1 files changed, 285 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/findLast_findLastIndex.js b/js/src/tests/non262/Array/findLast_findLastIndex.js
new file mode 100644
index 0000000000..00f5640308
--- /dev/null
+++ b/js/src/tests/non262/Array/findLast_findLastIndex.js
@@ -0,0 +1,285 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1704385;
+var summary = 'Array.prototype.findLast and Array.prototype.findLastIndex';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function isString(v, index, array)
+{
+  assertEq(array[index], v);
+  return typeof v == 'string';
+}
+
+function dumpError(e)
+{
+  var s = e.name + ': ' + e.message +
+    ' File: ' + e.fileName +
+    ', Line: ' + e.lineNumber +
+    ', Stack: ' + e.stack;
+  return s;
+}
+
+var expect;
+var actual;
+var obj;
+
+var strings = ['hello', 'Array', 'WORLD'];
+var mixed   = [0, '1', 2];
+var sparsestrings = new Array();
+sparsestrings[2] = 'sparse';
+var arraylike = {0:0, 1:'string', 2:2, length:3};
+// array for which JSObject::isIndexed() holds.
+var indexedArray = [];
+Object.defineProperty(indexedArray, 42, { get: function() { return 42; } });
+Object.defineProperty(indexedArray, 142, { get: function() { return 'string'; } });
+
+// findLast and findLastIndex have 1 required argument
+
+expect = 1;
+actual = Array.prototype.findLast.length;
+reportCompare(expect, actual, 'Array.prototype.findLast.length == 1');
+actual = Array.prototype.findLastIndex.length;
+reportCompare(expect, actual, 'Array.prototype.findLastIndex.length == 1');
+
+// throw TypeError if no predicate specified
+expect = 'TypeError';
+try
+{
+  strings.findLast();
+  actual = 'no error';
+}
+catch(e)
+{
+  actual = e.name;
+}
+reportCompare(expect, actual, 'Array.findLast(undefined) throws TypeError');
+try
+{
+  strings.findLastIndex();
+  actual = 'no error';
+}
+catch(e)
+{
+  actual = e.name;
+}
+reportCompare(expect, actual, 'Array.findLastIndex(undefined) throws TypeError');
+
+// Length gets treated as integer, not uint32
+obj = { length: -4294967295, 0: 42 };
+expected = undefined;
+actual = Array.prototype.findLast.call(obj, () => true);
+reportCompare(expected, actual, 'findLast correctly treats "length" as an integer');
+expected = -1
+actual = Array.prototype.findLastIndex.call(obj, () => true);
+reportCompare(expected, actual, 'findLastIndex correctly treats "length" as an integer');
+
+// test findLast and findLastIndex results
+try
+{
+  expect = 'WORLD';
+  actual = strings.findLast(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'strings: findLast finds last string element');
+
+try
+{
+  expect = 2;
+  actual = strings.findLastIndex(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'strings: findLastIndex finds last string element');
+
+try
+{
+  expect = '1';
+  actual = mixed.findLast(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'mixed: findLast finds last string element');
+
+try
+{
+  expect = 1;
+  actual = mixed.findLastIndex(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'mixed: findLastIndex finds last string element');
+
+try
+{
+  expect = 'sparse';
+  actual = sparsestrings.findLast(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'sparsestrings: findLast finds last string element');
+
+try
+{
+  expect = 2;
+  actual = sparsestrings.findLastIndex(isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'sparsestrings: findLastIndex finds first string element');
+
+try
+{
+  expect = 'string';
+  actual = [].findLast.call(arraylike, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'arraylike: findLast finds last string element');
+
+try
+{
+  expect = 1;
+  actual = [].findLastIndex.call(arraylike, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'arraylike: findLastIndex finds last string element');
+
+try
+{
+  expect = 1;
+  actual = 0;
+  Array.prototype.findLast.call({get 0(){ actual++ }, length: 1}, ()=>true);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'arraylike with getter: getter only called once');
+
+try
+{
+  expect = 'string';
+  actual = [].findLast.call(indexedArray, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'indexedArray: findLast finds last string element');
+
+try
+{
+  expect = 142;
+  actual = [].findLastIndex.call(indexedArray, isString);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, 'indexedArray: findLastIndex finds last string element');
+
+// Bug 1058394 - Array#findLast and Array#findLastIndex no longer skip holes too.
+var sparseArray = [1,,];
+var sparseArrayWithInheritedDataProperty = Object.setPrototypeOf([1,,,], {
+  __proto__: [].__proto__,
+  2 : 0
+});
+var sparseArrayWithInheritedAccessorProperty = Object.setPrototypeOf([1,,,], {
+  __proto__: [].__proto__,
+  get 2(){
+    throw "get 2";
+  }
+});
+
+try
+{
+  expect = undefined;
+  actual = sparseArray.findLast(() => true);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, "Don't skip holes in Array#findLast.");
+
+try
+{
+  expect = 1;
+  actual = sparseArray.findLastIndex(() => true);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, "Don't skip holes in Array#findLastIndex.");
+
+try
+{
+  expect = 0;
+  actual = sparseArrayWithInheritedDataProperty.findLast(v => v === 0);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, "Array#findLast can find inherited data property.");
+
+try
+{
+  expect = 2;
+  actual = sparseArrayWithInheritedDataProperty.findLastIndex(v => v === 0);
+}
+catch(e)
+{
+  actual = dumpError(e);
+}
+reportCompare(expect, actual, "Array#findLastIndex can find inherited data property.");
+
+try
+{
+  expect = "get 2";
+  actual = sparseArrayWithInheritedAccessorProperty.findLast(() => true);
+}
+catch(e)
+{
+  actual = e;
+}
+reportCompare(expect, actual, "Array#findLast can find inherited accessor property.");
+
+try
+{
+  expect = "get 2";
+  actual = sparseArrayWithInheritedAccessorProperty.findLastIndex(() => true);
+}
+catch(e)
+{
+  actual = e;
+}
+reportCompare(expect, actