sameValue("\uD801\uDC24".toLocaleLowerCase(), "\uD801\uDC4C", "DESERET CAPITAL LETTER EN");
+assert.sameValue("\uD801\uDC25".toLocaleLowerCase(), "\uD801\uDC4D", "DESERET CAPITAL LETTER ENG");
+assert.sameValue("\uD801\uDC26".toLocaleLowerCase(), "\uD801\uDC4E", "DESERET CAPITAL LETTER OI");
+assert.sameValue("\uD801\uDC27".toLocaleLowerCase(), "\uD801\uDC4F", "DESERET CAPITAL LETTER EW");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..9998f32056
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleLowerCase/this-value-not-obj-coercible.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.tolocalelowercase
+description: The "this" value must be object-coercible
+info: |
+  This function works exactly the same as toLowerCase except that its result is
+  intended to yield the correct result for the host environment's current
+  locale, rather than a locale-independent result.
+
+  21.1.3.24 String.prototype.toLowerCase
+
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var toLocaleLowerCase = String.prototype.toLocaleLowerCase;
+
+assert.sameValue(typeof toLocaleLowerCase, 'function');
+
+assert.throws(TypeError, function() {
+  toLocaleLowerCase.call(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  toLocaleLowerCase.call(null);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A10.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A10.js
new file mode 100644
index 0000000000..07ac6f90b7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A10.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLocaleUpperCase.length property has the attribute
+    ReadOnly
+es5id: 15.5.4.19_A10
+description: >
+    Checking if varying the String.prototype.toLocaleUpperCase.length
+    property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toLocaleUpperCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.toLocaleUpperCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLocaleUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.toLocaleUpperCase.length;
+
+verifyNotWritable(String.prototype.toLocaleUpperCase, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLocaleUpperCase.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.toLocaleUpperCase.length; String.prototype.toLocaleUpperCase.length = function(){return "shifted";}; String.prototype.toLocaleUpperCase.length === __obj. Actual: ' + String.prototype.toLocaleUpperCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A11.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A11.js
new file mode 100644
index 0000000000..24681ed604
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the toLocaleUpperCase method is 0
+es5id: 15.5.4.19_A11
+description: Checking String.prototype.toLocaleUpperCase.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toLocaleUpperCase.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.toLocaleUpperCase.hasOwnProperty("length") return true. Actual: ' + String.prototype.toLocaleUpperCase.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLocaleUpperCase.length !== 0) {
+  throw new Test262Error('#2: String.prototype.toLocaleUpperCase.length === 0. Actual: ' + String.prototype.toLocaleUpperCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T1.js
new file mode 100644
index 0000000000..dfdae2894e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T1
+description: Arguments is true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toLocaleUpperCase() !== "TRUE") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.toLocaleUpperCase = String.prototype.toLocaleUpperCase;  __instance.toLocaleUpperCase() === "TRUE". Actual: ' + __instance.toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T10.js
new file mode 100644
index 0000000000..1548daa7ea
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T10.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T10
+description: >
+    Call toLocaleUpperCase() function of object with overrode toString
+    function
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041b";
+  }
+}
+__obj.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toLocaleUpperCase() !== "AB") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return "\u0041b";}}; __obj.toLocaleUpperCase = String.prototype.toLocaleUpperCase; __obj.toLocaleUpperCase() ==="AB". Actual: ' + __obj.toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T11.js
new file mode 100644
index 0000000000..19d8a43eca
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T11.js
@@ -0,0 +1,31 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T11
+description: >
+    Override toString function, toString throw exception, then call
+    toLocaleUpperCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+}
+__obj.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toLocaleUpperCase();
+  throw new Test262Error('#1: "var x = __obj.toLocaleUpperCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T12.js
new file mode 100644
index 0000000000..250b208e21
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T12.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T12
+description: >
+    Override toString and valueOf functions, valueOf throw exception,
+    then call toLocaleUpperCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+}
+__obj.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toLocaleUpperCase();
+  throw new Test262Error('#1: "var x = __obj.toLocaleUpperCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T13.js
new file mode 100644
index 0000000000..ab19cf326a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T13.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T13
+description: >
+    Override toString and valueOf functions, then call
+    toLocaleUpperCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return 1;
+  }
+}
+__obj.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toLocaleUpperCase() !== "1") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toLocaleUpperCase = String.prototype.toLocaleUpperCase; __obj.toLocaleUpperCase() ==="1". Actual: ' + __obj.toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__obj.toLocaleUpperCase().length !== 1) {
+  throw new Test262Error('#2: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toLocaleUpperCase = String.prototype.toLocaleUpperCase; __obj.toLocaleUpperCase().length === 1. Actual: ' + __obj.toLocaleUpperCase().length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T14.js
new file mode 100644
index 0000000000..c76d70bd29
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T14.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T14
+description: Call toLocaleUpperCase() function for RegExp object
+---*/
+
+var __reg = new RegExp("abc");
+__reg.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__reg.toLocaleUpperCase() !== "/ABC/") {
+  throw new Test262Error('#1: var __reg = new RegExp("abc"); __reg.toLocaleUpperCase = String.prototype.toLocaleUpperCase; __reg.toLocaleUpperCase() === "/ABC/". Actual: ' + __reg.toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T2.js
new file mode 100644
index 0000000000..3fe8267677
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T2.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T2
+description: Instance is Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toLocaleUpperCase() !== "FALSE") {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.toLocaleUpperCase = String.prototype.toLocaleUpperCase;  __instance.toLocaleUpperCase() === "FALSE". Actual: ' + __instance.toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T3.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T3.js
new file mode 100644
index 0000000000..23b5df7c2e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T3.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T3
+description: Checking by using eval
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (eval("\"bj\"").toLocaleUpperCase() !== "BJ") {
+  throw new Test262Error('#1: eval("\\"bj\\"").toLocaleUpperCase() === "BJ". Actual: ' + eval("\"bj\"").toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T4.js
new file mode 100644
index 0000000000..6afd8033f0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T4.js
@@ -0,0 +1,47 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T4
+description: >
+    Call toLocaleUpperCase() function without arguments of string and
+    from empty string
+---*/
+
+var __lowerCase = "".toLocaleUpperCase();
+var __expected = "";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__lowerCase.length !== __expected.length) {
+  throw new Test262Error('#1: __lowerCase = "".toLocaleUpperCase(); __expected = ""; __lowerCase.length === __expected.length. Actual: ' + __lowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__lowerCase.index !== __expected.index) {
+  throw new Test262Error('#2: __lowerCase = "".toLocaleUpperCase(); __expected = ""; __lowerCase.index === __expected.index. Actual: ' + __lowerCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__lowerCase.input !== __expected.input) {
+  throw new Test262Error('#3: __lowerCase = "".toLocaleUpperCase(); __expected = ""; __lowerCase.input === __expected.input. Actual: ' + __lowerCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__lowerCase[0] !== __expected[0]) {
+  throw new Test262Error('#4: __lowerCase = "".toLocaleUpperCase(); __lowerCase[0]===' + __expected[0] + '. Actual: ' + __lowerCase[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T5.js
new file mode 100644
index 0000000000..bc0b5822ca
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T5
+description: Call toLocaleUpperCase() function of function call
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" match(null) evaluates to match("null")
+if (function() {
+    return "GnulLuNa"
+  }().toLocaleUpperCase() !== "GNULLUNA") {
+  throw new Test262Error('#1: function(){return "GnulLuNa"}().toLocaleUpperCase() === "GNULLUNA". Actual: ' + function() {
+    return "GnulLuNa"
+  }().toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T6.js
new file mode 100644
index 0000000000..d72635a568
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T6.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T6
+description: Call toLocaleUpperCase() function of Number.NEGATIVE_INFINITY
+---*/
+
+Number.prototype.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ((Number.NEGATIVE_INFINITY).toLocaleUpperCase() !== "-INFINITY") {
+  throw new Test262Error('#1: Number.prototype.toLocaleUpperCase = String.prototype.toLocaleUpperCase; (Number.NEGATIVE_INFINITY).toLocaleUpperCase() === "-INFINITY". Actual: ' + (Number.NEGATIVE_INFINITY).toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T7.js
new file mode 100644
index 0000000000..87420328a6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T7
+description: Call toLocaleUpperCase() function of NaN
+---*/
+
+Number.prototype.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (NaN.toLocaleUpperCase() !== "NAN") {
+  throw new Test262Error('#1: Number.prototype.toLocaleUpperCase = String.prototype.toLocaleUpperCase; NaN.toLocaleUpperCase()=== "NAN". Actual: ' + NaN.toLocaleUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T8.js
new file mode 100644
index 0000000000..ce1d49011f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T8.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T8
+description: Call toLocaleUpperCase() function of Infinity
+---*/
+
+Number.prototype.toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+
+if (Infinity.toLocaleUpperCase() !== "INFINITY") {
+  throw new Test262Error('#1: Number.prototype.toLocaleUpperCase = String.prototype.toLocaleUpperCase; Infinity.toLocaleUpperCase()=== "INFINITY". Actual: ' + Infinity.toLocaleUpperCase());
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T9.js
new file mode 100644
index 0000000000..644e10bd04
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A1_T9.js
@@ -0,0 +1,53 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase()
+es5id: 15.5.4.19_A1_T9
+description: Call toLocaleUpperCase() function of string object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+var __lowerCase = new String(__obj).toLocaleUpperCase();
+
+var __expected = "UNDEFINED";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__lowerCase.length !== __expected.length) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleUpperCase(); __expected ="UNDEFINED"; __lowerCase.length === __expected.length. Actual: ' + __lowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__lowerCase.index !== __expected.index) {
+  throw new Test262Error('#2: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleUpperCase(); __expected ="UNDEFINED"; __lowerCase.index === __expected.index. Actual: ' + __lowerCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__lowerCase.input !== __expected.input) {
+  throw new Test262Error('#3: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleUpperCase(); __expected ="UNDEFINED"; __lowerCase.input === __expected.input. Actual: ' + __lowerCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__lowerCase[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLocaleUpperCase(); __expected ="UNDEFINED"; __lowerCase[' + index + ']===' + __expected[index] + '. Actual: ' + __lowerCase[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A2_T1.js
new file mode 100644
index 0000000000..5ddf56ba2a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A2_T1.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    String.prototype.toLocaleUpperCase() return a string, but not a String
+    object
+es5id: 15.5.4.19_A2_T1
+description: Checking returned result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("Hello, WoRlD!".toLocaleUpperCase() !== "HELLO, WORLD!") {
+  throw new Test262Error('#1: "Hello, WoRlD!".toLocaleUpperCase() === "HELLO, WORLD!". Actual: ' + ("Hello, WoRlD!".toLocaleUpperCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if ("Hello, WoRlD!".toLocaleUpperCase() !== String("HELLO, WORLD!")) {
+  throw new Test262Error('#2: "Hello, WoRlD!".toLocaleUpperCase() === String("HELLO, WORLD!"). Actual: ' + ("Hello, WoRlD!".toLocaleUpperCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if ("Hello, WoRlD!".toLocaleUpperCase() === new String("HELLO, WORLD!")) {
+  throw new Test262Error('#3: "Hello, WoRlD!".toLocaleUpperCase() !== new String("HELLO, WORLD!"');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A6.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A6.js
new file mode 100644
index 0000000000..d2ad63105b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase has not prototype property
+es5id: 15.5.4.19_A6
+description: Checking String.prototype.toLocaleUpperCase.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.toLocaleUpperCase.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.toLocaleUpperCase.prototype === undefined. Actual: ' + String.prototype.toLocaleUpperCase.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A7.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A7.js
new file mode 100644
index 0000000000..fbde6f1043
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A7.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLocaleUpperCase can't be used as constructor
+es5id: 15.5.4.19_A7
+description: >
+    Checking if creating the String.prototype.toLocaleUpperCase object
+    fails
+---*/
+
+var __FACTORY = String.prototype.toLocaleUpperCase;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: __FACTORY = String.prototype.toLocaleUpperCase; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.1:  var __instance = new __FACTORY;  Object has no construct lead  a TypeError. Actual: ' + (e));
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A8.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A8.js
new file mode 100644
index 0000000000..43939e080b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A8.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLocaleUpperCase.length property has the attribute
+    DontEnum
+es5id: 15.5.4.19_A8
+description: >
+    Checking if enumerating the
+    String.prototype.toLocaleUpperCase.length property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toLocaleUpperCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toLocaleUpperCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLocaleUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.toLocaleUpperCase.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.toLocaleUpperCase.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.toLocaleUpperCase) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.toLocaleUpperCase){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A9.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A9.js
new file mode 100644
index 0000000000..b411014e54
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/S15.5.4.19_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLocaleUpperCase.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.19_A9
+description: >
+    Checking if deleting the String.prototype.toLocaleUpperCase.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toLocaleUpperCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toLocaleUpperCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLocaleUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.toLocaleUpperCase.length) {
+  throw new Test262Error('#1: delete String.prototype.toLocaleUpperCase.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLocaleUpperCase.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.toLocaleUpperCase.length; String.prototype.toLocaleUpperCase.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.toLocaleUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/browser.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/name.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/name.js
new file mode 100644
index 0000000000..e20dd69220
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.21
+description: >
+  String.prototype.toLocaleUpperCase.name is "toLocaleUpperCase".
+info: |
+  String.prototype.toLocaleUpperCase ( [ reserved1 [ , reserved2 ] ] )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.toLocaleUpperCase.name, "toLocaleUpperCase");
+
+verifyNotEnumerable(String.prototype.toLocaleUpperCase, "name");
+verifyNotWritable(String.prototype.toLocaleUpperCase, "name");
+verifyConfigurable(String.prototype.toLocaleUpperCase, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/not-a-constructor.js
new file mode 100644
index 0000000000..2dbfcb12e1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.toLocaleUpperCase does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.toLocaleUpperCase),
+  false,
+  'isConstructor(String.prototype.toLocaleUpperCase) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.toLocaleUpperCase();
+}, '`new String.prototype.toLocaleUpperCase()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/shell.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/special_casing.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/special_casing.js
new file mode 100644
index 0000000000..16edb26757
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/special_casing.js
@@ -0,0 +1,137 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Check if String.prototype.toLocaleUpperCase supports mappings defined in SpecialCasings
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+es5id: 15.5.4.19
+es6id: 21.1.3.21
+---*/
+
+// SpecialCasing.txt, except for conditional mappings.
+
+assert.sameValue("\u00DF".toLocaleUpperCase(), "\u0053\u0053", "LATIN SMALL LETTER SHARP S");
+
+assert.sameValue("\u0130".toLocaleUpperCase(), "\u0130", "LATIN CAPITAL LETTER I WITH DOT ABOVE");
+
+assert.sameValue("\uFB00".toLocaleUpperCase(), "\u0046\u0046", "LATIN SMALL LIGATURE FF");
+assert.sameValue("\uFB01".toLocaleUpperCase(), "\u0046\u0049", "LATIN SMALL LIGATURE FI");
+assert.sameValue("\uFB02".toLocaleUpperCase(), "\u0046\u004C", "LATIN SMALL LIGATURE FL");
+assert.sameValue("\uFB03".toLocaleUpperCase(), "\u0046\u0046\u0049", "LATIN SMALL LIGATURE FFI");
+assert.sameValue("\uFB04".toLocaleUpperCase(), "\u0046\u0046\u004C", "LATIN SMALL LIGATURE FFL");
+assert.sameValue("\uFB05".toLocaleUpperCase(), "\u0053\u0054", "LATIN SMALL LIGATURE LONG S T");
+assert.sameValue("\uFB06".toLocaleUpperCase(), "\u0053\u0054", "LATIN SMALL LIGATURE ST");
+
+assert.sameValue("\u0587".toLocaleUpperCase(), "\u0535\u0552", "ARMENIAN SMALL LIGATURE ECH YIWN");
+assert.sameValue("\uFB13".toLocaleUpperCase(), "\u0544\u0546", "ARMENIAN SMALL LIGATURE MEN NOW");
+assert.sameValue("\uFB14".toLocaleUpperCase(), "\u0544\u0535", "ARMENIAN SMALL LIGATURE MEN ECH");
+assert.sameValue("\uFB15".toLocaleUpperCase(), "\u0544\u053B", "ARMENIAN SMALL LIGATURE MEN INI");
+assert.sameValue("\uFB16".toLocaleUpperCase(), "\u054E\u0546", "ARMENIAN SMALL LIGATURE VEW NOW");
+assert.sameValue("\uFB17".toLocaleUpperCase(), "\u0544\u053D", "ARMENIAN SMALL LIGATURE MEN XEH");
+
+assert.sameValue("\u0149".toLocaleUpperCase(), "\u02BC\u004E", "LATIN SMALL LETTER N PRECEDED BY APOSTROPHE");
+
+assert.sameValue("\u0390".toLocaleUpperCase(), "\u0399\u0308\u0301", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS");
+assert.sameValue("\u03B0".toLocaleUpperCase(), "\u03A5\u0308\u0301", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS");
+
+assert.sameValue("\u01F0".toLocaleUpperCase(), "\u004A\u030C", "LATIN SMALL LETTER J WITH CARON");
+assert.sameValue("\u1E96".toLocaleUpperCase(), "\u0048\u0331", "LATIN SMALL LETTER H WITH LINE BELOW");
+assert.sameValue("\u1E97".toLocaleUpperCase(), "\u0054\u0308", "LATIN SMALL LETTER T WITH DIAERESIS");
+assert.sameValue("\u1E98".toLocaleUpperCase(), "\u0057\u030A", "LATIN SMALL LETTER W WITH RING ABOVE");
+assert.sameValue("\u1E99".toLocaleUpperCase(), "\u0059\u030A", "LATIN SMALL LETTER Y WITH RING ABOVE");
+assert.sameValue("\u1E9A".toLocaleUpperCase(), "\u0041\u02BE", "LATIN SMALL LETTER A WITH RIGHT HALF RING");
+
+assert.sameValue("\u1F50".toLocaleUpperCase(), "\u03A5\u0313", "GREEK SMALL LETTER UPSILON WITH PSILI");
+assert.sameValue("\u1F52".toLocaleUpperCase(), "\u03A5\u0313\u0300", "GREEK SMALL LETTER UPSILON WITH PSILI AND VARIA");
+assert.sameValue("\u1F54".toLocaleUpperCase(), "\u03A5\u0313\u0301", "GREEK SMALL LETTER UPSILON WITH PSILI AND OXIA");
+assert.sameValue("\u1F56".toLocaleUpperCase(), "\u03A5\u0313\u0342", "GREEK SMALL LETTER UPSILON WITH PSILI AND PERISPOMENI");
+assert.sameValue("\u1FB6".toLocaleUpperCase(), "\u0391\u0342", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI");
+assert.sameValue("\u1FC6".toLocaleUpperCase(), "\u0397\u0342", "GREEK SMALL LETTER ETA WITH PERISPOMENI");
+assert.sameValue("\u1FD2".toLocaleUpperCase(), "\u0399\u0308\u0300", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FD3".toLocaleUpperCase(), "\u0399\u0308\u0301", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FD6".toLocaleUpperCase(), "\u0399\u0342", "GREEK SMALL LETTER IOTA WITH PERISPOMENI");
+assert.sameValue("\u1FD7".toLocaleUpperCase(), "\u0399\u0308\u0342", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FE2".toLocaleUpperCase(), "\u03A5\u0308\u0300", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FE3".toLocaleUpperCase(), "\u03A5\u0308\u0301", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FE4".toLocaleUpperCase(), "\u03A1\u0313", "GREEK SMALL LETTER RHO WITH PSILI");
+assert.sameValue("\u1FE6".toLocaleUpperCase(), "\u03A5\u0342", "GREEK SMALL LETTER UPSILON WITH PERISPOMENI");
+assert.sameValue("\u1FE7".toLocaleUpperCase(), "\u03A5\u0308\u0342", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FF6".toLocaleUpperCase(), "\u03A9\u0342", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI");
+
+assert.sameValue("\u1F80".toLocaleUpperCase(), "\u1F08\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F81".toLocaleUpperCase(), "\u1F09\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F82".toLocaleUpperCase(), "\u1F0A\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F83".toLocaleUpperCase(), "\u1F0B\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F84".toLocaleUpperCase(), "\u1F0C\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F85".toLocaleUpperCase(), "\u1F0D\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F86".toLocaleUpperCase(), "\u1F0E\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F87".toLocaleUpperCase(), "\u1F0F\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F88".toLocaleUpperCase(), "\u1F08\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F89".toLocaleUpperCase(), "\u1F09\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8A".toLocaleUpperCase(), "\u1F0A\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8B".toLocaleUpperCase(), "\u1F0B\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8C".toLocaleUpperCase(), "\u1F0C\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8D".toLocaleUpperCase(), "\u1F0D\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8E".toLocaleUpperCase(), "\u1F0E\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8F".toLocaleUpperCase(), "\u1F0F\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1F90".toLocaleUpperCase(), "\u1F28\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F91".toLocaleUpperCase(), "\u1F29\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F92".toLocaleUpperCase(), "\u1F2A\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F93".toLocaleUpperCase(), "\u1F2B\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F94".toLocaleUpperCase(), "\u1F2C\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F95".toLocaleUpperCase(), "\u1F2D\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F96".toLocaleUpperCase(), "\u1F2E\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F97".toLocaleUpperCase(), "\u1F2F\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F98".toLocaleUpperCase(), "\u1F28\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F99".toLocaleUpperCase(), "\u1F29\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9A".toLocaleUpperCase(), "\u1F2A\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9B".toLocaleUpperCase(), "\u1F2B\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9C".toLocaleUpperCase(), "\u1F2C\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9D".toLocaleUpperCase(), "\u1F2D\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9E".toLocaleUpperCase(), "\u1F2E\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9F".toLocaleUpperCase(), "\u1F2F\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FA0".toLocaleUpperCase(), "\u1F68\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA1".toLocaleUpperCase(), "\u1F69\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA2".toLocaleUpperCase(), "\u1F6A\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA3".toLocaleUpperCase(), "\u1F6B\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA4".toLocaleUpperCase(), "\u1F6C\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA5".toLocaleUpperCase(), "\u1F6D\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA6".toLocaleUpperCase(), "\u1F6E\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA7".toLocaleUpperCase(), "\u1F6F\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FA8".toLocaleUpperCase(), "\u1F68\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FA9".toLocaleUpperCase(), "\u1F69\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAA".toLocaleUpperCase(), "\u1F6A\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAB".toLocaleUpperCase(), "\u1F6B\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAC".toLocaleUpperCase(), "\u1F6C\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAD".toLocaleUpperCase(), "\u1F6D\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAE".toLocaleUpperCase(), "\u1F6E\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAF".toLocaleUpperCase(), "\u1F6F\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB3".toLocaleUpperCase(), "\u0391\u0399", "GREEK SMALL LETTER ALPHA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FBC".toLocaleUpperCase(), "\u0391\u0399", "GREEK CAPITAL LETTER ALPHA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FC3".toLocaleUpperCase(), "\u0397\u0399", "GREEK SMALL LETTER ETA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FCC".toLocaleUpperCase(), "\u0397\u0399", "GREEK CAPITAL LETTER ETA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FF3".toLocaleUpperCase(), "\u03A9\u0399", "GREEK SMALL LETTER OMEGA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FFC".toLocaleUpperCase(), "\u03A9\u0399", "GREEK CAPITAL LETTER OMEGA WITH PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB2".toLocaleUpperCase(), "\u1FBA\u0399", "GREEK SMALL LETTER ALPHA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FB4".toLocaleUpperCase(), "\u0386\u0399", "GREEK SMALL LETTER ALPHA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC2".toLocaleUpperCase(), "\u1FCA\u0399", "GREEK SMALL LETTER ETA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC4".toLocaleUpperCase(), "\u0389\u0399", "GREEK SMALL LETTER ETA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF2".toLocaleUpperCase(), "\u1FFA\u0399", "GREEK SMALL LETTER OMEGA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF4".toLocaleUpperCase(), "\u038F\u0399", "GREEK SMALL LETTER OMEGA WITH OXIA AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FB7".toLocaleUpperCase(), "\u0391\u0342\u0399", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC7".toLocaleUpperCase(), "\u0397\u0342\u0399", "GREEK SMALL LETTER ETA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF7".toLocaleUpperCase(), "\u03A9\u0342\u0399", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI AND YPOGEGRAMMENI");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/supplementary_plane.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/supplementary_plane.js
new file mode 100644
index 0000000000..1d1b40ff81
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/supplementary_plane.js
@@ -0,0 +1,72 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: String.prototype.toLocaleUpperCase() iterates over code points
+info: |
+    21.1.3.21 String.prototype.toLocaleUpperCase()
+    ...
+    This function interprets a String value as a sequence of UTF-16 encoded
+    code points, as described in 6.1.4.
+
+    This function works exactly the same as toUpperCase [...].
+
+    21.1.3.24 String.prototype.toUpperCase ( )
+
+    This function behaves in exactly the same way as String.prototype.toLowerCase,
+    except that code points are mapped to their uppercase equivalents as specified
+    in the Unicode Character Database.
+
+    21.1.3.22 String.prototype.toLowerCase ( )
+
+    ...
+    4. Let cpList be a List containing in order the code points as defined in
+       6.1.4 of S, starting at the first element of S.
+    5. For each code point c in cpList, if the Unicode Character Database
+       provides a language insensitive lower case equivalent of c then replace
+       c in cpList with that equivalent code point(s).
+es6id: 21.1.3.21
+---*/
+
+assert.sameValue("\uD801\uDC28".toLocaleUpperCase(), "\uD801\uDC00", "DESERET SMALL LETTER LONG I");
+assert.sameValue("\uD801\uDC29".toLocaleUpperCase(), "\uD801\uDC01", "DESERET SMALL LETTER LONG E");
+assert.sameValue("\uD801\uDC2A".toLocaleUpperCase(), "\uD801\uDC02", "DESERET SMALL LETTER LONG A");
+assert.sameValue("\uD801\uDC2B".toLocaleUpperCase(), "\uD801\uDC03", "DESERET SMALL LETTER LONG AH");
+assert.sameValue("\uD801\uDC2C".toLocaleUpperCase(), "\uD801\uDC04", "DESERET SMALL LETTER LONG O");
+assert.sameValue("\uD801\uDC2D".toLocaleUpperCase(), "\uD801\uDC05", "DESERET SMALL LETTER LONG OO");
+assert.sameValue("\uD801\uDC2E".toLocaleUpperCase(), "\uD801\uDC06", "DESERET SMALL LETTER SHORT I");
+assert.sameValue("\uD801\uDC2F".toLocaleUpperCase(), "\uD801\uDC07", "DESERET SMALL LETTER SHORT E");
+assert.sameValue("\uD801\uDC30".toLocaleUpperCase(), "\uD801\uDC08", "DESERET SMALL LETTER SHORT A");
+assert.sameValue("\uD801\uDC31".toLocaleUpperCase(), "\uD801\uDC09", "DESERET SMALL LETTER SHORT AH");
+assert.sameValue("\uD801\uDC32".toLocaleUpperCase(), "\uD801\uDC0A", "DESERET SMALL LETTER SHORT O");
+assert.sameValue("\uD801\uDC33".toLocaleUpperCase(), "\uD801\uDC0B", "DESERET SMALL LETTER SHORT OO");
+assert.sameValue("\uD801\uDC34".toLocaleUpperCase(), "\uD801\uDC0C", "DESERET SMALL LETTER AY");
+assert.sameValue("\uD801\uDC35".toLocaleUpperCase(), "\uD801\uDC0D", "DESERET SMALL LETTER OW");
+assert.sameValue("\uD801\uDC36".toLocaleUpperCase(), "\uD801\uDC0E", "DESERET SMALL LETTER WU");
+assert.sameValue("\uD801\uDC37".toLocaleUpperCase(), "\uD801\uDC0F", "DESERET SMALL LETTER YEE");
+assert.sameValue("\uD801\uDC38".toLocaleUpperCase(), "\uD801\uDC10", "DESERET SMALL LETTER H");
+assert.sameValue("\uD801\uDC39".toLocaleUpperCase(), "\uD801\uDC11", "DESERET SMALL LETTER PEE");
+assert.sameValue("\uD801\uDC3A".toLocaleUpperCase(), "\uD801\uDC12", "DESERET SMALL LETTER BEE");
+assert.sameValue("\uD801\uDC3B".toLocaleUpperCase(), "\uD801\uDC13", "DESERET SMALL LETTER TEE");
+assert.sameValue("\uD801\uDC3C".toLocaleUpperCase(), "\uD801\uDC14", "DESERET SMALL LETTER DEE");
+assert.sameValue("\uD801\uDC3D".toLocaleUpperCase(), "\uD801\uDC15", "DESERET SMALL LETTER CHEE");
+assert.sameValue("\uD801\uDC3E".toLocaleUpperCase(), "\uD801\uDC16", "DESERET SMALL LETTER JEE");
+assert.sameValue("\uD801\uDC3F".toLocaleUpperCase(), "\uD801\uDC17", "DESERET SMALL LETTER KAY");
+assert.sameValue("\uD801\uDC40".toLocaleUpperCase(), "\uD801\uDC18", "DESERET SMALL LETTER GAY");
+assert.sameValue("\uD801\uDC41".toLocaleUpperCase(), "\uD801\uDC19", "DESERET SMALL LETTER EF");
+assert.sameValue("\uD801\uDC42".toLocaleUpperCase(), "\uD801\uDC1A", "DESERET SMALL LETTER VEE");
+assert.sameValue("\uD801\uDC43".toLocaleUpperCase(), "\uD801\uDC1B", "DESERET SMALL LETTER ETH");
+assert.sameValue("\uD801\uDC44".toLocaleUpperCase(), "\uD801\uDC1C", "DESERET SMALL LETTER THEE");
+assert.sameValue("\uD801\uDC45".toLocaleUpperCase(), "\uD801\uDC1D", "DESERET SMALL LETTER ES");
+assert.sameValue("\uD801\uDC46".toLocaleUpperCase(), "\uD801\uDC1E", "DESERET SMALL LETTER ZEE");
+assert.sameValue("\uD801\uDC47".toLocaleUpperCase(), "\uD801\uDC1F", "DESERET SMALL LETTER ESH");
+assert.sameValue("\uD801\uDC48".toLocaleUpperCase(), "\uD801\uDC20", "DESERET SMALL LETTER ZHEE");
+assert.sameValue("\uD801\uDC49".toLocaleUpperCase(), "\uD801\uDC21", "DESERET SMALL LETTER ER");
+assert.sameValue("\uD801\uDC4A".toLocaleUpperCase(), "\uD801\uDC22", "DESERET SMALL LETTER EL");
+assert.sameValue("\uD801\uDC4B".toLocaleUpperCase(), "\uD801\uDC23", "DESERET SMALL LETTER EM");
+assert.sameValue("\uD801\uDC4C".toLocaleUpperCase(), "\uD801\uDC24", "DESERET SMALL LETTER EN");
+assert.sameValue("\uD801\uDC4D".toLocaleUpperCase(), "\uD801\uDC25", "DESERET SMALL LETTER ENG");
+assert.sameValue("\uD801\uDC4E".toLocaleUpperCase(), "\uD801\uDC26", "DESERET SMALL LETTER OI");
+assert.sameValue("\uD801\uDC4F".toLocaleUpperCase(), "\uD801\uDC27", "DESERET SMALL LETTER EW");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..f3e2977792
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLocaleUpperCase/this-value-not-obj-coercible.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.tolocaleuppercase
+description: The "this" value must be object-coercible
+info: |
+  This function works exactly the same as toUpperCase except that its result is
+  intended to yield the correct result for the host environment's current
+  locale, rather than a locale-independent result.
+
+  21.1.3.26 String.prototype.toUpperCase
+
+  This function behaves in exactly the same way as
+  String.prototype.toLowerCase, except that code points are mapped to their
+  uppercase equivalents as specified in the Unicode Character Database.
+
+  21.1.3.24 String.prototype.toLowerCase
+
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var toLocaleUpperCase = String.prototype.toLocaleUpperCase;
+
+assert.sameValue(typeof toLocaleUpperCase, 'function');
+
+assert.throws(TypeError, function() {
+  toLocaleUpperCase.call(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  toLocaleUpperCase.call(null);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/Final_Sigma_U180E.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/Final_Sigma_U180E.js
new file mode 100644
index 0000000000..961b6abf84
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/Final_Sigma_U180E.js
@@ -0,0 +1,62 @@
+// Copyright (C) 2016 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tolowercase
+description: >
+    Check if String.prototype.toLowerCase supports conditional mappings defined in SpecialCasings,
+    test Final_Sigma context with Mongolian Vowel Separator
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+features: [u180e]
+---*/
+
+// SpecialCasing.txt, conditional, language-insensitive mappings.
+
+// <code>; <lower>; <title>; <upper>; (<condition_list>;)? # <comment>
+// 03A3; 03C2; 03A3; 03A3; Final_Sigma; # GREEK CAPITAL LETTER SIGMA
+// 03A3; 03C3; 03A3; 03A3; # GREEK CAPITAL LETTER SIGMA
+
+// Final_Sigma is defined in Unicode 8.0, 3.13 Default Case Algorithms
+// General_Category of Mongolian Vowel Separator is Cf (Format), characters in Cf are Case_Ignorable.
+
+
+// Sigma preceded by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u180E\u03A3".toLowerCase(),
+  "a\u180E\u03C2",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u180E\u03A3B".toLowerCase(),
+  "a\u180E\u03C3b",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by LATIN CAPITAL LETTER B"
+);
+
+// Sigma followed by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u03A3\u180E".toLowerCase(),
+  "a\u03C2\u180E",
+  "Sigma preceded by LATIN CAPITAL LETTER A, followed by MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u03A3\u180EB".toLowerCase(),
+  "a\u03C3\u180Eb",
+  "Sigma preceded by LATIN CAPITAL LETTER A, followed by MONGOLIAN VOWEL SEPARATOR, LATIN CAPITAL LETTER B"
+);
+
+// Sigma preceded and followed by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u180E\u03A3\u180E".toLowerCase(),
+  "a\u180E\u03C2\u180E",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u180E\u03A3\u180EB".toLowerCase(),
+  "a\u180E\u03C3\u180Eb",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by MONGOLIAN VOWEL SEPARATOR, LATIN CAPITAL LETTER B"
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A10.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A10.js
new file mode 100644
index 0000000000..6fab668dcf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A10.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLowerCase.length property has the attribute
+    ReadOnly
+es5id: 15.5.4.16_A10
+description: >
+    Checking if varying the String.prototype.toLowerCase.length
+    property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toLowerCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.toLowerCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.toLowerCase.length;
+
+verifyNotWritable(String.prototype.toLowerCase, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLowerCase.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.toLowerCase.length; String.prototype.toLowerCase.length = function(){return "shifted";}; String.prototype.toLowerCase.length === __obj. Actual: ' + String.prototype.toLowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A11.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A11.js
new file mode 100644
index 0000000000..04cde91c2f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the toLowerCase method is 0
+es5id: 15.5.4.16_A11
+description: Checking String.prototype.toLowerCase.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toLowerCase.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.toLowerCase.hasOwnProperty("length") return true. Actual: ' + String.prototype.toLowerCase.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLowerCase.length !== 0) {
+  throw new Test262Error('#2: String.prototype.toLowerCase.length === 0. Actual: ' + String.prototype.toLowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T1.js
new file mode 100644
index 0000000000..2d6b0f4315
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T1
+description: Arguments is true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toLowerCase() !== "true") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.toLowerCase = String.prototype.toLowerCase;  __instance.toLowerCase() === "true". Actual: ' + __instance.toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T10.js
new file mode 100644
index 0000000000..1139c29567
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T10.js
@@ -0,0 +1,28 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T10
+description: >
+    Call toLowerCase() function of object with overrode toString
+    function
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041B";
+  }
+}
+__obj.toLowerCase = String.prototype.toLowerCase;
+
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toLowerCase() !== "ab") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return "\u0041B";}}; __obj.toLowerCase = String.prototype.toLowerCase; __obj.toLowerCase() ==="ab". Actual: ' + __obj.toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T11.js
new file mode 100644
index 0000000000..e39bfca7df
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T11.js
@@ -0,0 +1,32 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T11
+description: >
+    Override toString function, toString throw exception, then call
+    toLowerCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+}
+__obj.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toLowerCase();
+  throw new Test262Error('#1: "var x = __obj.toLowerCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T12.js
new file mode 100644
index 0000000000..355844e014
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T12.js
@@ -0,0 +1,35 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T12
+description: >
+    Override toString and valueOf functions, valueOf throw exception,
+    then call toLowerCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+}
+__obj.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toLowerCase();
+  throw new Test262Error('#1: "var x = __obj.toLowerCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T13.js
new file mode 100644
index 0000000000..950d1d1875
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T13.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T13
+description: >
+    Override toString and valueOf functions, then call toLowerCase()
+    function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return 1;
+  }
+}
+__obj.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toLowerCase() !== "1") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toLowerCase = String.prototype.toLowerCase; __obj.toLowerCase() ==="1". Actual: ' + __obj.toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__obj.toLowerCase().length !== 1) {
+  throw new Test262Error('#2: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toLowerCase = String.prototype.toLowerCase; __obj.toLowerCase().length === 1. Actual: ' + __obj.toLowerCase().length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T14.js
new file mode 100644
index 0000000000..d981fff7fd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T14.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T14
+description: Call toLowerCase() function for RegExp object
+---*/
+
+var __reg = new RegExp("ABC");
+__reg.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__reg.toLowerCase() !== "/abc/") {
+  throw new Test262Error('#1: var __reg = new RegExp("ABC"); __reg.toLowerCase = String.prototype.toLowerCase; __reg.toLowerCase() === "/abc/". Actual: ' + __reg.toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T2.js
new file mode 100644
index 0000000000..8167201dec
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T2.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T2
+description: Instance is Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toLowerCase() !== "false") {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.toLowerCase = String.prototype.toLowerCase;  __instance.toLowerCase() === "false". Actual: ' + __instance.toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T3.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T3.js
new file mode 100644
index 0000000000..b3c7a58a65
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T3.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T3
+description: Checking by using eval
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (eval("\"BJ\"").toLowerCase() !== "bj") {
+  throw new Test262Error('#1: eval("\\"BJ\\"").toLowerCase() === "bj". Actual: ' + eval("\"BJ\"").toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T4.js
new file mode 100644
index 0000000000..339dec7f60
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T4.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T4
+description: >
+    Call toLowerCase() function without arguments of string and from
+    empty string
+---*/
+
+var __lowerCase = "".toLowerCase();
+
+var __expected = "";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__lowerCase.length !== __expected.length) {
+  throw new Test262Error('#1: __lowerCase = "".toLowerCase(); __expected = ""; __lowerCase.length === __expected.length. Actual: ' + __lowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__lowerCase.index !== __expected.index) {
+  throw new Test262Error('#2: __lowerCase = "".toLowerCase(); __expected = ""; __lowerCase.index === __expected.index. Actual: ' + __lowerCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__lowerCase.input !== __expected.input) {
+  throw new Test262Error('#3: __lowerCase = "".toLowerCase(); __expected = ""; __lowerCase.input === __expected.input. Actual: ' + __lowerCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__lowerCase[0] !== __expected[0]) {
+  throw new Test262Error('#4: __lowerCase = "".toLowerCase(); __expected = ""; __lowerCase[0]===' + __expected[0] + '. Actual: ' + __lowerCase[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T5.js
new file mode 100644
index 0000000000..66c5e84851
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T5
+description: Call toLowerCase() function for function call
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" match(null) evaluates to match("null")
+if (function() {
+    return "GnulLuNa"
+  }().toLowerCase() !== "gnulluna") {
+  throw new Test262Error('#1: function(){return "GnulLuNa"}().toLowerCase() === "gnulluna". Actual: ' + function() {
+    return "GnulLuNa"
+  }().toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T6.js
new file mode 100644
index 0000000000..0447844c40
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T6.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T6
+description: Call toLowerCase() function of Number.NEGATIVE_INFINITY
+---*/
+
+Number.prototype.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ((Number.NEGATIVE_INFINITY).toLowerCase() !== "-infinity") {
+  throw new Test262Error('#1: Number.prototype.toLowerCase = String.prototype.toLowerCase; (Number.NEGATIVE_INFINITY).toLowerCase() === "-infinity". Actual: ' + (Number.NEGATIVE_INFINITY).toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T7.js
new file mode 100644
index 0000000000..239740c605
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T7
+description: Call toLowerCase() function of NaN
+---*/
+
+Number.prototype.toLowerCase = String.prototype.toLowerCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (NaN.toLowerCase() !== "nan") {
+  throw new Test262Error('#1: Number.prototype.toLowerCase = String.prototype.toLowerCase; NaN.toLowerCase()=== "nan". Actual: ' + NaN.toLowerCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T8.js
new file mode 100644
index 0000000000..7ab6dfe263
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T8.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T8
+description: Call toLowerCase() function of Infinity
+---*/
+
+Number.prototype.toLowerCase = String.prototype.toLowerCase;
+
+if (Infinity.toLowerCase() !== "infinity") {
+  throw new Test262Error('#1: Number.prototype.toLowerCase = String.prototype.toLowerCase; Infinity.toLowerCase()=== "infinity". Actual: ' + Infinity.toLowerCase());
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T9.js
new file mode 100644
index 0000000000..088479f931
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A1_T9.js
@@ -0,0 +1,53 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase()
+es5id: 15.5.4.16_A1_T9
+description: Call toLowerCase() function of string object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+var __lowerCase = new String(__obj).toLowerCase();
+
+var __expected = "undefined";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__lowerCase.length !== __expected.length) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLowerCase(); __expected ="undefined"; __lowerCase.length === __expected.length. Actual: ' + __lowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__lowerCase.index !== __expected.index) {
+  throw new Test262Error('#2: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLowerCase(); __expected ="undefined"; __lowerCase.index === __expected.index. Actual: ' + __lowerCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__lowerCase.input !== __expected.input) {
+  throw new Test262Error('#3: __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLowerCase(); __expected ="undefined"; __lowerCase.input === __expected.input. Actual: ' + __lowerCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__lowerCase[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __obj = {valueOf:function(){}, toString:void 0}; __lowerCase = new String(__obj).toLowerCase(); __expected ="undefined"; __lowerCase[' + index + ']===' + __expected[index] + '. Actual: ' + __lowerCase[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A2_T1.js
new file mode 100644
index 0000000000..3985b12c0d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A2_T1.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase() return a string, but not a String object
+es5id: 15.5.4.16_A2_T1
+description: Checking returned result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("Hello, WoRlD!".toLowerCase() !== "hello, world!") {
+  throw new Test262Error('#1: "Hello, WoRlD!".toLowerCase() === "hello, world!". Actual: ' + ("Hello, WoRlD!".toLowerCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if ("Hello, WoRlD!".toLowerCase() !== String("hello, world!")) {
+  throw new Test262Error('#2: "Hello, WoRlD!".toLowerCase() === String("hello, world!"). Actual: ' + ("Hello, WoRlD!".toLowerCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if ("Hello, WoRlD!".toLowerCase() === new String("hello, world!")) {
+  throw new Test262Error('#3: "Hello, WoRlD!".toLowerCase() !== new String("hello, world!")');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A6.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A6.js
new file mode 100644
index 0000000000..00240423bf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase has not prototype property
+es5id: 15.5.4.16_A6
+description: Checking String.prototype.toLowerCase.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.toLowerCase.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.toLowerCase.prototype === undefined. Actual: ' + String.prototype.toLowerCase.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A7.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A7.js
new file mode 100644
index 0000000000..398c46d58c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toLowerCase can't be used as constructor
+es5id: 15.5.4.16_A7
+description: Checking if creating the String.prototype.toLowerCase object fails
+---*/
+
+var __FACTORY = String.prototype.toLowerCase;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: var __FACTORY = String.prototype.toLowerCase; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.1: var __FACTORY = String.prototype.toLowerCase; "__instance = new __FACTORY" throws a TypeError. Actual: ' + (e));
+  }
+};
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A8.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A8.js
new file mode 100644
index 0000000000..2de059b88b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A8.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLowerCase.length property has the attribute
+    DontEnum
+es5id: 15.5.4.16_A8
+description: >
+    Checking if enumerating the String.prototype.toLowerCase.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toLowerCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toLowerCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.toLowerCase.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.toLowerCase.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.toLowerCase) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.toLowerCase){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A9.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A9.js
new file mode 100644
index 0000000000..ef8e3382e0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/S15.5.4.16_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toLowerCase.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.16_A9
+description: >
+    Checking if deleting the String.prototype.toLowerCase.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toLowerCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toLowerCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.toLowerCase.length) {
+  throw new Test262Error('#1: delete String.prototype.toLowerCase.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toLowerCase.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.toLowerCase.length; String.prototype.toLowerCase.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.toLowerCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/browser.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/name.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/name.js
new file mode 100644
index 0000000000..48f9222ed5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.22
+description: >
+  String.prototype.toLowerCase.name is "toLowerCase".
+info: |
+  String.prototype.toLowerCase ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.toLowerCase.name, "toLowerCase");
+
+verifyNotEnumerable(String.prototype.toLowerCase, "name");
+verifyNotWritable(String.prototype.toLowerCase, "name");
+verifyConfigurable(String.prototype.toLowerCase, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/not-a-constructor.js
new file mode 100644
index 0000000000..e9d92daf54
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.toLowerCase does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.toLowerCase),
+  false,
+  'isConstructor(String.prototype.toLowerCase) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.toLowerCase();
+}, '`new String.prototype.toLowerCase()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/shell.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/special_casing.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/special_casing.js
new file mode 100644
index 0000000000..7d0cf1ff16
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/special_casing.js
@@ -0,0 +1,137 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Check if String.prototype.toLowerCase supports mappings defined in SpecialCasings
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+es5id: 15.5.4.16
+es6id: 21.1.3.22
+---*/
+
+// SpecialCasing.txt, except for conditional mappings.
+
+assert.sameValue("\u00DF".toLowerCase(), "\u00DF", "LATIN SMALL LETTER SHARP S");
+
+assert.sameValue("\u0130".toLowerCase(), "\u0069\u0307", "LATIN CAPITAL LETTER I WITH DOT ABOVE");
+
+assert.sameValue("\uFB00".toLowerCase(), "\uFB00", "LATIN SMALL LIGATURE FF");
+assert.sameValue("\uFB01".toLowerCase(), "\uFB01", "LATIN SMALL LIGATURE FI");
+assert.sameValue("\uFB02".toLowerCase(), "\uFB02", "LATIN SMALL LIGATURE FL");
+assert.sameValue("\uFB03".toLowerCase(), "\uFB03", "LATIN SMALL LIGATURE FFI");
+assert.sameValue("\uFB04".toLowerCase(), "\uFB04", "LATIN SMALL LIGATURE FFL");
+assert.sameValue("\uFB05".toLowerCase(), "\uFB05", "LATIN SMALL LIGATURE LONG S T");
+assert.sameValue("\uFB06".toLowerCase(), "\uFB06", "LATIN SMALL LIGATURE ST");
+
+assert.sameValue("\u0587".toLowerCase(), "\u0587", "ARMENIAN SMALL LIGATURE ECH YIWN");
+assert.sameValue("\uFB13".toLowerCase(), "\uFB13", "ARMENIAN SMALL LIGATURE MEN NOW");
+assert.sameValue("\uFB14".toLowerCase(), "\uFB14", "ARMENIAN SMALL LIGATURE MEN ECH");
+assert.sameValue("\uFB15".toLowerCase(), "\uFB15", "ARMENIAN SMALL LIGATURE MEN INI");
+assert.sameValue("\uFB16".toLowerCase(), "\uFB16", "ARMENIAN SMALL LIGATURE VEW NOW");
+assert.sameValue("\uFB17".toLowerCase(), "\uFB17", "ARMENIAN SMALL LIGATURE MEN XEH");
+
+assert.sameValue("\u0149".toLowerCase(), "\u0149", "LATIN SMALL LETTER N PRECEDED BY APOSTROPHE");
+
+assert.sameValue("\u0390".toLowerCase(), "\u0390", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS");
+assert.sameValue("\u03B0".toLowerCase(), "\u03B0", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS");
+
+assert.sameValue("\u01F0".toLowerCase(), "\u01F0", "LATIN SMALL LETTER J WITH CARON");
+assert.sameValue("\u1E96".toLowerCase(), "\u1E96", "LATIN SMALL LETTER H WITH LINE BELOW");
+assert.sameValue("\u1E97".toLowerCase(), "\u1E97", "LATIN SMALL LETTER T WITH DIAERESIS");
+assert.sameValue("\u1E98".toLowerCase(), "\u1E98", "LATIN SMALL LETTER W WITH RING ABOVE");
+assert.sameValue("\u1E99".toLowerCase(), "\u1E99", "LATIN SMALL LETTER Y WITH RING ABOVE");
+assert.sameValue("\u1E9A".toLowerCase(), "\u1E9A", "LATIN SMALL LETTER A WITH RIGHT HALF RING");
+
+assert.sameValue("\u1F50".toLowerCase(), "\u1F50", "GREEK SMALL LETTER UPSILON WITH PSILI");
+assert.sameValue("\u1F52".toLowerCase(), "\u1F52", "GREEK SMALL LETTER UPSILON WITH PSILI AND VARIA");
+assert.sameValue("\u1F54".toLowerCase(), "\u1F54", "GREEK SMALL LETTER UPSILON WITH PSILI AND OXIA");
+assert.sameValue("\u1F56".toLowerCase(), "\u1F56", "GREEK SMALL LETTER UPSILON WITH PSILI AND PERISPOMENI");
+assert.sameValue("\u1FB6".toLowerCase(), "\u1FB6", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI");
+assert.sameValue("\u1FC6".toLowerCase(), "\u1FC6", "GREEK SMALL LETTER ETA WITH PERISPOMENI");
+assert.sameValue("\u1FD2".toLowerCase(), "\u1FD2", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FD3".toLowerCase(), "\u1FD3", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FD6".toLowerCase(), "\u1FD6", "GREEK SMALL LETTER IOTA WITH PERISPOMENI");
+assert.sameValue("\u1FD7".toLowerCase(), "\u1FD7", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FE2".toLowerCase(), "\u1FE2", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FE3".toLowerCase(), "\u1FE3", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FE4".toLowerCase(), "\u1FE4", "GREEK SMALL LETTER RHO WITH PSILI");
+assert.sameValue("\u1FE6".toLowerCase(), "\u1FE6", "GREEK SMALL LETTER UPSILON WITH PERISPOMENI");
+assert.sameValue("\u1FE7".toLowerCase(), "\u1FE7", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FF6".toLowerCase(), "\u1FF6", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI");
+
+assert.sameValue("\u1F80".toLowerCase(), "\u1F80", "GREEK SMALL LETTER ALPHA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F81".toLowerCase(), "\u1F81", "GREEK SMALL LETTER ALPHA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F82".toLowerCase(), "\u1F82", "GREEK SMALL LETTER ALPHA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F83".toLowerCase(), "\u1F83", "GREEK SMALL LETTER ALPHA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F84".toLowerCase(), "\u1F84", "GREEK SMALL LETTER ALPHA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F85".toLowerCase(), "\u1F85", "GREEK SMALL LETTER ALPHA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F86".toLowerCase(), "\u1F86", "GREEK SMALL LETTER ALPHA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F87".toLowerCase(), "\u1F87", "GREEK SMALL LETTER ALPHA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F88".toLowerCase(), "\u1F80", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F89".toLowerCase(), "\u1F81", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8A".toLowerCase(), "\u1F82", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8B".toLowerCase(), "\u1F83", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8C".toLowerCase(), "\u1F84", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8D".toLowerCase(), "\u1F85", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8E".toLowerCase(), "\u1F86", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8F".toLowerCase(), "\u1F87", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1F90".toLowerCase(), "\u1F90", "GREEK SMALL LETTER ETA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F91".toLowerCase(), "\u1F91", "GREEK SMALL LETTER ETA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F92".toLowerCase(), "\u1F92", "GREEK SMALL LETTER ETA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F93".toLowerCase(), "\u1F93", "GREEK SMALL LETTER ETA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F94".toLowerCase(), "\u1F94", "GREEK SMALL LETTER ETA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F95".toLowerCase(), "\u1F95", "GREEK SMALL LETTER ETA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F96".toLowerCase(), "\u1F96", "GREEK SMALL LETTER ETA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F97".toLowerCase(), "\u1F97", "GREEK SMALL LETTER ETA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F98".toLowerCase(), "\u1F90", "GREEK CAPITAL LETTER ETA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F99".toLowerCase(), "\u1F91", "GREEK CAPITAL LETTER ETA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9A".toLowerCase(), "\u1F92", "GREEK CAPITAL LETTER ETA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9B".toLowerCase(), "\u1F93", "GREEK CAPITAL LETTER ETA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9C".toLowerCase(), "\u1F94", "GREEK CAPITAL LETTER ETA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9D".toLowerCase(), "\u1F95", "GREEK CAPITAL LETTER ETA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9E".toLowerCase(), "\u1F96", "GREEK CAPITAL LETTER ETA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9F".toLowerCase(), "\u1F97", "GREEK CAPITAL LETTER ETA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FA0".toLowerCase(), "\u1FA0", "GREEK SMALL LETTER OMEGA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA1".toLowerCase(), "\u1FA1", "GREEK SMALL LETTER OMEGA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA2".toLowerCase(), "\u1FA2", "GREEK SMALL LETTER OMEGA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA3".toLowerCase(), "\u1FA3", "GREEK SMALL LETTER OMEGA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA4".toLowerCase(), "\u1FA4", "GREEK SMALL LETTER OMEGA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA5".toLowerCase(), "\u1FA5", "GREEK SMALL LETTER OMEGA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA6".toLowerCase(), "\u1FA6", "GREEK SMALL LETTER OMEGA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA7".toLowerCase(), "\u1FA7", "GREEK SMALL LETTER OMEGA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FA8".toLowerCase(), "\u1FA0", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FA9".toLowerCase(), "\u1FA1", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAA".toLowerCase(), "\u1FA2", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAB".toLowerCase(), "\u1FA3", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAC".toLowerCase(), "\u1FA4", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAD".toLowerCase(), "\u1FA5", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAE".toLowerCase(), "\u1FA6", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAF".toLowerCase(), "\u1FA7", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB3".toLowerCase(), "\u1FB3", "GREEK SMALL LETTER ALPHA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FBC".toLowerCase(), "\u1FB3", "GREEK CAPITAL LETTER ALPHA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FC3".toLowerCase(), "\u1FC3", "GREEK SMALL LETTER ETA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FCC".toLowerCase(), "\u1FC3", "GREEK CAPITAL LETTER ETA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FF3".toLowerCase(), "\u1FF3", "GREEK SMALL LETTER OMEGA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FFC".toLowerCase(), "\u1FF3", "GREEK CAPITAL LETTER OMEGA WITH PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB2".toLowerCase(), "\u1FB2", "GREEK SMALL LETTER ALPHA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FB4".toLowerCase(), "\u1FB4", "GREEK SMALL LETTER ALPHA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC2".toLowerCase(), "\u1FC2", "GREEK SMALL LETTER ETA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC4".toLowerCase(), "\u1FC4", "GREEK SMALL LETTER ETA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF2".toLowerCase(), "\u1FF2", "GREEK SMALL LETTER OMEGA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF4".toLowerCase(), "\u1FF4", "GREEK SMALL LETTER OMEGA WITH OXIA AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FB7".toLowerCase(), "\u1FB7", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC7".toLowerCase(), "\u1FC7", "GREEK SMALL LETTER ETA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF7".toLowerCase(), "\u1FF7", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI AND YPOGEGRAMMENI");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/special_casing_conditional.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/special_casing_conditional.js
new file mode 100644
index 0000000000..8356bbe54e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/special_casing_conditional.js
@@ -0,0 +1,103 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Check if String.prototype.toLowerCase supports conditional mappings defined in SpecialCasings
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+es5id: 15.5.4.16
+es6id: 21.1.3.22
+---*/
+
+// SpecialCasing.txt, conditional, language-insensitive mappings.
+
+// <code>; <lower>; <title>; <upper>; (<condition_list>;)? # <comment>
+// 03A3; 03C2; 03A3; 03A3; Final_Sigma; # GREEK CAPITAL LETTER SIGMA
+// 03A3; 03C3; 03A3; 03A3; # GREEK CAPITAL LETTER SIGMA
+
+// Final_Sigma is defined in Unicode 5.1, 3.13 Default Case Algorithms.
+
+assert.sameValue(
+  "\u03A3".toLowerCase(),
+  "\u03C3",
+  "Single GREEK CAPITAL LETTER SIGMA"
+);
+
+// Sigma preceded by Cased and zero or more Case_Ignorable.
+assert.sameValue(
+  "A\u03A3".toLowerCase(),
+  "a\u03C2",
+  "Sigma preceded by LATIN CAPITAL LETTER A"
+);
+assert.sameValue(
+  "\uD835\uDCA2\u03A3".toLowerCase(),
+  "\uD835\uDCA2\u03C2",
+  "Sigma preceded by MATHEMATICAL SCRIPT CAPITAL G (D835 DCA2 = 1D4A2)"
+);
+assert.sameValue(
+  "A.\u03A3".toLowerCase(),
+  "a.\u03C2",
+  "Sigma preceded by FULL STOP"
+);
+assert.sameValue(
+  "A\u00AD\u03A3".toLowerCase(),
+  "a\u00AD\u03C2",
+  "Sigma preceded by SOFT HYPHEN (00AD)"
+);
+assert.sameValue(
+  "A\uD834\uDE42\u03A3".toLowerCase(),
+  "a\uD834\uDE42\u03C2",
+  "Sigma preceded by COMBINING GREEK MUSICAL TRISEME (D834 DE42 = 1D242)"
+);
+assert.sameValue(
+  "\u0345\u03A3".toLowerCase(),
+  "\u0345\u03C3",
+  "Sigma preceded by COMBINING GREEK YPOGEGRAMMENI (0345)"
+);
+assert.sameValue(
+  "\u0391\u0345\u03A3".toLowerCase(),
+  "\u03B1\u0345\u03C2",
+  "Sigma preceded by GREEK CAPITAL LETTER ALPHA (0391), COMBINING GREEK YPOGEGRAMMENI (0345)"
+);
+
+// Sigma not followed by zero or more Case_Ignorable and then Cased.
+assert.sameValue(
+  "A\u03A3B".toLowerCase(),
+  "a\u03C3b",
+  "Sigma followed by LATIN CAPITAL LETTER B"
+);
+assert.sameValue(
+  "A\u03A3\uD835\uDCA2".toLowerCase(),
+  "a\u03C3\uD835\uDCA2",
+  "Sigma followed by MATHEMATICAL SCRIPT CAPITAL G (D835 DCA2 = 1D4A2)"
+);
+assert.sameValue(
+  "A\u03A3.b".toLowerCase(),
+  "a\u03C3.b",
+  "Sigma followed by FULL STOP"
+);
+assert.sameValue(
+  "A\u03A3\u00ADB".toLowerCase(),
+  "a\u03C3\u00ADb",
+  "Sigma followed by SOFT HYPHEN (00AD)"
+);
+assert.sameValue(
+  "A\u03A3\uD834\uDE42B".toLowerCase(),
+  "a\u03C3\uD834\uDE42b",
+  "Sigma followed by COMBINING GREEK MUSICAL TRISEME (D834 DE42 = 1D242)"
+);
+assert.sameValue(
+  "A\u03A3\u0345".toLowerCase(),
+  "a\u03C2\u0345",
+  "Sigma followed by COMBINING GREEK YPOGEGRAMMENI (0345)"
+);
+assert.sameValue(
+  "A\u03A3\u0345\u0391".toLowerCase(),
+  "a\u03C3\u0345\u03B1",
+  "Sigma followed by COMBINING GREEK YPOGEGRAMMENI (0345), GREEK CAPITAL LETTER ALPHA (0391)"
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/supplementary_plane.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/supplementary_plane.js
new file mode 100644
index 0000000000..f1d7ece31f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/supplementary_plane.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: String.prototype.toLowerCase() iterates over code points
+info: |
+    21.1.3.22 String.prototype.toLowerCase ( )
+
+    ...
+    4. Let cpList be a List containing in order the code points as defined in
+       6.1.4 of S, starting at the first element of S.
+    5. For each code point c in cpList, if the Unicode Character Database
+       provides a language insensitive lower case equivalent of c then replace
+       c in cpList with that equivalent code point(s).
+es6id: 21.1.3.22
+---*/
+
+assert.sameValue("\uD801\uDC00".toLowerCase(), "\uD801\uDC28", "DESERET CAPITAL LETTER LONG I");
+assert.sameValue("\uD801\uDC01".toLowerCase(), "\uD801\uDC29", "DESERET CAPITAL LETTER LONG E");
+assert.sameValue("\uD801\uDC02".toLowerCase(), "\uD801\uDC2A", "DESERET CAPITAL LETTER LONG A");
+assert.sameValue("\uD801\uDC03".toLowerCase(), "\uD801\uDC2B", "DESERET CAPITAL LETTER LONG AH");
+assert.sameValue("\uD801\uDC04".toLowerCase(), "\uD801\uDC2C", "DESERET CAPITAL LETTER LONG O");
+assert.sameValue("\uD801\uDC05".toLowerCase(), "\uD801\uDC2D", "DESERET CAPITAL LETTER LONG OO");
+assert.sameValue("\uD801\uDC06".toLowerCase(), "\uD801\uDC2E", "DESERET CAPITAL LETTER SHORT I");
+assert.sameValue("\uD801\uDC07".toLowerCase(), "\uD801\uDC2F", "DESERET CAPITAL LETTER SHORT E");
+assert.sameValue("\uD801\uDC08".toLowerCase(), "\uD801\uDC30", "DESERET CAPITAL LETTER SHORT A");
+assert.sameValue("\uD801\uDC09".toLowerCase(), "\uD801\uDC31", "DESERET CAPITAL LETTER SHORT AH");
+assert.sameValue("\uD801\uDC0A".toLowerCase(), "\uD801\uDC32", "DESERET CAPITAL LETTER SHORT O");
+assert.sameValue("\uD801\uDC0B".toLowerCase(), "\uD801\uDC33", "DESERET CAPITAL LETTER SHORT OO");
+assert.sameValue("\uD801\uDC0C".toLowerCase(), "\uD801\uDC34", "DESERET CAPITAL LETTER AY");
+assert.sameValue("\uD801\uDC0D".toLowerCase(), "\uD801\uDC35", "DESERET CAPITAL LETTER OW");
+assert.sameValue("\uD801\uDC0E".toLowerCase(), "\uD801\uDC36", "DESERET CAPITAL LETTER WU");
+assert.sameValue("\uD801\uDC0F".toLowerCase(), "\uD801\uDC37", "DESERET CAPITAL LETTER YEE");
+assert.sameValue("\uD801\uDC10".toLowerCase(), "\uD801\uDC38", "DESERET CAPITAL LETTER H");
+assert.sameValue("\uD801\uDC11".toLowerCase(), "\uD801\uDC39", "DESERET CAPITAL LETTER PEE");
+assert.sameValue("\uD801\uDC12".toLowerCase(), "\uD801\uDC3A", "DESERET CAPITAL LETTER BEE");
+assert.sameValue("\uD801\uDC13".toLowerCase(), "\uD801\uDC3B", "DESERET CAPITAL LETTER TEE");
+assert.sameValue("\uD801\uDC14".toLowerCase(), "\uD801\uDC3C", "DESERET CAPITAL LETTER DEE");
+assert.sameValue("\uD801\uDC15".toLowerCase(), "\uD801\uDC3D", "DESERET CAPITAL LETTER CHEE");
+assert.sameValue("\uD801\uDC16".toLowerCase(), "\uD801\uDC3E", "DESERET CAPITAL LETTER JEE");
+assert.sameValue("\uD801\uDC17".toLowerCase(), "\uD801\uDC3F", "DESERET CAPITAL LETTER KAY");
+assert.sameValue("\uD801\uDC18".toLowerCase(), "\uD801\uDC40", "DESERET CAPITAL LETTER GAY");
+assert.sameValue("\uD801\uDC19".toLowerCase(), "\uD801\uDC41", "DESERET CAPITAL LETTER EF");
+assert.sameValue("\uD801\uDC1A".toLowerCase(), "\uD801\uDC42", "DESERET CAPITAL LETTER VEE");
+assert.sameValue("\uD801\uDC1B".toLowerCase(), "\uD801\uDC43", "DESERET CAPITAL LETTER ETH");
+assert.sameValue("\uD801\uDC1C".toLowerCase(), "\uD801\uDC44", "DESERET CAPITAL LETTER THEE");
+assert.sameValue("\uD801\uDC1D".toLowerCase(), "\uD801\uDC45", "DESERET CAPITAL LETTER ES");
+assert.sameValue("\uD801\uDC1E".toLowerCase(), "\uD801\uDC46", "DESERET CAPITAL LETTER ZEE");
+assert.sameValue("\uD801\uDC1F".toLowerCase(), "\uD801\uDC47", "DESERET CAPITAL LETTER ESH");
+assert.sameValue("\uD801\uDC20".toLowerCase(), "\uD801\uDC48", "DESERET CAPITAL LETTER ZHEE");
+assert.sameValue("\uD801\uDC21".toLowerCase(), "\uD801\uDC49", "DESERET CAPITAL LETTER ER");
+assert.sameValue("\uD801\uDC22".toLowerCase(), "\uD801\uDC4A", "DESERET CAPITAL LETTER EL");
+assert.sameValue("\uD801\uDC23".toLowerCase(), "\uD801\uDC4B", "DESERET CAPITAL LETTER EM");
+assert.sameValue("\uD801\uDC24".toLowerCase(), "\uD801\uDC4C", "DESERET CAPITAL LETTER EN");
+assert.sameValue("\uD801\uDC25".toLowerCase(), "\uD801\uDC4D", "DESERET CAPITAL LETTER ENG");
+assert.sameValue("\uD801\uDC26".toLowerCase(), "\uD801\uDC4E", "DESERET CAPITAL LETTER OI");
+assert.sameValue("\uD801\uDC27".toLowerCase(), "\uD801\uDC4F", "DESERET CAPITAL LETTER EW");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..454eb79544
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/this-value-not-obj-coercible.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.tolowercase
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var toLowerCase = String.prototype.toLowerCase;
+
+assert.sameValue(typeof toLowerCase, 'function');
+
+assert.throws(TypeError, function() {
+  toLowerCase.call(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  toLowerCase.call(null);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/browser.js b/js/src/tests/test262/built-ins/String/prototype/toString/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/length.js b/js/src/tests/test262/built-ins/String/prototype/toString/length.js
new file mode 100644
index 0000000000..ba4b6fa655
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/length.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tostring
+description: >
+  String.prototype.toString.length is 0.
+info: |
+  ECMAScript Standard Built-in Objects
+  ...
+  Every built-in Function object, including constructors, has a length
+  property whose value is an integer. Unless otherwise specified, this value
+  is equal to the largest number of named arguments shown in the subclause
+  headings for the function description, including optional parameters.
+  ...
+  Unless otherwise specified, the length property of a built-in Function
+  object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+  [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(String.prototype.toString, 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/name.js b/js/src/tests/test262/built-ins/String/prototype/toString/name.js
new file mode 100644
index 0000000000..bd3891423d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/name.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tostring
+description: >
+  String.prototype.toString.name is "toString".
+info: |
+  String.prototype.toString ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(String.prototype.toString, 'name', {
+  value: 'toString',
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/non-generic-realm.js b/js/src/tests/test262/built-ins/String/prototype/toString/non-generic-realm.js
new file mode 100644
index 0000000000..4f27e3528e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/non-generic-realm.js
@@ -0,0 +1,60 @@
+// Copyright (C) 2019 Aleksey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tostring
+description: >
+  Throws a TypeError if called on neither String primitive nor String object
+  (honoring the Realm of the current execution context)
+info: |
+  String.prototype.toString ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  [...]
+  3. Throw a TypeError exception.
+features: [cross-realm]
+---*/
+
+var other = $262.createRealm().global;
+var otherToString = other.String.prototype.toString;
+
+assert.throws(other.TypeError, function() {
+  otherToString.call(true);
+});
+
+assert.throws(other.TypeError, function() {
+  otherToString.call(0);
+});
+
+assert.throws(other.TypeError, function() {
+  otherToString.call(null);
+});
+
+assert.throws(other.TypeError, function() {
+  otherToString.call();
+});
+
+assert.throws(other.TypeError, function() {
+  otherToString.call(Symbol('desc'));
+});
+
+assert.throws(other.TypeError, function() {
+  otherToString.call({
+    valueOf: function() {
+      return 'str';
+    },
+  });
+});
+
+assert.throws(other.TypeError, function() {
+  otherToString.call([1]);
+});
+
+assert.throws(other.TypeError, function() {
+  'str'.concat({toString: otherToString});
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/non-generic.js b/js/src/tests/test262/built-ins/String/prototype/toString/non-generic.js
new file mode 100644
index 0000000000..1a78132963
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/non-generic.js
@@ -0,0 +1,57 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tostring
+description: >
+  Throws a TypeError if called on neither String primitive nor String object
+info: |
+  String.prototype.toString ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  [...]
+  3. Throw a TypeError exception.
+---*/
+
+var toString = String.prototype.toString;
+
+assert.throws(TypeError, function() {
+  toString.call(false);
+});
+
+assert.throws(TypeError, function() {
+  toString.call(1);
+});
+
+assert.throws(TypeError, function() {
+  toString.call(null);
+});
+
+assert.throws(TypeError, function() {
+  toString.call();
+});
+
+assert.throws(TypeError, function() {
+  toString.call(Symbol('desc'));
+});
+
+assert.throws(TypeError, function() {
+  toString.call({
+    toString: function() {
+      return 'str';
+    },
+  });
+});
+
+assert.throws(TypeError, function() {
+  toString.call(['s', 't', 'r']);
+});
+
+assert.throws(TypeError, function() {
+  ''.concat({toString: toString});
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/toString/not-a-constructor.js
new file mode 100644
index 0000000000..59cdfc18e5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.toString does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.toString),
+  false,
+  'isConstructor(String.prototype.toString) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.toString();
+}, '`new String.prototype.toString()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/shell.js b/js/src/tests/test262/built-ins/String/prototype/toString/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/string-object.js b/js/src/tests/test262/built-ins/String/prototype/toString/string-object.js
new file mode 100644
index 0000000000..834a4f41b9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/string-object.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tostring
+description: >
+  If called on a String object, returns [[StringData]] slot
+info: |
+  String.prototype.toString ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  [...]
+  2. If Type(value) is Object and value has a [[StringData]] internal slot, then
+    a. Let s be value.[[StringData]].
+    b. Assert: Type(s) is String.
+    c. Return s.
+---*/
+
+var toString = String.prototype.toString;
+
+assert.sameValue(Object('str').toString(), 'str');
+assert.sameValue(toString.call(new String('')), '');
+assert.sameValue('a'.concat(Object('b')), 'ab');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toString/string-primitive.js b/js/src/tests/test262/built-ins/String/prototype/toString/string-primitive.js
new file mode 100644
index 0000000000..18ce6eb295
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toString/string-primitive.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tostring
+description: >
+  If called on String primitive, returns it
+info: |
+  String.prototype.toString ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  1. If Type(value) is String, return value.
+---*/
+
+var toString = String.prototype.toString;
+
+assert.sameValue(''.toString(), '');
+assert.sameValue(toString.call('str'), 'str');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A10.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A10.js
new file mode 100644
index 0000000000..4924ada0a2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A10.js
@@ -0,0 +1,37 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toUpperCase.length property has the attribute
+    ReadOnly
+es5id: 15.5.4.18_A10
+description: >
+    Checking if varying the String.prototype.toUpperCase.length
+    property fails
+includes: [propertyHelper.js]
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toUpperCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#1: String.prototype.toUpperCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var __obj = String.prototype.toUpperCase.length;
+
+verifyNotWritable(String.prototype.toUpperCase, "length", null, function() {
+  return "shifted";
+});
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toUpperCase.length !== __obj) {
+  throw new Test262Error('#2: __obj = String.prototype.toUpperCase.length; String.prototype.toUpperCase.length = function(){return "shifted";}; String.prototype.toUpperCase.length === __obj. Actual: ' + String.prototype.toUpperCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A11.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A11.js
new file mode 100644
index 0000000000..4dfabc024d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A11.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: The length property of the toUpperCase method is 0
+es5id: 15.5.4.18_A11
+description: Checking String.prototype.toUpperCase.length
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!(String.prototype.toUpperCase.hasOwnProperty("length"))) {
+  throw new Test262Error('#1: String.prototype.toUpperCase.hasOwnProperty("length") return true. Actual: ' + String.prototype.toUpperCase.hasOwnProperty("length"));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toUpperCase.length !== 0) {
+  throw new Test262Error('#2: String.prototype.toUpperCase.length === 0. Actual: ' + String.prototype.toUpperCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T1.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T1.js
new file mode 100644
index 0000000000..6d4f92ae0f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T1.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T1
+description: Arguments is true, and instance is object
+---*/
+
+var __instance = new Object(true);
+
+__instance.toUpperCase = String.prototype.toUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toUpperCase() !== "TRUE") {
+  throw new Test262Error('#1: __instance = new Object(true); __instance.toUpperCase = String.prototype.toUpperCase;  __instance.toUpperCase() === "TRUE". Actual: ' + __instance.toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T10.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T10.js
new file mode 100644
index 0000000000..d978fb60b2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T10.js
@@ -0,0 +1,27 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T10
+description: >
+    Call toUpperCase() function of object with overrode toString
+    function
+---*/
+
+var __obj = {
+  toString: function() {
+    return "\u0041b";
+  }
+}
+__obj.toUpperCase = String.prototype.toUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toUpperCase() !== "AB") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return "\u0041b";}}; __obj.toUpperCase = String.prototype.toUpperCase; __obj.toUpperCase() ==="AB". Actual: ' + __obj.toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T11.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T11.js
new file mode 100644
index 0000000000..055b0d632e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T11.js
@@ -0,0 +1,31 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T11
+description: >
+    Override toString function, toString throw exception, then call
+    toUpperCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    throw "intostr";
+  }
+}
+__obj.toUpperCase = String.prototype.toUpperCase;
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toUpperCase();
+  throw new Test262Error('#1: "var x = __obj.toUpperCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T12.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T12.js
new file mode 100644
index 0000000000..71d08bb170
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T12.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T12
+description: >
+    Override toString and valueOf functions, valueOf throw exception,
+    then call toUpperCase() function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    throw "intostr";
+  }
+}
+__obj.toUpperCase = String.prototype.toUpperCase;
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+try {
+  var x = __obj.toUpperCase();
+  throw new Test262Error('#1: "var x = __obj.toUpperCase()" lead to throwing exception');
+} catch (e) {
+  if (e !== "intostr") {
+    throw new Test262Error('#1.1: Exception === "intostr". Actual: ' + e);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T13.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T13.js
new file mode 100644
index 0000000000..233416cc02
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T13.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T13
+description: >
+    Override toString and valueOf functions, then call toUpperCase()
+    function for this object
+---*/
+
+var __obj = {
+  toString: function() {
+    return {};
+  },
+  valueOf: function() {
+    return 1;
+  }
+}
+__obj.toUpperCase = String.prototype.toUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__obj.toUpperCase() !== "1") {
+  throw new Test262Error('#1: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toUpperCase = String.prototype.toUpperCase; __obj.toUpperCase() ==="1". Actual: ' + __obj.toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__obj.toUpperCase().length !== 1) {
+  throw new Test262Error('#2: var __obj = {toString:function(){return {};},valueOf:function(){return 1;}}; __obj.toUpperCase = String.prototype.toUpperCase; __obj.toUpperCase().length === 1. Actual: ' + __obj.toUpperCase().length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T14.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T14.js
new file mode 100644
index 0000000000..51048d5ba2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T14.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T14
+description: Call toUpperCase() function of RegExp object
+---*/
+
+var __reg = new RegExp("abc");
+__reg.toUpperCase = String.prototype.toUpperCase;
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__reg.toUpperCase() !== "/ABC/") {
+  throw new Test262Error('#1: var __reg = new RegExp("abc"); __reg.toUpperCase = String.prototype.toUpperCase; __reg.toUpperCase() === "/ABC/". Actual: ' + __reg.toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T2.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T2.js
new file mode 100644
index 0000000000..e1ab874b41
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T2.js
@@ -0,0 +1,22 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T2
+description: Instance is Boolean object
+---*/
+
+var __instance = new Boolean;
+
+__instance.toUpperCase = String.prototype.toUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.toUpperCase() !== "FALSE") {
+  throw new Test262Error('#1: __instance = new Boolean; __instance.toUpperCase = String.prototype.toUpperCase;  __instance.toUpperCase() === "FALSE". Actual: ' + __instance.toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T3.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T3.js
new file mode 100644
index 0000000000..0b4ed555f8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T3.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T3
+description: Checking by using eval
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (eval("\"bj\"").toUpperCase() !== "BJ") {
+  throw new Test262Error('#1: eval("\\"bj\\"").toUpperCase() === "BJ". Actual: ' + eval("\"bj\"").toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T4.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T4.js
new file mode 100644
index 0000000000..1de632e61d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T4.js
@@ -0,0 +1,48 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T4
+description: >
+    Call toUpperCase() function without arguments of string and from
+    empty string
+---*/
+
+var __lowerCase = "".toUpperCase();
+
+var __expected = "";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__lowerCase.length !== __expected.length) {
+  throw new Test262Error('#1: __lowerCase = "".toUpperCase(); __expected = ""; __lowerCase.length === __expected.length. Actual: ' + __lowerCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__lowerCase.index !== __expected.index) {
+  throw new Test262Error('#2: __lowerCase = "".toUpperCase(); __expected = ""; __lowerCase.index === __expected.index. Actual: ' + __lowerCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__lowerCase.input !== __expected.input) {
+  throw new Test262Error('#3: __lowerCase = "".toUpperCase(); __expected = ""; __lowerCase.input === __expected.input. Actual: ' + __lowerCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+if (__lowerCase[0] !== __expected[0]) {
+  throw new Test262Error('#4: __lowerCase = "".toUpperCase(); __expected = ""; __lowerCase[0]===' + __expected[0] + '. Actual: ' + __lowerCase[0]);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T5.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T5.js
new file mode 100644
index 0000000000..0e9e30fcb9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T5.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T5
+description: Call toUpperCase() function of function call
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(null) evaluates to "null" match(null) evaluates to match("null")
+if (function() {
+    return "GnulLuNa"
+  }().toUpperCase() !== "GNULLUNA") {
+  throw new Test262Error('#1: function(){return "GnulLuNa"}().toUpperCase() === "GNULLUNA". Actual: ' + function() {
+    return "GnulLuNa"
+  }().toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T6.js
new file mode 100644
index 0000000000..9dd923681c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T6.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T6
+description: Call toUpperCase() function of Number.NEGATIVE_INFINITY
+---*/
+
+Number.prototype.toUpperCase = String.prototype.toUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ((Number.NEGATIVE_INFINITY).toUpperCase() !== "-INFINITY") {
+  throw new Test262Error('#1: Number.prototype.toUpperCase = String.prototype.toUpperCase; (Number.NEGATIVE_INFINITY).toUpperCase() === "-INFINITY". Actual: ' + (Number.NEGATIVE_INFINITY).toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T7.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T7.js
new file mode 100644
index 0000000000..c7cf124363
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T7.js
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T7
+description: Call toUpperCase() function of NaN
+---*/
+
+Number.prototype.toUpperCase = String.prototype.toUpperCase;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (NaN.toUpperCase() !== "NAN") {
+  throw new Test262Error('#1: Number.prototype.toUpperCase = String.prototype.toUpperCase; NaN.toUpperCase()=== "NAN". Actual: ' + NaN.toUpperCase());
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T8.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T8.js
new file mode 100644
index 0000000000..5ad34efd9c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T8.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T8
+description: Call toUpperCase() function of Infinity;
+---*/
+
+Number.prototype.toUpperCase = String.prototype.toUpperCase;
+
+if (Infinity.toUpperCase() !== "INFINITY") {
+  throw new Test262Error('#1: Number.prototype.toUpperCase = String.prototype.toUpperCase; Infinity.toUpperCase()=== "INFINITY". Actual: ' + Infinity.toUpperCase());
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T9.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T9.js
new file mode 100644
index 0000000000..be7e1feb12
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A1_T9.js
@@ -0,0 +1,53 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase()
+es5id: 15.5.4.18_A1_T9
+description: Call toUpperCase() function of string object
+---*/
+
+var __obj = {
+  valueOf: function() {},
+  toString: void 0
+};
+
+var __upperCase = new String(__obj).toUpperCase();
+
+var __expected = "UNDEFINED";
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__upperCase.length !== __expected.length) {
+  throw new Test262Error('#1: __obj = {valueOf:function(){}, toString:void 0}; __upperCase = new String(__obj).toUpperCase(); __expected ="UNDEFINED"; __upperCase.length === __expected.length. Actual: ' + __upperCase.length);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (__upperCase.index !== __expected.index) {
+  throw new Test262Error('#2: __obj = {valueOf:function(){}, toString:void 0}; __upperCase = new String(__obj).toUpperCase(); __expected ="UNDEFINED"; __upperCase.index === __expected.index. Actual: ' + __upperCase.index);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if (__upperCase.input !== __expected.input) {
+  throw new Test262Error('#3: __obj = {valueOf:function(){}, toString:void 0}; __upperCase = new String(__obj).toUpperCase(); __expected ="UNDEFINED"; __upperCase.input === __expected.input. Actual: ' + __upperCase.input);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#4
+for (var index = 0; index < __expected.length; index++) {
+  if (__upperCase[index] !== __expected[index]) {
+    throw new Test262Error('#4.' + index + ': __obj = {valueOf:function(){}, toString:void 0}; __upperCase = new String(__obj).toUpperCase(); __expected ="UNDEFINED"; __upperCase[' + index + ']===' + __expected[index] + '. Actual: ' + __upperCase[index]);
+  }
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A2_T1.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A2_T1.js
new file mode 100644
index 0000000000..3bc31c16c1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A2_T1.js
@@ -0,0 +1,34 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase() return a string, but not a String object
+es5id: 15.5.4.18_A2_T1
+description: Checking returned result
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if ("Hello, WoRlD!".toUpperCase() !== "HELLO, WORLD!") {
+  throw new Test262Error('#1: "Hello, WoRlD!".toUpperCase() === "HELLO, WORLD!". Actual: ' + ("Hello, WoRlD!".toUpperCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if ("Hello, WoRlD!".toUpperCase() !== String("HELLO, WORLD!")) {
+  throw new Test262Error('#2: "Hello, WoRlD!".toUpperCase() === String("HELLO, WORLD!"). Actual: ' + ("Hello, WoRlD!".toUpperCase()));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#3
+if ("Hello, WoRlD!".toUpperCase() === new String("HELLO, WORLD!")) {
+  throw new Test262Error('#3: "Hello, WoRlD!".toUpperCase() !== new String("HELLO, WORLD!")');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A6.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A6.js
new file mode 100644
index 0000000000..d10a0c5625
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A6.js
@@ -0,0 +1,18 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase has not prototype property
+es5id: 15.5.4.18_A6
+description: Checking String.prototype.toUpperCase.prototype
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (String.prototype.toUpperCase.prototype !== undefined) {
+  throw new Test262Error('#1: String.prototype.toUpperCase.prototype === undefined. Actual: ' + String.prototype.toUpperCase.prototype);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A7.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A7.js
new file mode 100644
index 0000000000..b4f007741f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A7.js
@@ -0,0 +1,21 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.toUpperCase can't be used as constructor
+es5id: 15.5.4.18_A7
+description: Checking if creating the String.prototype.toUpperCase object fails
+---*/
+
+var __FACTORY = String.prototype.toUpperCase;
+
+try {
+  var __instance = new __FACTORY;
+  throw new Test262Error('#1: var __FACTORY = String.prototype.toUpperCase; "__instance = new __FACTORY" lead to throwing exception');
+} catch (e) {
+  if ((e instanceof TypeError) !== true) {
+    throw new Test262Error('#1.1: var __FACTORY = String.prototype.toUpperCase; "__instance = new __FACTORY" throw a TypeError. Actual: ' + (e));
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A8.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A8.js
new file mode 100644
index 0000000000..a44f896dc2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A8.js
@@ -0,0 +1,45 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toUpperCase.length property has the attribute
+    DontEnum
+es5id: 15.5.4.18_A8
+description: >
+    Checking if enumerating the String.prototype.toUpperCase.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toUpperCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toUpperCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#1
+if (String.prototype.toUpperCase.propertyIsEnumerable('length')) {
+  throw new Test262Error('#1: String.prototype.toUpperCase.propertyIsEnumerable(\'length\') return false');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+// CHECK#2
+var count = 0;
+
+for (var p in String.prototype.toUpperCase) {
+  if (p === "length") count++;
+}
+
+if (count !== 0) {
+  throw new Test262Error('#2: count=0; for (p in String.prototype.toUpperCase){if (p==="length") count++;}; count === 0. Actual: ' + count);
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A9.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A9.js
new file mode 100644
index 0000000000..1da084fcf5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/S15.5.4.18_A9.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The String.prototype.toUpperCase.length property does not have the
+    attribute DontDelete
+es5id: 15.5.4.18_A9
+description: >
+    Checking if deleting the String.prototype.toUpperCase.length
+    property fails
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#0
+if (!(String.prototype.toUpperCase.hasOwnProperty('length'))) {
+  throw new Test262Error('#0: String.prototype.toUpperCase.hasOwnProperty(\'length\') return true. Actual: ' + String.prototype.toUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (!delete String.prototype.toUpperCase.length) {
+  throw new Test262Error('#1: delete String.prototype.toUpperCase.length return true');
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#2
+if (String.prototype.toUpperCase.hasOwnProperty('length')) {
+  throw new Test262Error('#2: delete String.prototype.toUpperCase.length; String.prototype.toUpperCase.hasOwnProperty(\'length\') return false. Actual: ' + String.prototype.toUpperCase.hasOwnProperty('length'));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/browser.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/name.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/name.js
new file mode 100644
index 0000000000..9e2922beb0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.24
+description: >
+  String.prototype.toUpperCase.name is "toUpperCase".
+info: |
+  String.prototype.toUpperCase ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.toUpperCase.name, "toUpperCase");
+
+verifyNotEnumerable(String.prototype.toUpperCase, "name");
+verifyNotWritable(String.prototype.toUpperCase, "name");
+verifyConfigurable(String.prototype.toUpperCase, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/not-a-constructor.js
new file mode 100644
index 0000000000..4820c87b12
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.toUpperCase does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.toUpperCase),
+  false,
+  'isConstructor(String.prototype.toUpperCase) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.toUpperCase();
+}, '`new String.prototype.toUpperCase()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/shell.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/special_casing.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/special_casing.js
new file mode 100644
index 0000000000..520b6b33e0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/special_casing.js
@@ -0,0 +1,137 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Check if String.prototype.toUpperCase supports mappings defined in SpecialCasings
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+es5id: 15.5.4.18
+es6id: 21.1.3.24
+---*/
+
+// SpecialCasing.txt, except for conditional mappings.
+
+assert.sameValue("\u00DF".toUpperCase(), "\u0053\u0053", "LATIN SMALL LETTER SHARP S");
+
+assert.sameValue("\u0130".toUpperCase(), "\u0130", "LATIN CAPITAL LETTER I WITH DOT ABOVE");
+
+assert.sameValue("\uFB00".toUpperCase(), "\u0046\u0046", "LATIN SMALL LIGATURE FF");
+assert.sameValue("\uFB01".toUpperCase(), "\u0046\u0049", "LATIN SMALL LIGATURE FI");
+assert.sameValue("\uFB02".toUpperCase(), "\u0046\u004C", "LATIN SMALL LIGATURE FL");
+assert.sameValue("\uFB03".toUpperCase(), "\u0046\u0046\u0049", "LATIN SMALL LIGATURE FFI");
+assert.sameValue("\uFB04".toUpperCase(), "\u0046\u0046\u004C", "LATIN SMALL LIGATURE FFL");
+assert.sameValue("\uFB05".toUpperCase(), "\u0053\u0054", "LATIN SMALL LIGATURE LONG S T");
+assert.sameValue("\uFB06".toUpperCase(), "\u0053\u0054", "LATIN SMALL LIGATURE ST");
+
+assert.sameValue("\u0587".toUpperCase(), "\u0535\u0552", "ARMENIAN SMALL LIGATURE ECH YIWN");
+assert.sameValue("\uFB13".toUpperCase(), "\u0544\u0546", "ARMENIAN SMALL LIGATURE MEN NOW");
+assert.sameValue("\uFB14".toUpperCase(), "\u0544\u0535", "ARMENIAN SMALL LIGATURE MEN ECH");
+assert.sameValue("\uFB15".toUpperCase(), "\u0544\u053B", "ARMENIAN SMALL LIGATURE MEN INI");
+assert.sameValue("\uFB16".toUpperCase(), "\u054E\u0546", "ARMENIAN SMALL LIGATURE VEW NOW");
+assert.sameValue("\uFB17".toUpperCase(), "\u0544\u053D", "ARMENIAN SMALL LIGATURE MEN XEH");
+
+assert.sameValue("\u0149".toUpperCase(), "\u02BC\u004E", "LATIN SMALL LETTER N PRECEDED BY APOSTROPHE");
+
+assert.sameValue("\u0390".toUpperCase(), "\u0399\u0308\u0301", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS");
+assert.sameValue("\u03B0".toUpperCase(), "\u03A5\u0308\u0301", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS");
+
+assert.sameValue("\u01F0".toUpperCase(), "\u004A\u030C", "LATIN SMALL LETTER J WITH CARON");
+assert.sameValue("\u1E96".toUpperCase(), "\u0048\u0331", "LATIN SMALL LETTER H WITH LINE BELOW");
+assert.sameValue("\u1E97".toUpperCase(), "\u0054\u0308", "LATIN SMALL LETTER T WITH DIAERESIS");
+assert.sameValue("\u1E98".toUpperCase(), "\u0057\u030A", "LATIN SMALL LETTER W WITH RING ABOVE");
+assert.sameValue("\u1E99".toUpperCase(), "\u0059\u030A", "LATIN SMALL LETTER Y WITH RING ABOVE");
+assert.sameValue("\u1E9A".toUpperCase(), "\u0041\u02BE", "LATIN SMALL LETTER A WITH RIGHT HALF RING");
+
+assert.sameValue("\u1F50".toUpperCase(), "\u03A5\u0313", "GREEK SMALL LETTER UPSILON WITH PSILI");
+assert.sameValue("\u1F52".toUpperCase(), "\u03A5\u0313\u0300", "GREEK SMALL LETTER UPSILON WITH PSILI AND VARIA");
+assert.sameValue("\u1F54".toUpperCase(), "\u03A5\u0313\u0301", "GREEK SMALL LETTER UPSILON WITH PSILI AND OXIA");
+assert.sameValue("\u1F56".toUpperCase(), "\u03A5\u0313\u0342", "GREEK SMALL LETTER UPSILON WITH PSILI AND PERISPOMENI");
+assert.sameValue("\u1FB6".toUpperCase(), "\u0391\u0342", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI");
+assert.sameValue("\u1FC6".toUpperCase(), "\u0397\u0342", "GREEK SMALL LETTER ETA WITH PERISPOMENI");
+assert.sameValue("\u1FD2".toUpperCase(), "\u0399\u0308\u0300", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FD3".toUpperCase(), "\u0399\u0308\u0301", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FD6".toUpperCase(), "\u0399\u0342", "GREEK SMALL LETTER IOTA WITH PERISPOMENI");
+assert.sameValue("\u1FD7".toUpperCase(), "\u0399\u0308\u0342", "GREEK SMALL LETTER IOTA WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FE2".toUpperCase(), "\u03A5\u0308\u0300", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND VARIA");
+assert.sameValue("\u1FE3".toUpperCase(), "\u03A5\u0308\u0301", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND OXIA");
+assert.sameValue("\u1FE4".toUpperCase(), "\u03A1\u0313", "GREEK SMALL LETTER RHO WITH PSILI");
+assert.sameValue("\u1FE6".toUpperCase(), "\u03A5\u0342", "GREEK SMALL LETTER UPSILON WITH PERISPOMENI");
+assert.sameValue("\u1FE7".toUpperCase(), "\u03A5\u0308\u0342", "GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND PERISPOMENI");
+assert.sameValue("\u1FF6".toUpperCase(), "\u03A9\u0342", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI");
+
+assert.sameValue("\u1F80".toUpperCase(), "\u1F08\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F81".toUpperCase(), "\u1F09\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F82".toUpperCase(), "\u1F0A\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F83".toUpperCase(), "\u1F0B\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F84".toUpperCase(), "\u1F0C\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F85".toUpperCase(), "\u1F0D\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F86".toUpperCase(), "\u1F0E\u0399", "GREEK SMALL LETTER ALPHA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F87".toUpperCase(), "\u1F0F\u0399", "GREEK SMALL LETTER ALPHA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F88".toUpperCase(), "\u1F08\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F89".toUpperCase(), "\u1F09\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8A".toUpperCase(), "\u1F0A\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8B".toUpperCase(), "\u1F0B\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8C".toUpperCase(), "\u1F0C\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8D".toUpperCase(), "\u1F0D\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8E".toUpperCase(), "\u1F0E\u0399", "GREEK CAPITAL LETTER ALPHA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F8F".toUpperCase(), "\u1F0F\u0399", "GREEK CAPITAL LETTER ALPHA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1F90".toUpperCase(), "\u1F28\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F91".toUpperCase(), "\u1F29\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F92".toUpperCase(), "\u1F2A\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F93".toUpperCase(), "\u1F2B\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F94".toUpperCase(), "\u1F2C\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F95".toUpperCase(), "\u1F2D\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1F96".toUpperCase(), "\u1F2E\u0399", "GREEK SMALL LETTER ETA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1F97".toUpperCase(), "\u1F2F\u0399", "GREEK SMALL LETTER ETA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1F98".toUpperCase(), "\u1F28\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F99".toUpperCase(), "\u1F29\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9A".toUpperCase(), "\u1F2A\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9B".toUpperCase(), "\u1F2B\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9C".toUpperCase(), "\u1F2C\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9D".toUpperCase(), "\u1F2D\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9E".toUpperCase(), "\u1F2E\u0399", "GREEK CAPITAL LETTER ETA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1F9F".toUpperCase(), "\u1F2F\u0399", "GREEK CAPITAL LETTER ETA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FA0".toUpperCase(), "\u1F68\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA1".toUpperCase(), "\u1F69\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA2".toUpperCase(), "\u1F6A\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA3".toUpperCase(), "\u1F6B\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA4".toUpperCase(), "\u1F6C\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA5".toUpperCase(), "\u1F6D\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA6".toUpperCase(), "\u1F6E\u0399", "GREEK SMALL LETTER OMEGA WITH PSILI AND PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FA7".toUpperCase(), "\u1F6F\u0399", "GREEK SMALL LETTER OMEGA WITH DASIA AND PERISPOMENI AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FA8".toUpperCase(), "\u1F68\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FA9".toUpperCase(), "\u1F69\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAA".toUpperCase(), "\u1F6A\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAB".toUpperCase(), "\u1F6B\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND VARIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAC".toUpperCase(), "\u1F6C\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAD".toUpperCase(), "\u1F6D\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND OXIA AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAE".toUpperCase(), "\u1F6E\u0399", "GREEK CAPITAL LETTER OMEGA WITH PSILI AND PERISPOMENI AND PROSGEGRAMMENI");
+assert.sameValue("\u1FAF".toUpperCase(), "\u1F6F\u0399", "GREEK CAPITAL LETTER OMEGA WITH DASIA AND PERISPOMENI AND PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB3".toUpperCase(), "\u0391\u0399", "GREEK SMALL LETTER ALPHA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FBC".toUpperCase(), "\u0391\u0399", "GREEK CAPITAL LETTER ALPHA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FC3".toUpperCase(), "\u0397\u0399", "GREEK SMALL LETTER ETA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FCC".toUpperCase(), "\u0397\u0399", "GREEK CAPITAL LETTER ETA WITH PROSGEGRAMMENI");
+assert.sameValue("\u1FF3".toUpperCase(), "\u03A9\u0399", "GREEK SMALL LETTER OMEGA WITH YPOGEGRAMMENI");
+assert.sameValue("\u1FFC".toUpperCase(), "\u03A9\u0399", "GREEK CAPITAL LETTER OMEGA WITH PROSGEGRAMMENI");
+
+assert.sameValue("\u1FB2".toUpperCase(), "\u1FBA\u0399", "GREEK SMALL LETTER ALPHA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FB4".toUpperCase(), "\u0386\u0399", "GREEK SMALL LETTER ALPHA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC2".toUpperCase(), "\u1FCA\u0399", "GREEK SMALL LETTER ETA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC4".toUpperCase(), "\u0389\u0399", "GREEK SMALL LETTER ETA WITH OXIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF2".toUpperCase(), "\u1FFA\u0399", "GREEK SMALL LETTER OMEGA WITH VARIA AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF4".toUpperCase(), "\u038F\u0399", "GREEK SMALL LETTER OMEGA WITH OXIA AND YPOGEGRAMMENI");
+
+assert.sameValue("\u1FB7".toUpperCase(), "\u0391\u0342\u0399", "GREEK SMALL LETTER ALPHA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FC7".toUpperCase(), "\u0397\u0342\u0399", "GREEK SMALL LETTER ETA WITH PERISPOMENI AND YPOGEGRAMMENI");
+assert.sameValue("\u1FF7".toUpperCase(), "\u03A9\u0342\u0399", "GREEK SMALL LETTER OMEGA WITH PERISPOMENI AND YPOGEGRAMMENI");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/supplementary_plane.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/supplementary_plane.js
new file mode 100644
index 0000000000..97859bd79e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/supplementary_plane.js
@@ -0,0 +1,65 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: String.prototype.toUpperCase() iterates over code points
+info: |
+    21.1.3.24 String.prototype.toUpperCase ( )
+
+    This function behaves in exactly the same way as String.prototype.toLowerCase,
+    except that code points are mapped to their uppercase equivalents as specified
+    in the Unicode Character Database.
+
+    21.1.3.22 String.prototype.toLowerCase ( )
+
+    ...
+    4. Let cpList be a List containing in order the code points as defined in
+       6.1.4 of S, starting at the first element of S.
+    5. For each code point c in cpList, if the Unicode Character Database
+       provides a language insensitive lower case equivalent of c then replace
+       c in cpList with that equivalent code point(s).
+es6id: 21.1.3.24
+---*/
+
+assert.sameValue("\uD801\uDC28".toUpperCase(), "\uD801\uDC00", "DESERET SMALL LETTER LONG I");
+assert.sameValue("\uD801\uDC29".toUpperCase(), "\uD801\uDC01", "DESERET SMALL LETTER LONG E");
+assert.sameValue("\uD801\uDC2A".toUpperCase(), "\uD801\uDC02", "DESERET SMALL LETTER LONG A");
+assert.sameValue("\uD801\uDC2B".toUpperCase(), "\uD801\uDC03", "DESERET SMALL LETTER LONG AH");
+assert.sameValue("\uD801\uDC2C".toUpperCase(), "\uD801\uDC04", "DESERET SMALL LETTER LONG O");
+assert.sameValue("\uD801\uDC2D".toUpperCase(), "\uD801\uDC05", "DESERET SMALL LETTER LONG OO");
+assert.sameValue("\uD801\uDC2E".toUpperCase(), "\uD801\uDC06", "DESERET SMALL LETTER SHORT I");
+assert.sameValue("\uD801\uDC2F".toUpperCase(), "\uD801\uDC07", "DESERET SMALL LETTER SHORT E");
+assert.sameValue("\uD801\uDC30".toUpperCase(), "\uD801\uDC08", "DESERET SMALL LETTER SHORT A");
+assert.sameValue("\uD801\uDC31".toUpperCase(), "\uD801\uDC09", "DESERET SMALL LETTER SHORT AH");
+assert.sameValue("\uD801\uDC32".toUpperCase(), "\uD801\uDC0A", "DESERET SMALL LETTER SHORT O");
+assert.sameValue("\uD801\uDC33".toUpperCase(), "\uD801\uDC0B", "DESERET SMALL LETTER SHORT OO");
+assert.sameValue("\uD801\uDC34".toUpperCase(), "\uD801\uDC0C", "DESERET SMALL LETTER AY");
+assert.sameValue("\uD801\uDC35".toUpperCase(), "\uD801\uDC0D", "DESERET SMALL LETTER OW");
+assert.sameValue("\uD801\uDC36".toUpperCase(), "\uD801\uDC0E", "DESERET SMALL LETTER WU");
+assert.sameValue("\uD801\uDC37".toUpperCase(), "\uD801\uDC0F", "DESERET SMALL LETTER YEE");
+assert.sameValue("\uD801\uDC38".toUpperCase(), "\uD801\uDC10", "DESERET SMALL LETTER H");
+assert.sameValue("\uD801\uDC39".toUpperCase(), "\uD801\uDC11", "DESERET SMALL LETTER PEE");
+assert.sameValue("\uD801\uDC3A".toUpperCase(), "\uD801\uDC12", "DESERET SMALL LETTER BEE");
+assert.sameValue("\uD801\uDC3B".toUpperCase(), "\uD801\uDC13", "DESERET SMALL LETTER TEE");
+assert.sameValue("\uD801\uDC3C".toUpperCase(), "\uD801\uDC14", "DESERET SMALL LETTER DEE");
+assert.sameValue("\uD801\uDC3D".toUpperCase(), "\uD801\uDC15", "DESERET SMALL LETTER CHEE");
+assert.sameValue("\uD801\uDC3E".toUpperCase(), "\uD801\uDC16", "DESERET SMALL LETTER JEE");
+assert.sameValue("\uD801\uDC3F".toUpperCase(), "\uD801\uDC17", "DESERET SMALL LETTER KAY");
+assert.sameValue("\uD801\uDC40".toUpperCase(), "\uD801\uDC18", "DESERET SMALL LETTER GAY");
+assert.sameValue("\uD801\uDC41".toUpperCase(), "\uD801\uDC19", "DESERET SMALL LETTER EF");
+assert.sameValue("\uD801\uDC42".toUpperCase(), "\uD801\uDC1A", "DESERET SMALL LETTER VEE");
+assert.sameValue("\uD801\uDC43".toUpperCase(), "\uD801\uDC1B", "DESERET SMALL LETTER ETH");
+assert.sameValue("\uD801\uDC44".toUpperCase(), "\uD801\uDC1C", "DESERET SMALL LETTER THEE");
+assert.sameValue("\uD801\uDC45".toUpperCase(), "\uD801\uDC1D", "DESERET SMALL LETTER ES");
+assert.sameValue("\uD801\uDC46".toUpperCase(), "\uD801\uDC1E", "DESERET SMALL LETTER ZEE");
+assert.sameValue("\uD801\uDC47".toUpperCase(), "\uD801\uDC1F", "DESERET SMALL LETTER ESH");
+assert.sameValue("\uD801\uDC48".toUpperCase(), "\uD801\uDC20", "DESERET SMALL LETTER ZHEE");
+assert.sameValue("\uD801\uDC49".toUpperCase(), "\uD801\uDC21", "DESERET SMALL LETTER ER");
+assert.sameValue("\uD801\uDC4A".toUpperCase(), "\uD801\uDC22", "DESERET SMALL LETTER EL");
+assert.sameValue("\uD801\uDC4B".toUpperCase(), "\uD801\uDC23", "DESERET SMALL LETTER EM");
+assert.sameValue("\uD801\uDC4C".toUpperCase(), "\uD801\uDC24", "DESERET SMALL LETTER EN");
+assert.sameValue("\uD801\uDC4D".toUpperCase(), "\uD801\uDC25", "DESERET SMALL LETTER ENG");
+assert.sameValue("\uD801\uDC4E".toUpperCase(), "\uD801\uDC26", "DESERET SMALL LETTER OI");
+assert.sameValue("\uD801\uDC4F".toUpperCase(), "\uD801\uDC27", "DESERET SMALL LETTER EW");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toUpperCase/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..3114095957
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toUpperCase/this-value-not-obj-coercible.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.touppercase
+description: The "this" value must be object-coercible
+info: |
+  This function behaves in exactly the same way as
+  String.prototype.toLowerCase, except that code points are mapped to their
+  uppercase equivalents as specified in the Unicode Character Database.
+
+  21.1.3.24 String.prototype.toLowerCase
+
+  1. Let O be ? RequireObjectCoercible(this value).
+---*/
+
+var toUpperCase = String.prototype.toUpperCase;
+
+assert.sameValue(typeof toUpperCase, 'function');
+
+assert.throws(TypeError, function() {
+  toUpperCase.call(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  toUpperCase.call(null);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/browser.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/length.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/length.js
new file mode 100644
index 0000000000..8da16feb4e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/length.js
@@ -0,0 +1,24 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.towellformed
+description: >
+  String.prototype.toWellFormed.length value and descriptor.
+info: |
+  String.prototype.toWellFormed( )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.toWellFormed]
+---*/
+
+verifyProperty(String.prototype.toWellFormed, 'length', {
+  configurable: true,
+  enumerable: false,
+  writable: false,
+  value: 0
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/name.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/name.js
new file mode 100644
index 0000000000..f1befc1eea
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/name.js
@@ -0,0 +1,24 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.towellformed
+description: >
+  String.prototype.toWellFormed.name value and descriptor.
+info: |
+  String.prototype.toWellFormed( )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+features: [String.prototype.toWellFormed]
+---*/
+
+verifyProperty(String.prototype.toWellFormed, 'name', {
+  enumerable: false,
+  writable: false,
+  configurable: true,
+  value: 'toWellFormed'
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/not-a-constructor.js
new file mode 100644
index 0000000000..d8c64b85b8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/not-a-constructor.js
@@ -0,0 +1,35 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.includes does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [String.prototype.toWellFormed, Reflect.construct]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.toWellFormed),
+  false,
+  'isConstructor(String.prototype.toWellFormed) must return false'
+);
+
+assert.throws(TypeError, function () {
+  new String.prototype.toWellFormed();
+}, '`new String.prototype.toWellFormed()` throws TypeError');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/prop-desc.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/prop-desc.js
new file mode 100644
index 0000000000..c0217bd63f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/prop-desc.js
@@ -0,0 +1,28 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.towellformed
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.toWellFormed( )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [String.prototype.toWellFormed]
+---*/
+
+assert.sameValue(
+  typeof String.prototype.toWellFormed,
+  'function',
+  'The value of `typeof String.prototype.toWellFormed` is "function"'
+);
+
+verifyProperty(String.prototype, 'toWellFormed', {
+  enumerable: false,
+  writable: true,
+  configurable: true
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/return-abrupt-from-this.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/return-abrupt-from-this.js
new file mode 100644
index 0000000000..7053c7cc42
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/return-abrupt-from-this.js
@@ -0,0 +1,25 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.towellformed
+description: >
+  Return abrupt from RequireObjectCoercible(this value).
+info: |
+  String.prototype.toWellFormed( )
+
+  1. Let O be ? RequireObjectCoercible(this value).
+
+features: [String.prototype.toWellFormed]
+---*/
+assert.sameValue(typeof String.prototype.toWellFormed, 'function');
+
+assert.throws(TypeError, function () {
+  String.prototype.toWellFormed.call(undefined);
+}, '`String.prototype.toWellFormed.call(undefined)` throws TypeError');
+
+assert.throws(TypeError, function () {
+  String.prototype.toWellFormed.call(null);
+}, '`String.prototype.toWellFormed.call(null)` throws TypeError');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/returns-well-formed-string.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/returns-well-formed-string.js
new file mode 100644
index 0000000000..df77f0c598
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/returns-well-formed-string.js
@@ -0,0 +1,58 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.towellformed
+description: >
+  The method should return a well-formed string.
+info: |
+  String.prototype.toWellFormed ( )
+
+  1. Let O be ? RequireObjectCoercible(this value).
+  2. Let S be ? ToString(O).
+  3. Let strLen be the length of S.
+  4. Let k be 0.
+  5. Let result be the empty String.
+  6. Repeat, while k < strLen,
+    a. Let cp be CodePointAt(S, k).
+    b. If cp.[[IsUnpairedSurrogate]] is true, then
+      i. Set result to the string-concatenation of result and 0xFFFD (REPLACEMENT CHARACTER).
+    c. Else,
+      i. Set result to the string-concatenation of result and UTF16EncodeCodePoint(cp.[[CodePoint]]).
+    d. Set k to k + cp.[[CodeUnitCount]].
+  7. Return result.
+
+features: [String.prototype.toWellFormed]
+---*/
+assert.sameValue(typeof String.prototype.toWellFormed, 'function');
+
+var replacementChar = '\uFFFD';
+var leadingPoo = '\uD83D';
+var trailingPoo = '\uDCA9';
+var wholePoo = leadingPoo + trailingPoo;
+
+assert.sameValue(
+  ('a' + leadingPoo + 'c' + leadingPoo + 'e').toWellFormed(),
+  'a' + replacementChar + 'c' + replacementChar + 'e',
+  'lone leading surrogates are replaced with the expected replacement character'
+);
+assert.sameValue(
+  ('a' + trailingPoo + 'c' + trailingPoo + 'e').toWellFormed(),
+  'a' + replacementChar + 'c' + replacementChar + 'e',
+  'lone trailing surrogates are replaced with the expected replacement character'
+);
+assert.sameValue(
+  ('a' + trailingPoo + leadingPoo + 'd').toWellFormed(),
+  'a' + replacementChar + replacementChar + 'd',
+  'a wrong-ordered surrogate pair is replaced with two replacement characters'
+)
+
+assert.sameValue('a💩c'.toWellFormed(), 'a💩c', 'a surrogate pair using a literal code point is already well-formed');
+assert.sameValue('a\uD83D\uDCA9c'.toWellFormed(), 'a\uD83D\uDCA9c', 'a surrogate pair formed by escape sequences is already well-formed');
+assert.sameValue(('a' + leadingPoo + trailingPoo + 'd').toWellFormed(), 'a' + wholePoo + 'd', 'a surrogate pair formed by concatenation is already well-formed');
+assert.sameValue(wholePoo.slice(0, 1).toWellFormed(), replacementChar, 'a surrogate pair sliced to the leading surrogate is replaced with the expected replacement character');
+assert.sameValue(wholePoo.slice(1).toWellFormed(), replacementChar, 'a surrogate pair sliced to the trailing surrogate is replaced with the expected replacement character');
+assert.sameValue('abc'.toWellFormed(), 'abc', 'a latin-1 string is already well-formed');
+assert.sameValue('a\u25A8c'.toWellFormed(), 'a\u25A8c', 'a string with a non-ASCII character is already well-formed');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/shell.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/to-string-primitive.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/to-string-primitive.js
new file mode 100644
index 0000000000..81584490b0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/to-string-primitive.js
@@ -0,0 +1,35 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.towellformed
+description: >
+  The method should coerce the receiver to a string.
+info: |
+  String.prototype.toWellFormed ( )
+
+  2. Let S be ? ToString(O).
+  …
+
+features: [String.prototype.toWellFormed]
+---*/
+
+const tests = [
+  [true, "true", Boolean.prototype],
+  [1, "1", Number.prototype],
+  [1n, "1", BigInt.prototype],
+];
+
+for (const [v, expected, proto] of tests) {
+  proto.toString = function() {
+    throw new Test262Error(`should not call toString on the prototype for ${typeof v}`);
+  }
+  let result = String.prototype.toWellFormed.call(v);
+  delete proto.toString;
+  assert.sameValue(result, expected, `toWellFormed for ${typeof v}`);
+}
+
+Symbol.prototype.toString = function() { throw new TypeError("should not call toString on the prototype for Symbol"); }
+assert.throws(TypeError, () => String.prototype.toWellFormed.call(Symbol()), `Built-in result for Symbol`);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/toWellFormed/to-string.js b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/to-string.js
new file mode 100644
index 0000000000..200f9ccd16
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/toWellFormed/to-string.js
@@ -0,0 +1,30 @@
+// |reftest| shell-option(--enable-well-formed-unicode-strings) skip-if(!String.prototype.toWellFormed||!xulRuntime.shell) -- String.prototype.toWellFormed is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Jordan Harband. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.towellformed
+description: >
+  The method should coerce the receiver to a string.
+info: |
+  String.prototype.toWellFormed ( )
+
+  1. Let O be ? RequireObjectCoercible(this value).
+  2. Let S be ? ToString(O).
+  …
+
+features: [String.prototype.toWellFormed]
+---*/
+
+var obj = {
+    toString: function () {
+        throw new Test262Error('calls ToString');
+    }
+};
+
+assert.throws(
+    Test262Error,
+    function () { String.prototype.toWellFormed.call(obj); },
+    'coerces the receiver to a string'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-0-1.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-0-1.js
new file mode 100644
index 0000000000..8356c795a6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-0-1.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-0-1
+description: String.prototype.trim must exist as a function
+---*/
+
+var f = String.prototype.trim;
+
+assert.sameValue(typeof(f), "function", 'typeof(f)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-0-2.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-0-2.js
new file mode 100644
index 0000000000..79a711dae3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-0-2.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-0-2
+description: String.prototype.trim must exist as a function taking 0 parameters
+---*/
+
+assert.sameValue(String.prototype.trim.length, 0, 'String.prototype.trim.length');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-1.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-1.js
new file mode 100644
index 0000000000..a269a8c051
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-1.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-1
+description: String.prototype.trim throws TypeError when string is undefined
+---*/
+
+
+assert.throws(TypeError, function() {
+  String.prototype.trim.call(undefined);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-2.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-2.js
new file mode 100644
index 0000000000..9401c3c35d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-2.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-2
+description: String.prototype.trim throws TypeError when string is null
+---*/
+
+
+assert.throws(TypeError, function() {
+  String.prototype.trim.call(null);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-3.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-3.js
new file mode 100644
index 0000000000..e08c9a6c61
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-3.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-3
+description: String.prototype.trim works for primitive type boolean
+---*/
+
+assert.sameValue(String.prototype.trim.call(true), "true", 'String.prototype.trim.call(true)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-4.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-4.js
new file mode 100644
index 0000000000..e19bb4eb48
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-4.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-4
+description: String.prototype.trim works for primitive type number
+---*/
+
+assert.sameValue(String.prototype.trim.call(0), "0", 'String.prototype.trim.call(0)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-5.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-5.js
new file mode 100644
index 0000000000..bace97dc52
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-5.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-5
+description: String.prototype.trim works for an Object
+---*/
+
+assert.sameValue(String.prototype.trim.call({}), "[object Object]", 'String.prototype.trim.call({})');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-6.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-6.js
new file mode 100644
index 0000000000..8332f891bb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-6.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-6
+description: String.prototype.trim works for an String
+---*/
+
+assert.sameValue(String.prototype.trim.call(new String()), "", 'String.prototype.trim.call(new String())');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-7.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-7.js
new file mode 100644
index 0000000000..a19bcb489c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-7.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-7
+description: String.prototype.trim works for a primitive string
+---*/
+
+assert.sameValue(String.prototype.trim.call("abc"), "abc", 'String.prototype.trim.call("abc")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-8.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-8.js
new file mode 100644
index 0000000000..0db004bc69
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-8.js
@@ -0,0 +1,16 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-8
+description: >
+    String.prototype.trim works for a primitive string (value is '
+    abc')
+---*/
+
+var strObj = String("    abc");
+
+assert.sameValue(strObj.trim(), "abc", 'strObj.trim()');
+assert.sameValue(strObj.toString(), "    abc", 'strObj.toString()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-9.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-9.js
new file mode 100644
index 0000000000..97e767d831
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-1-9.js
@@ -0,0 +1,15 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-1-9
+description: >
+    String.prototype.trim works for a String object which value is
+    undefined
+---*/
+
+var strObj = new String(undefined);
+
+assert.sameValue(strObj.trim(), "undefined", 'strObj.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-1.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-1.js
new file mode 100644
index 0000000000..64777d2f6c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-1.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-1
+description: >
+    String.prototype.trim - argument 'this' is a boolean whose value
+    is false
+---*/
+
+assert.sameValue(String.prototype.trim.call(false), "false", 'String.prototype.trim.call(false)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-10.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-10.js
new file mode 100644
index 0000000000..3a5a2abfe8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-10.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-10
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is +Infinity)
+---*/
+
+assert.sameValue(String.prototype.trim.call(+Infinity), "Infinity", 'String.prototype.trim.call(+Infinity)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-11.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-11.js
new file mode 100644
index 0000000000..a9811bc1d4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-11.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-11
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is -Infinity)
+---*/
+
+assert.sameValue(String.prototype.trim.call(-Infinity), "-Infinity", 'String.prototype.trim.call(-Infinity)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-12.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-12.js
new file mode 100644
index 0000000000..ee58574fd2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-12.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-12
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1(following 20 zeros))
+---*/
+
+assert.sameValue(String.prototype.trim.call(100000000000000000000), "100000000000000000000", 'String.prototype.trim.call(100000000000000000000)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-13.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-13.js
new file mode 100644
index 0000000000..0eb7e26e30
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-13.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-13
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1(following 21 zeros))
+---*/
+
+assert.sameValue(String.prototype.trim.call(1000000000000000000000), "1e+21", 'String.prototype.trim.call(1000000000000000000000)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-14.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-14.js
new file mode 100644
index 0000000000..5566838564
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-14.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-14
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1(following 22 zeros))
+---*/
+
+assert.sameValue(String.prototype.trim.call(10000000000000000000000), "1e+22", 'String.prototype.trim.call(10000000000000000000000)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-15.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-15.js
new file mode 100644
index 0000000000..0a4e50bfa7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-15.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-15
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1e+20)
+---*/
+
+assert.sameValue(String.prototype.trim.call(1e+20), "100000000000000000000", 'String.prototype.trim.call(1e+20)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-16.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-16.js
new file mode 100644
index 0000000000..cae3236cfb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-16.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-16
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to string (value is 1e+21)
+---*/
+
+assert.sameValue(String.prototype.trim.call(1e+21), "1e+21", 'String.prototype.trim.call(1e+21)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-17.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-17.js
new file mode 100644
index 0000000000..7358155593
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-17.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-17
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to string (value is 1e+22)
+---*/
+
+assert.sameValue(String.prototype.trim.call(1e+22), "1e+22", 'String.prototype.trim.call(1e+22)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-18.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-18.js
new file mode 100644
index 0000000000..bf2ce163b1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-18.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-18
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 0.000001)
+---*/
+
+assert.sameValue(String.prototype.trim.call(0.000001), "0.000001", 'String.prototype.trim.call(0.000001)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-19.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-19.js
new file mode 100644
index 0000000000..2017155aac
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-19.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-19
+description: >
+    String.prototype.trim - argument argument 'this' is a number that
+    converts to a string (value is 0.0000001)
+---*/
+
+assert.sameValue(String.prototype.trim.call(0.0000001), "1e-7", 'String.prototype.trim.call(0.0000001)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-2.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-2.js
new file mode 100644
index 0000000000..0cabe22e0c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-2.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-2
+description: >
+    String.prototype.trim - argument 'this' is a boolean whose value
+    is true
+---*/
+
+assert.sameValue(String.prototype.trim.call(true), "true", 'String.prototype.trim.call(true)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-20.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-20.js
new file mode 100644
index 0000000000..30a21e6d38
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-20.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-20
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 0.00000001)
+---*/
+
+assert.sameValue(String.prototype.trim.call(0.00000001), "1e-8", 'String.prototype.trim.call(0.00000001)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-21.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-21.js
new file mode 100644
index 0000000000..73718c68a3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-21.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-21
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1e-7)
+---*/
+
+assert.sameValue(String.prototype.trim.call(1e-7), "1e-7", 'String.prototype.trim.call(1e-7)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-22.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-22.js
new file mode 100644
index 0000000000..dd0ae89b4f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-22.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-22
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1e-6)
+---*/
+
+assert.sameValue(String.prototype.trim.call(1e-6), "0.000001", 'String.prototype.trim.call(1e-6)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-23.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-23.js
new file mode 100644
index 0000000000..39b6168d30
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-23.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-23
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1e-5)
+---*/
+
+assert.sameValue(String.prototype.trim.call(1e-5), "0.00001", 'String.prototype.trim.call(1e-5)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-24.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-24.js
new file mode 100644
index 0000000000..9f78f2a2ff
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-24.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-24
+description: >
+    String.prototype.trim - argument 'this' is an integer that
+    converts to a string (value is 123)
+---*/
+
+assert.sameValue(String.prototype.trim.call(123), "123", 'String.prototype.trim.call(123)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-25.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-25.js
new file mode 100644
index 0000000000..510465a130
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-25.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-25
+description: >
+    String.prototype.trim - argument 'this' is a decimal that converts
+    to a string (value is 123.456)
+---*/
+
+assert.sameValue(String.prototype.trim.call(123.456), "123.456", 'String.prototype.trim.call(123.456)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-26.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-26.js
new file mode 100644
index 0000000000..0260d57cc7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-26.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-26
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 1(following 20 zeros).123)
+---*/
+
+assert.sameValue(String.prototype.trim.call(100000000000000000000.123), "100000000000000000000", 'String.prototype.trim.call(100000000000000000000.123)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-27.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-27.js
new file mode 100644
index 0000000000..812db57de4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-27.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-27
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 123.1234567)
+---*/
+
+assert.sameValue(String.prototype.trim.call(123.1234567), "123.1234567", 'String.prototype.trim.call(123.1234567)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-28.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-28.js
new file mode 100644
index 0000000000..8c6c9c6566
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-28.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-28
+description: String.prototype.trim - argument 'this' is an empty string
+---*/
+
+assert.sameValue(String.prototype.trim.call(""), "", 'String.prototype.trim.call("")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-29.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-29.js
new file mode 100644
index 0000000000..3618258ef1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-29.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-29
+description: >
+    String.prototype.trim - argument 'this' is a string(value is 'AB
+    \cd')
+---*/
+
+assert.sameValue(String.prototype.trim.call("AB\n\\cd"), "AB\n\\cd", 'String.prototype.trim.call("AB\n\\cd")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-3.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-3.js
new file mode 100644
index 0000000000..1b345ee9cb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-3.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-3
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is NaN)
+---*/
+
+assert.sameValue(String.prototype.trim.call(NaN), "NaN", 'String.prototype.trim.call(NaN)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-30.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-30.js
new file mode 100644
index 0000000000..84c8a964ad
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-30.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-30
+description: >
+    String.prototype.trim - argument 'this' is a string(value is
+    'undefined')
+---*/
+
+assert.sameValue(String.prototype.trim.call("undefined"), "undefined", 'String.prototype.trim.call("undefined")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-31.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-31.js
new file mode 100644
index 0000000000..fded952e0c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-31.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-31
+description: >
+    String.prototype.trim - argument 'this' is a string(value is
+    'null')
+---*/
+
+assert.sameValue(String.prototype.trim.call("null"), "null", 'String.prototype.trim.call("null")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-32.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-32.js
new file mode 100644
index 0000000000..7d28522bc0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-32.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-32
+description: >
+    String.prototype.trim - argument 'this' is a string(value is
+    '123#$%abc')
+---*/
+
+assert.sameValue(String.prototype.trim.call("123#$%abc"), "123#$%abc", 'String.prototype.trim.call("123#$%abc")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-33.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-33.js
new file mode 100644
index 0000000000..7bee4339ef
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-33.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-33
+description: String.prototype.trim - argument 'this' is a string(value is '1')
+---*/
+
+assert.sameValue(String.prototype.trim.call("1"), "1", 'String.prototype.trim.call("1")');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-34.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-34.js
new file mode 100644
index 0000000000..8807b094f9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-34.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-34
+description: >
+    String.prototype.trim - 'this' is an array that converts to a
+    string
+---*/
+
+assert.sameValue(String.prototype.trim.call([1]), '1', 'String.prototype.trim.call([1])');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-35.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-35.js
new file mode 100644
index 0000000000..fc932b8ae5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-35.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-35
+description: >
+    String.prototype.trim - 'this' is a String Object that converts to
+    a string
+---*/
+
+assert.sameValue(String.prototype.trim.call(new String("abc")), "abc", 'String.prototype.trim.call(new String("abc"))');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-36.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-36.js
new file mode 100644
index 0000000000..641386bc94
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-36.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-36
+description: >
+    String.prototype.trim - 'this' is a Boolean Object that converts
+    to a string
+---*/
+
+assert.sameValue(String.prototype.trim.call(new Boolean(false)), "false", 'String.prototype.trim.call(new Boolean(false))');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-37.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-37.js
new file mode 100644
index 0000000000..fa7814c61e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-37.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-37
+description: >
+    String.prototype.trim - 'this' is a Number Object that converts to
+    a string
+---*/
+
+assert.sameValue(String.prototype.trim.call(new Number(123)), "123", 'String.prototype.trim.call(new Number(123))');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-38.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-38.js
new file mode 100644
index 0000000000..20b065ffd8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-38.js
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-38
+description: >
+    String.prototype.trim - 'this' is an object which has an own
+    toString method
+---*/
+
+var obj = {
+  toString: function() {
+    return "abc";
+  }
+};
+
+assert.sameValue(String.prototype.trim.call(obj), "abc", 'String.prototype.trim.call(obj)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-39.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-39.js
new file mode 100644
index 0000000000..0b3cad4092
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-39.js
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-39
+description: >
+    String.prototype.trim - 'this' is an object which has an own
+    valueOf method
+---*/
+
+var obj = {
+  valueOf: function() {
+    return "abc";
+  }
+};
+
+assert.sameValue(String.prototype.trim.call(obj), "[object Object]", 'String.prototype.trim.call(obj)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-4.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-4.js
new file mode 100644
index 0000000000..017891e177
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-4.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-4
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is 0)
+---*/
+
+assert.sameValue(String.prototype.trim.call(0), "0", 'String.prototype.trim.call(0)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-40.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-40.js
new file mode 100644
index 0000000000..87e4daa935
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-40.js
@@ -0,0 +1,29 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-40
+description: >
+    String.prototype.trim - 'this' is an object that has an own
+    toString method that returns an object and valueOf method that
+    returns a primitive value
+---*/
+
+var toStringAccessed = false;
+var valueOfAccessed = false;
+var obj = {
+  toString: function() {
+    toStringAccessed = true;
+    return {};
+  },
+  valueOf: function() {
+    valueOfAccessed = true;
+    return "abc";
+  }
+};
+
+assert.sameValue(String.prototype.trim.call(obj), "abc", 'String.prototype.trim.call(obj)');
+assert(valueOfAccessed, 'valueOfAccessed !== true');
+assert(toStringAccessed, 'toStringAccessed !== true');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-41.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-41.js
new file mode 100644
index 0000000000..cf30a3e129
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-41.js
@@ -0,0 +1,28 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-41
+description: >
+    String.prototype.trim - 'this' is an object which has an own
+    toString and valueOf method.
+---*/
+
+var toStringAccessed = false;
+var valueOfAccessed = false;
+var obj = {
+  toString: function() {
+    toStringAccessed = true;
+    return "abc";
+  },
+  valueOf: function() {
+    valueOfAccessed = true;
+    return "cef";
+  }
+};
+
+assert.sameValue(String.prototype.trim.call(obj), "abc", 'String.prototype.trim.call(obj)');
+assert.sameValue(valueOfAccessed, false, 'valueOfAccessed');
+assert(toStringAccessed, 'toStringAccessed !== true');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-42.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-42.js
new file mode 100644
index 0000000000..fc63f81172
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-42.js
@@ -0,0 +1,30 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-42
+description: >
+    String.prototype.trim - TypeError exception was thrown  when
+    'this' is an object that both toString and valueOf wouldn't return
+    primitive value.
+---*/
+
+var toStringAccessed = false;
+var valueOfAccessed = false;
+var obj = {
+  toString: function() {
+    toStringAccessed = true;
+    return {};
+  },
+  valueOf: function() {
+    valueOfAccessed = true;
+    return {};
+  }
+};
+assert.throws(TypeError, function() {
+  String.prototype.trim.call(obj);
+});
+assert(valueOfAccessed, 'valueOfAccessed !== true');
+assert(toStringAccessed, 'toStringAccessed !== true');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-43.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-43.js
new file mode 100644
index 0000000000..f579223fec
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-43.js
@@ -0,0 +1,35 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-43
+description: >
+    String.prototype.trim - 'this' is an object with an own valueOf
+    and inherited toString methods with hint string, verify inherited
+    toString method will be called first
+---*/
+
+var toStringAccessed = false;
+var valueOfAccessed = false;
+
+var proto = {
+  toString: function() {
+    toStringAccessed = true;
+    return "abc";
+  }
+};
+
+var Con = function() {};
+Con.prototype = proto;
+
+var child = new Con();
+child.valueOf = function() {
+  valueOfAccessed = true;
+  return "efg";
+};
+
+assert.sameValue(String.prototype.trim.call(child), "abc", 'String.prototype.trim.call(child)');
+assert(toStringAccessed, 'toStringAccessed !== true');
+assert.sameValue(valueOfAccessed, false, 'valueOfAccessed');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-44.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-44.js
new file mode 100644
index 0000000000..5b9a41b105
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-44.js
@@ -0,0 +1,15 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-44
+description: >
+    String.prototype.trim - 'this' is a string that contains east
+    Asian characters (value is 'SD咕噜')
+---*/
+
+var str = "SD咕噜";
+
+assert.sameValue(str.trim(), str, 'str.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-45.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-45.js
new file mode 100644
index 0000000000..de56d44a01
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-45.js
@@ -0,0 +1,16 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-45
+description: >
+    String.prototype.trim - 'this' is a string that contains white
+    space, character, number, object and null characters
+---*/
+
+var str = "abc" + "   " + 123 + "   " + {} + "    " + "\u0000";
+var str1 = "    " + str + "    ";
+
+assert.sameValue(str1.trim(), str, 'str1.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-46.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-46.js
new file mode 100644
index 0000000000..9968dcf5da
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-46.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-46
+description: >
+    String.prototype.trim - 'this' is a Function Object that converts
+    to a string
+---*/
+
+var funObj = function() {
+  return arguments;
+};
+
+assert.sameValue(typeof(String.prototype.trim.call(funObj)), "string", 'typeof(String.prototype.trim.call(funObj))');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-47.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-47.js
new file mode 100644
index 0000000000..10b4243db4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-47.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-47
+description: >
+    String.prototype.trim - 'this' is a object Object that converts to
+    a string
+---*/
+
+assert.sameValue(String.prototype.trim.call({}), "[object Object]", 'String.prototype.trim.call({})');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-49.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-49.js
new file mode 100644
index 0000000000..3da8e68673
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-49.js
@@ -0,0 +1,15 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-49
+description: >
+    String.prototype.trim - 'this' is a RegExp Object that converts to
+    a string
+---*/
+
+var regObj = new RegExp(/test/);
+
+assert.sameValue(String.prototype.trim.call(regObj), "/test/", 'String.prototype.trim.call(regObj)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-5.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-5.js
new file mode 100644
index 0000000000..3f6168a04a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-5.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-5
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is +0)
+---*/
+
+assert.sameValue(String.prototype.trim.call(+0), "0", 'String.prototype.trim.call(+0)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-50.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-50.js
new file mode 100644
index 0000000000..5ad23d1bf5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-50.js
@@ -0,0 +1,15 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-50
+description: >
+    String.prototype.trim - 'this' is a Error Object that converts to
+    a string
+---*/
+
+var errObj = new Error("test");
+
+assert.sameValue(String.prototype.trim.call(errObj), "Error: test", 'String.prototype.trim.call(errObj)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-51.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-51.js
new file mode 100644
index 0000000000..f1786b34de
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-51.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-51
+description: >
+    String.prototype.trim - 'this' is a Arguments Object that converts
+    to a string
+---*/
+
+var argObj = function() {
+  return arguments;
+}(1, 2, true);
+
+assert.sameValue(String.prototype.trim.call(argObj), "[object Arguments]", 'String.prototype.trim.call(argObj)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-6.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-6.js
new file mode 100644
index 0000000000..6df39e44d0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-6.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-6
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is -0)
+---*/
+
+assert.sameValue(String.prototype.trim.call(-0), "0", 'String.prototype.trim.call(-0)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-7.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-7.js
new file mode 100644
index 0000000000..522738214a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-7.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-7
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is positive number)
+---*/
+
+assert.sameValue(String.prototype.trim.call(30), "30", 'String.prototype.trim.call(30)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-8.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-8.js
new file mode 100644
index 0000000000..4b07be308c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-8.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-8
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is negative number)
+---*/
+
+assert.sameValue(String.prototype.trim.call(-20), "-20", 'String.prototype.trim.call(-20)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-9.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-9.js
new file mode 100644
index 0000000000..7d9216a6f5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-2-9.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-2-9
+description: >
+    String.prototype.trim - argument 'this' is a number that converts
+    to a string (value is Infinity)
+---*/
+
+assert.sameValue(String.prototype.trim.call(Infinity), "Infinity", 'String.prototype.trim.call(Infinity)');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-1.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-1.js
new file mode 100644
index 0000000000..96b06c6b9f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-1.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-1
+description: String.prototype.trim - 'S' is a string with all LineTerminator
+---*/
+
+var lineTerminatorsStr = "\u000A\u000D\u2028\u2029";
+
+assert.sameValue(lineTerminatorsStr.trim(), "", 'lineTerminatorsStr.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-10.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-10.js
new file mode 100644
index 0000000000..5970916ea4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-10.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-10
+description: >
+    String.prototype.trim - 'S' is a string with null character
+    ('\u0000')
+---*/
+
+assert.sameValue("\u0000".trim(), "\u0000", '"\u0000".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-11.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-11.js
new file mode 100644
index 0000000000..cf2050d7d0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-11.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-11
+description: >
+    String.prototype.trim - 'S' is a string that starts with null
+    character
+---*/
+
+assert.sameValue("\0\u0000abc".trim(), "\0\u0000abc", '"\0\u0000abc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-12.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-12.js
new file mode 100644
index 0000000000..e878c14c5d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-12.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-12
+description: >
+    String.prototype.trim - 'S' is a string that ends with null
+    character
+---*/
+
+assert.sameValue("abc\0\u0000".trim(), "abc\0\u0000", '"abc\0\u0000".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-13.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-13.js
new file mode 100644
index 0000000000..73a64e0e4c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-13.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-13
+description: >
+    String.prototype.trim - 'S' is a string that starts with null
+    character and ends with null character
+---*/
+
+assert.sameValue("\0\u0000abc\0\u0000".trim(), "\0\u0000abc\0\u0000", '"\0\u0000abc\0\u0000".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-14.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-14.js
new file mode 100644
index 0000000000..220415d464
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-14.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-14
+description: >
+    String.prototype.trim - 'S' is a string that has null character in
+    the middle
+---*/
+
+assert.sameValue("a\0\u0000bc".trim(), "a\0\u0000bc", '"a\0\u0000bc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-2.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-2.js
new file mode 100644
index 0000000000..9181e9a575
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-2.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-2
+description: String.prototype.trim - 'S' is a string with all WhiteSpace
+---*/
+
+var whiteSpacesStr = "\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF";
+
+assert.sameValue(whiteSpacesStr.trim(), "", 'whiteSpacesStr.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-3.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-3.js
new file mode 100644
index 0000000000..bdcd6d317a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-3.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-3
+description: >
+    String.prototype.trim - 'S' is a string with all union of
+    WhiteSpace and LineTerminator
+---*/
+
+var lineTerminatorsStr = "\u000A\u000D\u2028\u2029";
+var whiteSpacesStr = "\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF";
+var str = whiteSpacesStr + lineTerminatorsStr;
+
+assert.sameValue(str.trim(), "", 'str.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-4.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-4.js
new file mode 100644
index 0000000000..429e6fce11
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-4.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-4
+description: >
+    String.prototype.trim - 'S' is a string start with union of all
+    LineTerminator and all WhiteSpace
+---*/
+
+var lineTerminatorsStr = "\u000A\u000D\u2028\u2029";
+var whiteSpacesStr = "\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF";
+var str = whiteSpacesStr + lineTerminatorsStr + "abc";
+
+assert.sameValue(str.trim(), "abc", 'str.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-5.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-5.js
new file mode 100644
index 0000000000..f917b2f2b7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-5.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-5
+description: >
+    String.prototype.trim - 'S' is a string end with union of all
+    LineTerminator and all WhiteSpace
+---*/
+
+var lineTerminatorsStr = "\u000A\u000D\u2028\u2029";
+var whiteSpacesStr = "\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF";
+var str = "abc" + whiteSpacesStr + lineTerminatorsStr;
+
+assert.sameValue(str.trim(), "abc", 'str.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-6.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-6.js
new file mode 100644
index 0000000000..5f0852d44b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-6.js
@@ -0,0 +1,18 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-6
+description: >
+    String.prototype.trim - 'S' is a string start with union of all
+    LineTerminator and all WhiteSpace and end with union of all
+    LineTerminator and all WhiteSpace
+---*/
+
+var lineTerminatorsStr = "\u000A\u000D\u2028\u2029";
+var whiteSpacesStr = "\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF";
+var str = whiteSpacesStr + lineTerminatorsStr + "abc" + whiteSpacesStr + lineTerminatorsStr;
+
+assert.sameValue(str.trim(), "abc", 'str.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-7.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-7.js
new file mode 100644
index 0000000000..f506b8f2ff
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-7.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-7
+description: >
+    String.prototype.trim - 'S' is a string that union of
+    LineTerminator and WhiteSpace in the middle
+---*/
+
+var lineTerminatorsStr = "\u000A\u000D\u2028\u2029";
+var whiteSpacesStr = "\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF";
+var str = "ab" + whiteSpacesStr + lineTerminatorsStr + "cd";
+
+assert.sameValue(str.trim(), str, 'str.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-8.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-8.js
new file mode 100644
index 0000000000..a715128193
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-8.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-8
+description: String.prototype.trim - 'S' is a string with all null character
+---*/
+
+assert.sameValue("\0\u0000".trim(), "\0\u0000", '"\0\u0000".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-9.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-9.js
new file mode 100644
index 0000000000..b05f48d1bb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-3-9.js
@@ -0,0 +1,11 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-3-9
+description: String.prototype.trim - 'S' is a string with null character ('\0')
+---*/
+
+assert.sameValue("\0".trim(), "\0", '"\0".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-1.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-1.js
new file mode 100644
index 0000000000..668a8a067a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-1.js
@@ -0,0 +1,18 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-1
+description: >
+    String.prototype.trim handles multiline string with whitepace and
+    lineterminators
+---*/
+
+var s = "\u0009a b\
+c \u0009"
+
+
+
+assert.sameValue(s.trim(), "a bc", 's.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-10.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-10.js
new file mode 100644
index 0000000000..027aa59396
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-10.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-10
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\uFEFFabc)
+---*/
+
+assert.sameValue("\uFEFFabc".trim(), "abc", '"\uFEFFabc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-11.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-11.js
new file mode 100644
index 0000000000..c2f29c86bc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-11.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-11
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u0009)
+---*/
+
+assert.sameValue("abc\u0009".trim(), "abc", '"abc\u0009".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-12.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-12.js
new file mode 100644
index 0000000000..e9ab5a6938
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-12.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-12
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u000B)
+---*/
+
+assert.sameValue("abc\u000B".trim(), "abc", '"abc\u000B".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-13.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-13.js
new file mode 100644
index 0000000000..f386d46fdf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-13.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-13
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u000C)
+---*/
+
+assert.sameValue("abc\u000C".trim(), "abc", '"abc\u000C".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-14.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-14.js
new file mode 100644
index 0000000000..2844170718
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-14.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-14
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u0020)
+---*/
+
+assert.sameValue("abc\u0020".trim(), "abc", '"abc\u0020".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-16.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-16.js
new file mode 100644
index 0000000000..79d9e91c92
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-16.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-16
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u00A0)
+---*/
+
+assert.sameValue("abc\u00A0".trim(), "abc", '"abc\u00A0".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-18.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-18.js
new file mode 100644
index 0000000000..92c21f5d75
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-18.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-18
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\uFEFF)
+---*/
+
+assert.sameValue("abc\uFEFF".trim(), "abc", '"abc\uFEFF".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-19.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-19.js
new file mode 100644
index 0000000000..03dd00e641
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-19.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-19
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u0009abc\u0009)
+---*/
+
+assert.sameValue("\u0009abc\u0009".trim(), "abc", '"\u0009abc\u0009".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-2.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-2.js
new file mode 100644
index 0000000000..8015077a77
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-2.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-2
+description: >
+    String.prototype.trim handles whitepace and lineterminators (
+    \u0009abc \u0009)
+---*/
+
+assert.sameValue(" \u0009abc \u0009".trim(), "abc", '" \u0009abc \u0009".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-20.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-20.js
new file mode 100644
index 0000000000..9461d07d4f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-20.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-20
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Babc\u000B)
+---*/
+
+assert.sameValue("\u000Babc\u000B".trim(), "abc", '"\u000Babc\u000B".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-21.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-21.js
new file mode 100644
index 0000000000..aee6aa7a50
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-21.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-21
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Cabc\u000C)
+---*/
+
+assert.sameValue("\u000Cabc\u000C".trim(), "abc", '"\u000Cabc\u000C".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-22.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-22.js
new file mode 100644
index 0000000000..40e1e968ae
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-22.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-22
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u0020abc\u0020)
+---*/
+
+assert.sameValue("\u0020abc\u0020".trim(), "abc", '"\u0020abc\u0020".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-24.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-24.js
new file mode 100644
index 0000000000..f750bdcc9d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-24.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-24
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u00A0abc\u00A0)
+---*/
+
+assert.sameValue("\u00A0abc\u00A0".trim(), "abc", '"\u00A0abc\u00A0".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-27.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-27.js
new file mode 100644
index 0000000000..2f2d01333b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-27.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-27
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u0009\u0009)
+---*/
+
+assert.sameValue("\u0009\u0009".trim(), "", '"\u0009\u0009".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-28.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-28.js
new file mode 100644
index 0000000000..0b6ad4bb65
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-28.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-28
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000B\u000B)
+---*/
+
+assert.sameValue("\u000B\u000B".trim(), "", '"\u000B\u000B".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-29.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-29.js
new file mode 100644
index 0000000000..8931f72d35
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-29.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-29
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000C\u000C)
+---*/
+
+assert.sameValue("\u000C\u000C".trim(), "", '"\u000C\u000C".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-3.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-3.js
new file mode 100644
index 0000000000..9bf4d59664
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-3.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-3
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u0009abc)
+---*/
+
+assert.sameValue("\u0009abc".trim(), "abc", '"\u0009abc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-30.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-30.js
new file mode 100644
index 0000000000..19edd41756
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-30.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-30
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u0020\u0020)
+---*/
+
+assert.sameValue("\u0020\u0020".trim(), "", '"\u0020\u0020".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-32.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-32.js
new file mode 100644
index 0000000000..655e95d819
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-32.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-32
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u00A0\u00A0)
+---*/
+
+assert.sameValue("\u00A0\u00A0".trim(), "", '"\u00A0\u00A0".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-34.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-34.js
new file mode 100644
index 0000000000..4b6e1ec258
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-34.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-34
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\uFEFF\uFEFF)
+---*/
+
+assert.sameValue("\uFEFF\uFEFF".trim(), "", '"\uFEFF\uFEFF".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-35.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-35.js
new file mode 100644
index 0000000000..c5c3b7dd75
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-35.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-35
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\u0009c)
+---*/
+
+assert.sameValue("ab\u0009c".trim(), "ab\u0009c", '"ab\u0009c".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-36.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-36.js
new file mode 100644
index 0000000000..7fdc2f9185
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-36.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-36
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\u000Bc)
+---*/
+
+assert.sameValue("ab\u000Bc".trim(), "ab\u000Bc", '"ab\u000Bc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-37.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-37.js
new file mode 100644
index 0000000000..dbee1c80e5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-37.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-37
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\u000Cc)
+---*/
+
+assert.sameValue("ab\u000Cc".trim(), "ab\u000Cc", '"ab\u000Cc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-38.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-38.js
new file mode 100644
index 0000000000..d0bf8d1f16
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-38.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-38
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\u0020c)
+---*/
+
+assert.sameValue("ab\u0020c".trim(), "ab\u0020c", '"ab\u0020c".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-39.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-39.js
new file mode 100644
index 0000000000..c5942adbd6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-39.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-39
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\u0085c)
+---*/
+
+assert.sameValue("ab\u0085c".trim(), "ab\u0085c", '"ab\u0085c".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-4.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-4.js
new file mode 100644
index 0000000000..b835eb401d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-4.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-4
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Babc)
+---*/
+
+assert.sameValue("\u000Babc".trim(), "abc", '"\u000Babc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-40.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-40.js
new file mode 100644
index 0000000000..12b8e7a386
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-40.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-40
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\u00A0c)
+---*/
+
+assert.sameValue("ab\u00A0c".trim(), "ab\u00A0c", '"ab\u00A0c".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-41.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-41.js
new file mode 100644
index 0000000000..a94ad1fe0a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-41.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-41
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\u200Bc)
+---*/
+
+assert.sameValue("ab\u200Bc".trim(), "ab\u200Bc", '"ab\u200Bc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-42.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-42.js
new file mode 100644
index 0000000000..9bbfeb1c18
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-42.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-42
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (ab\uFEFFc)
+---*/
+
+assert.sameValue("ab\uFEFFc".trim(), "ab\uFEFFc", '"ab\uFEFFc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-43.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-43.js
new file mode 100644
index 0000000000..76c84b1026
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-43.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-43
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Aabc)
+---*/
+
+assert.sameValue("\u000Aabc".trim(), "abc", '"\u000Aabc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-44.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-44.js
new file mode 100644
index 0000000000..9de5946f88
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-44.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-44
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Dabc)
+---*/
+
+assert.sameValue("\u000Dabc".trim(), "abc", '"\u000Dabc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-45.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-45.js
new file mode 100644
index 0000000000..5a6a71d014
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-45.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-45
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u2028abc)
+---*/
+
+assert.sameValue("\u2028abc".trim(), "abc", '"\u2028abc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-46.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-46.js
new file mode 100644
index 0000000000..3f7e429639
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-46.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-46
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u2029abc)
+---*/
+
+assert.sameValue("\u2029abc".trim(), "abc", '"\u2029abc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-47.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-47.js
new file mode 100644
index 0000000000..ac61dd81a3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-47.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-47
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u000A)
+---*/
+
+assert.sameValue("abc\u000A".trim(), "abc", '"abc\u000A".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-48.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-48.js
new file mode 100644
index 0000000000..ea0524f95c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-48.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-48
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u000D)
+---*/
+
+assert.sameValue("abc\u000D".trim(), "abc", '"abc\u000D".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-49.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-49.js
new file mode 100644
index 0000000000..cfacd63b85
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-49.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-49
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u2028)
+---*/
+
+assert.sameValue("abc\u2028".trim(), "abc", '"abc\u2028".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-5.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-5.js
new file mode 100644
index 0000000000..6c349986d2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-5.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-5
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Cabc)
+---*/
+
+assert.sameValue("\u000Cabc".trim(), "abc", '"\u000Cabc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-50.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-50.js
new file mode 100644
index 0000000000..395c2e7f75
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-50.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-50
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (abc\u2029)
+---*/
+
+assert.sameValue("abc\u2029".trim(), "abc", '"abc\u2029".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-51.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-51.js
new file mode 100644
index 0000000000..e9af0ed887
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-51.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-51
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Aabc\u000A)
+---*/
+
+assert.sameValue("\u000Aabc\u000A".trim(), "abc", '"\u000Aabc\u000A".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-52.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-52.js
new file mode 100644
index 0000000000..ab0db3c2e5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-52.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-52
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000Dabc\u000D)
+---*/
+
+assert.sameValue("\u000Dabc\u000D".trim(), "abc", '"\u000Dabc\u000D".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-53.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-53.js
new file mode 100644
index 0000000000..45eef4e3e1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-53.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-53
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u2028abc\u2028)
+---*/
+
+assert.sameValue("\u2028abc\u2028".trim(), "abc", '"\u2028abc\u2028".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-54.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-54.js
new file mode 100644
index 0000000000..ac47638692
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-54.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-54
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u2029abc\u2029)
+---*/
+
+assert.sameValue("\u2029abc\u2029".trim(), "abc", '"\u2029abc\u2029".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-55.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-55.js
new file mode 100644
index 0000000000..6e128e63de
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-55.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-55
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000A\u000A)
+---*/
+
+assert.sameValue("\u000A\u000A".trim(), "", '"\u000A\u000A".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-56.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-56.js
new file mode 100644
index 0000000000..b4295f8d1b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-56.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-56
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u000D\u000D)
+---*/
+
+assert.sameValue("\u000D\u000D".trim(), "", '"\u000D\u000D".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-57.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-57.js
new file mode 100644
index 0000000000..9da86804f1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-57.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-57
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u2028\u2028)
+---*/
+
+assert.sameValue("\u2028\u2028".trim(), "", '"\u2028\u2028".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-58.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-58.js
new file mode 100644
index 0000000000..3e89d9d961
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-58.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-58
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u2029\u2029)
+---*/
+
+assert.sameValue("\u2029\u2029".trim(), "", '"\u2029\u2029".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-59.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-59.js
new file mode 100644
index 0000000000..b308590072
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-59.js
@@ -0,0 +1,16 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-59
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u2029abc as a multiline string)
+---*/
+
+var s = "\u2029\
+           abc";
+
+assert.sameValue(s.trim(), "abc", 's.trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-6.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-6.js
new file mode 100644
index 0000000000..19574a6ba8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-6.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-6
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u0020abc)
+---*/
+
+assert.sameValue("\u0020abc".trim(), "abc", '"\u0020abc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-60.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-60.js
new file mode 100644
index 0000000000..836b10967c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-60.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-60
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (string with just blanks)
+---*/
+
+assert.sameValue("    ".trim(), "", '"    ".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-8.js b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-8.js
new file mode 100644
index 0000000000..968ae6290e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/15.5.4.20-4-8.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 15.5.4.20-4-8
+description: >
+    String.prototype.trim handles whitepace and lineterminators
+    (\u00A0abc)
+---*/
+
+assert.sameValue("\u00A0abc".trim(), "abc", '"\u00A0abc".trim()');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/browser.js b/js/src/tests/test262/built-ins/String/prototype/trim/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/name.js b/js/src/tests/test262/built-ins/String/prototype/trim/name.js
new file mode 100644
index 0000000000..3f983c303c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/name.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 21.1.3.25
+description: >
+  String.prototype.trim.name is "trim".
+info: |
+  String.prototype.trim ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(String.prototype.trim.name, "trim");
+
+verifyNotEnumerable(String.prototype.trim, "name");
+verifyNotWritable(String.prototype.trim, "name");
+verifyConfigurable(String.prototype.trim, "name");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/trim/not-a-constructor.js
new file mode 100644
index 0000000000..20118ff8fc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.trim does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.trim),
+  false,
+  'isConstructor(String.prototype.trim) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.trim();
+}, '`new String.prototype.trim()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/shell.js b/js/src/tests/test262/built-ins/String/prototype/trim/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/trim/u180e.js b/js/src/tests/test262/built-ins/String/prototype/trim/u180e.js
new file mode 100644
index 0000000000..8b26b5cbbd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trim/u180e.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2016 Mathias Bynens. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-white-space
+description: >
+  U+180E is no longer a Unicode `Space_Separator` symbol as of Unicode v6.3.0.
+info: |
+  String.prototype.trim ( )
+
+  3. [...] The definition of white space is the union of |WhiteSpace| and
+     |LineTerminator|.
+features: [u180e]
+---*/
+
+assert.sameValue("_\u180E".trim(), "_\u180E");
+assert.sameValue("\u180E".trim(), "\u180E");
+assert.sameValue("\u180E_".trim(), "\u180E_");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/browser.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/length.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/length.js
new file mode 100644
index 0000000000..793721823e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/length.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  String.prototype.trimEnd.length is 0.
+info: >
+  String.prototype.trimEnd ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description, including optional
+    parameters. However, rest parameters shown using the form “...name”
+    are not included in the default argument count.
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+verifyProperty(String.prototype.trimEnd, "length", {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/name.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/name.js
new file mode 100644
index 0000000000..ad2c4d0d31
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/name.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  String.prototype.trimEnd.name is "trimEnd".
+info: >
+  String.prototype.trimEnd ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+verifyProperty(String.prototype.trimEnd, "name", {
+  value: "trimEnd",
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/not-a-constructor.js
new file mode 100644
index 0000000000..0d8bea1970
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.trimEnd does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, string-trimming, String.prototype.trimEnd, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.trimEnd),
+  false,
+  'isConstructor(String.prototype.trimEnd) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.trimEnd();
+}, '`new String.prototype.trimEnd()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/prop-desc.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/prop-desc.js
new file mode 100644
index 0000000000..e0c43bc095
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/prop-desc.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2017 The Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  "trimEnd" property of String.prototype
+info: >
+  17 ECMAScript Standard Built-in Objects:
+
+  Every other data property described in clauses 18 through 26 and in Annex B.2
+  has the attributes { [[Writable]]: true, [[Enumerable]]: false,
+  [[Configurable]]: true } unless otherwise specified.
+includes: [propertyHelper.js]
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+verifyProperty(String.prototype, "trimEnd", {
+  enumerable: false,
+  writable: true,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/shell.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-boolean.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-boolean.js
new file mode 100644
index 0000000000..e4d99dc291
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-boolean.js
@@ -0,0 +1,33 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: Behavior when "this" value is a boolean.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  2. Let S be ? ToString(str).
+
+  ToString ( argument )
+  Argument Type: Boolean
+  Result:
+    If argument is true, return "true".
+    If argument is false, return "false".
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+var trimEnd = String.prototype.trimEnd
+
+assert.sameValue(
+  trimEnd.call(true),
+  'true',
+  'String.prototype.trimEnd.call(true)'
+);
+
+assert.sameValue(
+  String.prototype.trimEnd.call(false),
+  'false',
+  'String.prototype.trimEnd.call(false)'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-line-terminator.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-line-terminator.js
new file mode 100644
index 0000000000..1e78fd4d51
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-line-terminator.js
@@ -0,0 +1,32 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: TrimEnd removes all line terminators from the end of a string.
+info: |
+  Runtime Symantics: TrimString ( string, where )
+  ...
+  4. Else if where is "end", let T be a String value that is a copy of S with
+     trailing white space removed.
+  ...
+
+  The definition of white space is the union of WhiteSpace and LineTerminator.
+
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+var trimEnd = String.prototype.trimEnd;
+
+// A string of all valid LineTerminator Unicode code points
+var lt = '\u000A\u000D\u2028\u2029';
+
+var str = lt + 'a' + lt + 'b' + lt;
+var expected = lt + 'a' + lt + 'b';
+
+assert.sameValue(
+  trimEnd.call(str),
+  expected
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..5ceea74ebf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-not-obj-coercible.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+var trimEnd = String.prototype.trimEnd;
+
+assert.sameValue(typeof trimEnd, 'function');
+
+assert.throws(TypeError, function() {
+  trimEnd.call(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  trimEnd.call(null);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-number.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-number.js
new file mode 100644
index 0000000000..8446048b56
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-number.js
@@ -0,0 +1,49 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: Behavoir when "this" value is a number.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  2. Let S be ? ToString(str).
+
+  ToString ( argument )
+  Argument Type: Number
+  Result: NumberToString(argument)
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+var trimEnd = String.prototype.trimEnd
+
+assert.sameValue(
+  trimEnd.call(NaN),
+  'NaN',
+  'String.prototype.trimEnd.call(NaN)'
+);
+
+assert.sameValue(
+  trimEnd.call(Infinity),
+  'Infinity',
+  'String.prototype.trimEnd.call(Infinity)'
+);
+
+assert.sameValue(
+  trimEnd.call(-0),
+  '0',
+  'String.prototype.trimEnd.call(-0)'
+);
+
+assert.sameValue(
+  trimEnd.call(1),
+  '1',
+  'String.prototype.trimEnd.call(1)'
+);
+
+assert.sameValue(
+  trimEnd.call(-1),
+  '-1',
+  'String.prototype.trimEnd.call(-1)'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-cannot-convert-to-primitive-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-cannot-convert-to-primitive-err.js
new file mode 100644
index 0000000000..eb3e3a9dca
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-cannot-convert-to-primitive-err.js
@@ -0,0 +1,63 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  This value is an object which cannot be converted to a primitive
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+    6. Throw a TypeError exception.
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+assert.sameValue(typeof String.prototype.trimEnd, "function");
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf: undefined,
+};
+
+// If trimEnd is called on an object with neither Symbol.toPrimitive, toString
+// nor valueOf defined, then a TypeError exception should be thrown.
+assert.throws(
+  TypeError,
+  function() {
+    String.prototype.trimEnd.call(thisVal);
+  }
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-call-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-call-err.js
new file mode 100644
index 0000000000..a59c2cb84e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-call-err.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Abrupt completion when getting Symbol.toPrimitive method
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive).
+   ...
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-meth-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-meth-err.js
new file mode 100644
index 0000000000..7237a7f670
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-meth-err.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+    Abrupt completion when Symbol.toPrimitive abrupt completes.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive).
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+   ...
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: function() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-meth-priority.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-meth-priority.js
new file mode 100644
index 0000000000..57f92112d1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-meth-priority.js
@@ -0,0 +1,82 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Priority of Symbol[toPrimitive] when converting object to string for trimming
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+   ...
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+
+var toPrimitiveAccessed = 0;
+var toStringAccessed = 0;
+var valueOfAccessed = 0;
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    toPrimitiveAccessed += 1;
+    return function() {
+      return '42 ';
+    };
+  },
+  get toString() {
+    toStringAccessed += 1;
+    return function() {
+      return '';
+    };
+  },
+  get valueOf() {
+    valueOfAccessed += 1;
+    return function() {
+      return '';
+    };
+  },
+};
+
+// Test that thisVal[Symbol.toPrimitive] has been called.
+
+var result = String.prototype.trimEnd.call(thisVal);
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal[Symbol.toPrimitive] expected to have been accessed.'
+);
+assert.sameValue(
+  result,
+  '42',
+  'thisVal[Symbol.toPrimitive] expected to have been called.'
+);
+
+// Test that thisVal.toString and thisVal.valueOf have not been accessedo
+
+assert.sameValue(
+  toStringAccessed,
+  0,
+  'thisVal.toString should not have been accessed.'
+);
+assert.sameValue(
+  valueOfAccessed,
+  0,
+  'thisVal.valueOf should not have been accessed.'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-returns-object-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-returns-object-err.js
new file mode 100644
index 0000000000..7405357aec
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-toprimitive-returns-object-err.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+    Abrupt completion when Symbol.toPrimitive returns an object
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If arguement is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive).
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+   ...
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: function() {
+    return {};
+  },
+};
+
+assert.sameValue(typeof String.prototype.trimEnd, 'function');
+assert.throws(TypeError, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-call-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-call-err.js
new file mode 100644
index 0000000000..9cff1caedf
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-call-err.js
@@ -0,0 +1,53 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Abrupt completion when getting toString method
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  get toString() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-meth-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-meth-err.js
new file mode 100644
index 0000000000..3f19b7b84b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-meth-err.js
@@ -0,0 +1,55 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Abrupt completion when toString called and abrupt completes.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: function() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-meth-priority.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-meth-priority.js
new file mode 100644
index 0000000000..0a46f14354
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-meth-priority.js
@@ -0,0 +1,99 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Priority of toString when converting object to string for trimming
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+   ...
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var toPrimitiveAccessed = 0;
+var toStringAccessed = 0;
+var valueOfAccessed = 0;
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    toPrimitiveAccessed += 1;
+    return undefined;
+  },
+  get toString() {
+    toStringAccessed += 1;
+    return function() {
+      return '42 ';
+    };
+  },
+  get valueOf() {
+    valueOfAccessed += 1;
+    return function() {
+      return '';
+    };
+  },
+};
+
+// Test that toString is called when Symbol.toPrimitive is undefined.
+
+var result = String.prototype.trimEnd.call(thisVal)
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal.toString expected to have been accessed.'
+);
+assert.sameValue(
+  result,
+  '42',
+  'thisVal.toString expected to have been called.'
+);
+
+// Test that thisVal[toPrimitive] has been accessed.
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal[Symbol.toPrimitive should have been accessed.'
+);
+
+// Test that thisVal.valueOf has not been accessed.
+
+assert.sameValue(
+  valueOfAccessed,
+  0,
+  'thisVal.valueOf should not have been accessed.'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-returns-object-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-returns-object-err.js
new file mode 100644
index 0000000000..1acf34e68d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-tostring-returns-object-err.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Abrupt completion when toString called and returns an object
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+    6. Throw a TypeError exception.
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: function() {
+    return {};
+  },
+};
+
+assert.sameValue(typeof String.prototype.trimEnd, 'function');
+assert.throws(TypeError, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-call-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-call-err.js
new file mode 100644
index 0000000000..e9942b432b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-call-err.js
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Abrupt completion when getting valueOf method
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  get valueOf() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-meth-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-meth-err.js
new file mode 100644
index 0000000000..f143313869
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-meth-err.js
@@ -0,0 +1,56 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Abrupt completion when valueOf called and abrupt completes.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf: function() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-meth-priority.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-meth-priority.js
new file mode 100644
index 0000000000..45f4bc73c4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-meth-priority.js
@@ -0,0 +1,95 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Priority of valueOf when converting object to string for trimming
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+   ...
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+var toPrimitiveAccessed = 0;
+var toStringAccessed = 0;
+var valueOfAccessed = 0;
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    toPrimitiveAccessed += 1;
+    return undefined;
+  },
+  get toString() {
+    toStringAccessed += 1;
+    return undefined;
+  },
+  get valueOf() {
+    valueOfAccessed += 1;
+    return function() {
+      return '42 ';
+    };
+  },
+};
+
+// Test that valueOf is called when Symbol.toPrimitive and toString are both
+// undefined.
+
+var result = String.prototype.trimEnd.call(thisVal);
+
+assert.sameValue(
+  valueOfAccessed,
+  1,
+  'thisVal.toString expected to have been accessed.'
+);
+assert.sameValue(
+  result,
+  '42',
+  'thisVal.valueOf expected to have been called.'
+);
+
+// Test that thisVal[toPrimitive] and thisVal.toString has been accessed.
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal[Symbol.toPrimitive should have been accessed.'
+);
+assert.sameValue(
+  toStringAccessed,
+  1,
+  'thisVal[Symbol.toString should have been accessed.'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-returns-object-err.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-returns-object-err.js
new file mode 100644
index 0000000000..00e4041850
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-object-valueof-returns-object-err.js
@@ -0,0 +1,60 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: >
+  Abrupt completion when valueOf called and returns an object
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+    6. Throw a TypeError exception.
+features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
+---*/
+
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf: function() {
+    return {};
+  },
+};
+
+assert.sameValue(typeof String.prototype.trimEnd, 'function');
+assert.throws(TypeError, function() {
+  String.prototype.trimEnd.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-symbol-typeerror.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-symbol-typeerror.js
new file mode 100644
index 0000000000..5150212023
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-symbol-typeerror.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: Type error when "this" value is a Symbol
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  2. Let S be ? ToString(str).
+
+  ToString ( argument )
+  Argument Type: Symbol
+  Result: Throw a TypeError exception
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+assert.sameValue(typeof String.prototype.trimEnd, "function");
+
+var trimEnd = String.prototype.trimEnd;
+var symbol = Symbol();
+
+assert.throws(
+  TypeError,
+  function() {
+    trimEnd.call(symbol);
+  },
+  'String.prototype.trimEnd.call(Symbol())'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-whitespace.js b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-whitespace.js
new file mode 100644
index 0000000000..27e8a832c2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimEnd/this-value-whitespace.js
@@ -0,0 +1,35 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimEnd
+description: TrimEnd removes all whitespace from the end of a string.
+info: |
+  Runtime Symantics: TrimString ( string, where )
+  ...
+  3. Else if where is "end", let T be a String value that is a copy of S with
+     trailing white space removed.
+  ...
+
+  The definition of white space is the union of WhiteSpace and LineTerminator.
+  When determining whether a Unicode code point is in Unicode general category
+  “Zs”, code unit sequences are interpreted as UTF-16 encoded code point
+  sequences as specified in 6.1.4.
+
+features: [string-trimming, String.prototype.trimEnd]
+---*/
+
+var trimEnd = String.prototype.trimEnd;
+
+// A string of all valid WhiteSpace Unicode code points
+var wspc = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
+
+var str = wspc + 'a' + wspc + 'b' + wspc;
+var expected = wspc + 'a' + wspc + 'b';
+
+assert.sameValue(
+  trimEnd.call(str),
+  expected
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/browser.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/length.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/length.js
new file mode 100644
index 0000000000..3f0d76dfcc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/length.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  String.prototype.trimStart.length is 0.
+info: >
+  String.prototype.trimStart ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description, including optional
+    parameters. However, rest parameters shown using the form “...name”
+    are not included in the default argument count.
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+verifyProperty(String.prototype.trimStart, "length", {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/name.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/name.js
new file mode 100644
index 0000000000..c75a9aa849
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/name.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  String.prototype.trimStart.name is "trimStart".
+info: >
+  String.prototype.trimStart ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+verifyProperty(String.prototype.trimStart, "name", {
+  value: "trimStart",
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/not-a-constructor.js
new file mode 100644
index 0000000000..fe6ba1ca22
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.trimStart does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, string-trimming, String.prototype.trimStart, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.trimStart),
+  false,
+  'isConstructor(String.prototype.trimStart) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.trimStart();
+}, '`new String.prototype.trimStart()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/prop-desc.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/prop-desc.js
new file mode 100644
index 0000000000..f005ff0351
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/prop-desc.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2017 The Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  "trimStart" property of String.prototype
+info: >
+  17 ECMAScript Standard Built-in Objects:
+
+  Every other data property described in clauses 18 through 26 and in Annex B.2
+  has the attributes { [[Writable]]: true, [[Enumerable]]: false,
+  [[Configurable]]: true } unless otherwise specified.
+includes: [propertyHelper.js]
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+verifyProperty(String.prototype, "trimStart", {
+  enumerable: false,
+  writable: true,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/shell.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-boolean.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-boolean.js
new file mode 100644
index 0000000000..3155491447
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-boolean.js
@@ -0,0 +1,33 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: Behavior when "this" value is a boolean.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  2. Let S be ? ToString(str).
+
+  ToString ( argument )
+  Argument Type: Boolean
+  Result:
+    If argument is true, return "true".
+    If argument is false, return "false".
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+var trimStart = String.prototype.trimStart
+
+assert.sameValue(
+  trimStart.call(true),
+  'true',
+  'String.prototype.trimStart.call(true)'
+);
+
+assert.sameValue(
+  String.prototype.trimStart.call(false),
+  'false',
+  'String.prototype.trimStart.call(false)'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-line-terminator.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-line-terminator.js
new file mode 100644
index 0000000000..03b30cf6c7
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-line-terminator.js
@@ -0,0 +1,32 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: TrimStart removes all line terminators from the start of a string.
+info: |
+  Runtime Symantics: TrimString ( string, where )
+  ...
+  4. If where is "start", let T be a String value that is a copy of S with
+     trailing white space removed.
+  ...
+
+  The definition of white space is the union of WhiteSpace and LineTerminator.
+
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+var trimStart = String.prototype.trimStart;
+
+// A string of all valid LineTerminator Unicode code points
+var lt = '\u000A\u000D\u2028\u2029';
+
+var str = lt + 'a' + lt + 'b' + lt;
+var expected = 'a' + lt + 'b' + lt;
+
+assert.sameValue(
+  trimStart.call(str),
+  expected
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-not-obj-coercible.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-not-obj-coercible.js
new file mode 100644
index 0000000000..a4529c288a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-not-obj-coercible.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: The "this" value must be object-coercible
+info: |
+  1. Let O be ? RequireObjectCoercible(this value).
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+var trimStart = String.prototype.trimStart;
+
+assert.sameValue(typeof trimStart, 'function');
+
+assert.throws(TypeError, function() {
+  trimStart.call(undefined);
+}, 'undefined');
+
+assert.throws(TypeError, function() {
+  trimStart.call(null);
+}, 'null');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-number.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-number.js
new file mode 100644
index 0000000000..c7cd5f4069
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-number.js
@@ -0,0 +1,49 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: Behavoir when "this" value is a number.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  2. Let S be ? ToString(str).
+
+  ToString ( argument )
+  Argument Type: Number
+  Result: NumberToString(argument)
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+var trimStart = String.prototype.trimStart
+
+assert.sameValue(
+  trimStart.call(NaN),
+  'NaN',
+  'String.prototype.trimStart.call(NaN)'
+);
+
+assert.sameValue(
+  trimStart.call(Infinity),
+  'Infinity',
+  'String.prototype.trimStart.call(Infinity)'
+);
+
+assert.sameValue(
+  trimStart.call(-0),
+  '0',
+  'String.prototype.trimStart.call(-0)'
+);
+
+assert.sameValue(
+  trimStart.call(1),
+  '1',
+  'String.prototype.trimStart.call(1)'
+);
+
+assert.sameValue(
+  trimStart.call(-1),
+  '-1',
+  'String.prototype.trimStart.call(-1)'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-cannot-convert-to-primitive-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-cannot-convert-to-primitive-err.js
new file mode 100644
index 0000000000..4d22cc7a5e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-cannot-convert-to-primitive-err.js
@@ -0,0 +1,63 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  This value is an object which cannot be converted to a primitive
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+    6. Throw a TypeError exception.
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+assert.sameValue(typeof String.prototype.trimStart, "function");
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf: undefined,
+};
+
+// If trimStart is called on an object with neither Symbol.toPrimitive, toString
+// nor valueOf defined, then a TypeError exception should be thrown.
+assert.throws(
+  TypeError,
+  function() {
+    String.prototype.trimStart.call(thisVal);
+  }
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-call-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-call-err.js
new file mode 100644
index 0000000000..643c261e54
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-call-err.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Abrupt completion when getting Symbol.toPrimitive method
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive).
+   ...
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-err.js
new file mode 100644
index 0000000000..f876d84ee5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-err.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+    Abrupt completion when Symbol.toPrimitive abrupt completes.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive).
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+   ...
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: function() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js
new file mode 100644
index 0000000000..c21efdad18
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js
@@ -0,0 +1,82 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Priority of Symbol[toPrimitive] when converting object to string for trimming
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+   ...
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+
+var toPrimitiveAccessed = 0;
+var toStringAccessed = 0;
+var valueOfAccessed = 0;
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    toPrimitiveAccessed += 1;
+    return function() {
+      return ' 42';
+    };
+  },
+  get toString() {
+    toStringAccessed += 1;
+    return function() {
+      return '';
+    };
+  },
+  get valueOf() {
+    valueOfAccessed += 1;
+    return function() {
+      return '';
+    };
+  },
+};
+
+// Test that thisVal[Symbol.toPrimitive] has been called.
+
+var result = String.prototype.trimStart.call(thisVal);
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal[Symbol.toPrimitive] expected to have been accessed.'
+);
+assert.sameValue(
+  result,
+  '42',
+  'thisVal[Symbol.toPrimitive] expected to have been called.'
+);
+
+// Test that thisVal.toString and thisVal.valueOf have not been accessedo
+
+assert.sameValue(
+  toStringAccessed,
+  0,
+  'thisVal.toString should not have been accessed.'
+);
+assert.sameValue(
+  valueOfAccessed,
+  0,
+  'thisVal.valueOf should not have been accessed.'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-returns-object-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-returns-object-err.js
new file mode 100644
index 0000000000..383aab41f4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-returns-object-err.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+    Abrupt completion when Symbol.toPrimitive returns an object
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If arguement is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive).
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+   ...
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: function() {
+    return {};
+  },
+};
+
+assert.sameValue(typeof String.prototype.trimStart, 'function');
+assert.throws(TypeError, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-call-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-call-err.js
new file mode 100644
index 0000000000..9328faecb3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-call-err.js
@@ -0,0 +1,53 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Abrupt completion when getting toString method
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  get toString() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-meth-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-meth-err.js
new file mode 100644
index 0000000000..eb57861be9
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-meth-err.js
@@ -0,0 +1,55 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Abrupt completion when toString called and abrupt completes.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: function() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-meth-priority.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-meth-priority.js
new file mode 100644
index 0000000000..dda76b4a1f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-meth-priority.js
@@ -0,0 +1,99 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Priority of toString when converting object to string for trimming
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+   ...
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var toPrimitiveAccessed = 0;
+var toStringAccessed = 0;
+var valueOfAccessed = 0;
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    toPrimitiveAccessed += 1;
+    return undefined;
+  },
+  get toString() {
+    toStringAccessed += 1;
+    return function() {
+      return ' 42';
+    };
+  },
+  get valueOf() {
+    valueOfAccessed += 1;
+    return function() {
+      return '';
+    };
+  },
+};
+
+// Test that toString is called when Symbol.toPrimitive is undefined.
+
+var result = String.prototype.trimStart.call(thisVal)
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal.toString expected to have been accessed.'
+);
+assert.sameValue(
+  result,
+  '42',
+  'thisVal.toString expected to have been called.'
+);
+
+// Test that thisVal[toPrimitive] has been accessed.
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal[Symbol.toPrimitive should have been accessed.'
+);
+
+// Test that thisVal.valueOf has not been accessed.
+
+assert.sameValue(
+  valueOfAccessed,
+  0,
+  'thisVal.valueOf should not have been accessed.'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-returns-object-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-returns-object-err.js
new file mode 100644
index 0000000000..82c9165a52
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-tostring-returns-object-err.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Abrupt completion when toString called and returns an object
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+    6. Throw a TypeError exception.
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: function() {
+    return {};
+  },
+};
+
+assert.sameValue(typeof String.prototype.trimStart, 'function');
+assert.throws(TypeError, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-call-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-call-err.js
new file mode 100644
index 0000000000..6b839b83df
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-call-err.js
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Abrupt completion when getting valueOf method
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+features: [string-trimming, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  get valueOf() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-meth-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-meth-err.js
new file mode 100644
index 0000000000..075fb607a8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-meth-err.js
@@ -0,0 +1,56 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Abrupt completion when valueOf called and abrupt completes.
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf: function() {
+    throw new Test262Error();
+  },
+};
+
+assert.throws(Test262Error, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-meth-priority.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-meth-priority.js
new file mode 100644
index 0000000000..682578f6e4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-meth-priority.js
@@ -0,0 +1,95 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Priority of valueOf when converting object to string for trimming
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+   ...
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+var toPrimitiveAccessed = 0;
+var toStringAccessed = 0;
+var valueOfAccessed = 0;
+var thisVal = {
+  get [Symbol.toPrimitive]() {
+    toPrimitiveAccessed += 1;
+    return undefined;
+  },
+  get toString() {
+    toStringAccessed += 1;
+    return undefined;
+  },
+  get valueOf() {
+    valueOfAccessed += 1;
+    return function() {
+      return ' 42';
+    };
+  },
+};
+
+// Test that valueOf is called when Symbol.toPrimitive and toString are both
+// undefined.
+
+var result = String.prototype.trimStart.call(thisVal);
+
+assert.sameValue(
+  valueOfAccessed,
+  1,
+  'thisVal.toString expected to have been accessed.'
+);
+assert.sameValue(
+  result,
+  '42',
+  'thisVal.valueOf expected to have been called.'
+);
+
+// Test that thisVal[toPrimitive] and thisVal.toString has been accessed.
+
+assert.sameValue(
+  toPrimitiveAccessed,
+  1,
+  'thisVal[Symbol.toPrimitive should have been accessed.'
+);
+assert.sameValue(
+  toStringAccessed,
+  1,
+  'thisVal[Symbol.toString should have been accessed.'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-returns-object-err.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-returns-object-err.js
new file mode 100644
index 0000000000..9205faaddc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-valueof-returns-object-err.js
@@ -0,0 +1,60 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: >
+  Abrupt completion when valueOf called and returns an object
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  1. Let str be ? RequireObjectCoercible(string).
+  2. Let S be ? ToString(str).
+   ...
+
+  ToString ( argument )
+  If argument is Object:
+    1. Let primValue be ? ToPrimitive(argument, hint String).
+   ...
+
+  ToPrimitive ( input [, PreferredType ])
+   ...
+    b. Else if PreferredType is hint String, let hint be "string".
+   ...
+    d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
+    e. If exoticToPrim is not undefined, then
+      i. Let result be ? Call(exoticToPrim, input, « hint »).
+      ii. If Type(result) is not Object, return result.
+      iii. Throw a TypeError exception.
+    f. If hint is "default", set hint to "number".
+    g. Return ? OrdinaryToPrimitive(input, hint).
+   ...
+
+  OrdinaryToPrimitive( O, hint )
+   ...
+    3. If hint is "string", then
+      a. Let methodNames be « "toString", "valueOf" ».
+   ...
+    5. For each name in methodNames in List order, do
+      a. Let method be ? Get(O, name).
+      b. If IsCallable(method) is true, then
+        i. Let result be ? Call(method, O).
+        ii. If Type(result) is not Object, return result.
+    6. Throw a TypeError exception.
+features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive]
+---*/
+
+
+var thisVal = {
+  [Symbol.toPrimitive]: undefined,
+  toString: undefined,
+  valueOf: function() {
+    return {};
+  },
+};
+
+assert.sameValue(typeof String.prototype.trimStart, 'function');
+assert.throws(TypeError, function() {
+  String.prototype.trimStart.call(thisVal);
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-symbol-typeerror.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-symbol-typeerror.js
new file mode 100644
index 0000000000..95e3e3fa38
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-symbol-typeerror.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: Type error when "this" value is a Symbol
+info: |
+  Runtime Semantics: TrimString ( string, where )
+  2. Let S be ? ToString(str).
+
+  ToString ( argument )
+  Argument Type: Symbol
+  Result: Throw a TypeError exception
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+assert.sameValue(typeof String.prototype.trimStart, "function");
+
+var trimStart = String.prototype.trimStart;
+var symbol = Symbol();
+
+assert.throws(
+  TypeError,
+  function() {
+    trimStart.call(symbol);
+  },
+  'String.prototype.trimStart.call(Symbol())'
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-whitespace.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-whitespace.js
new file mode 100644
index 0000000000..2a83025d6c
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-whitespace.js
@@ -0,0 +1,35 @@
+// Copyright (c) 2017 Valerie Young.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.trimStart
+description: TrimStart removes all whitespace from the start of a string.
+info: |
+  Runtime Symantics: TrimString ( string, where )
+  ...
+  3. If where is "start", let T be a String value that is a copy of S with
+     trailing white space removed.
+  ...
+
+  The definition of white space is the union of WhiteSpace and LineTerminator.
+  When determining whether a Unicode code point is in Unicode general category
+  “Zs”, code unit sequences are interpreted as UTF-16 encoded code point
+  sequences as specified in 6.1.4.
+
+features: [string-trimming, String.prototype.trimStart]
+---*/
+
+var trimStart = String.prototype.trimStart;
+
+// A string of all valid WhiteSpace Unicode code points
+var wspc = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
+
+var str = wspc + 'a' + wspc + 'b' + wspc;
+var expected = 'a' + wspc + 'b' + wspc;
+
+assert.sameValue(
+  trimStart.call(str),
+  expected
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/browser.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/browser.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/length.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/length.js
new file mode 100644
index 0000000000..9655e6500f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/length.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.valueof
+description: >
+  String.prototype.valueOf.length is 0.
+info: |
+  String.prototype.valueOf ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description, including optional
+    parameters. However, rest parameters shown using the form “...name”
+    are not included in the default argument count.
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(String.prototype.valueOf, 'length', {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/name.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/name.js
new file mode 100644
index 0000000000..e5ae351739
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/name.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.valueof
+description: >
+  String.prototype.valueOf.name is "valueOf".
+info: |
+  String.prototype.valueOf ( )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+verifyProperty(String.prototype.valueOf, 'name', {
+  value: 'valueOf',
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/non-generic-realm.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/non-generic-realm.js
new file mode 100644
index 0000000000..31caef4a3a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/non-generic-realm.js
@@ -0,0 +1,60 @@
+// Copyright (C) 2019 Aleksey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.valueof
+description: >
+  Throws a TypeError if called on neither String primitive nor String object
+  (honoring the Realm of the current execution context)
+info: |
+  String.prototype.valueOf ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  [...]
+  3. Throw a TypeError exception.
+features: [cross-realm]
+---*/
+
+var other = $262.createRealm().global;
+var otherValueOf = other.String.prototype.valueOf;
+
+assert.throws(other.TypeError, function() {
+  otherValueOf.call(false);
+});
+
+assert.throws(other.TypeError, function() {
+  otherValueOf.call(-1);
+});
+
+assert.throws(other.TypeError, function() {
+  otherValueOf.call(null);
+});
+
+assert.throws(other.TypeError, function() {
+  otherValueOf.call();
+});
+
+assert.throws(other.TypeError, function() {
+  otherValueOf.call(Symbol('desc'));
+});
+
+assert.throws(other.TypeError, function() {
+  otherValueOf.call({
+    valueOf: function() {
+      return '';
+    },
+  });
+});
+
+assert.throws(other.TypeError, function() {
+  otherValueOf.call([3]);
+});
+
+assert.throws(other.TypeError, function() {
+  '' + {valueOf: otherValueOf};
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/non-generic.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/non-generic.js
new file mode 100644
index 0000000000..761655d04d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/non-generic.js
@@ -0,0 +1,57 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.valueof
+description: >
+  Throws a TypeError if called on neither String primitive nor String object
+info: |
+  String.prototype.valueOf ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  [...]
+  3. Throw a TypeError exception.
+---*/
+
+var valueOf = String.prototype.valueOf;
+
+assert.throws(TypeError, function() {
+  valueOf.call(true);
+});
+
+assert.throws(TypeError, function() {
+  valueOf.call(-0);
+});
+
+assert.throws(TypeError, function() {
+  valueOf.call(null);
+});
+
+assert.throws(TypeError, function() {
+  valueOf.call();
+});
+
+assert.throws(TypeError, function() {
+  valueOf.call(Symbol('desc'));
+});
+
+assert.throws(TypeError, function() {
+  valueOf.call({
+    toString: function() {
+      return 'str';
+    },
+  });
+});
+
+assert.throws(TypeError, function() {
+  valueOf.call(['s', 't', 'r']);
+});
+
+assert.throws(TypeError, function() {
+  'str' + {valueOf: valueOf};
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/not-a-constructor.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/not-a-constructor.js
new file mode 100644
index 0000000000..81afa416d4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/not-a-constructor.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-ecmascript-standard-built-in-objects
+description: >
+  String.prototype.valueOf does not implement [[Construct]], is not new-able
+info: |
+  ECMAScript Function Objects
+
+  Built-in function objects that are not identified as constructors do not
+  implement the [[Construct]] internal method unless otherwise specified in
+  the description of a particular function.
+
+  sec-evaluatenew
+
+  ...
+  7. If IsConstructor(constructor) is false, throw a TypeError exception.
+  ...
+includes: [isConstructor.js]
+features: [Reflect.construct, arrow-function]
+---*/
+
+assert.sameValue(
+  isConstructor(String.prototype.valueOf),
+  false,
+  'isConstructor(String.prototype.valueOf) must return false'
+);
+
+assert.throws(TypeError, () => {
+  new String.prototype.valueOf();
+}, '`new String.prototype.valueOf()` throws TypeError');
+
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/shell.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/shell.js
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/string-object.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/string-object.js
new file mode 100644
index 0000000000..68ae989392
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/string-object.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.valueof
+description: >
+  If called on a String object, returns [[StringData]] slot
+info: |
+  String.prototype.valueOf ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  [...]
+  2. If Type(value) is Object and value has a [[StringData]] internal slot, then
+    a. Let s be value.[[StringData]].
+    b. Assert: Type(s) is String.
+    c. Return s.
+---*/
+
+var valueOf = String.prototype.valueOf;
+
+assert.sameValue(Object('').valueOf(), '');
+assert.sameValue(valueOf.call(new String('str')), 'str');
+assert.sameValue('a' + new String('b'), 'ab');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/String/prototype/valueOf/string-primitive.js b/js/src/tests/test262/built-ins/String/prototype/valueOf/string-primitive.js
new file mode 100644
index 0000000000..8d951a9cfc
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/valueOf/string-primitive.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2009 the Sputnik authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.valueof
+description: >
+  If called on String primitive, returns it
+info: |
+  String.prototype.valueOf ( )
+
+  1. Return ? thisStringValue(this value).
+
+  thisStringValue ( value )
+
+  1. If Type(value) is String, return value.
+---*/
+
+var valueOf = String.prototype.valueOf;
+
+assert.sameValue('str'.valueOf(), 'str');
+assert.sameValue(valueOf.call(''), '');
+
+reportCompare(0, 0);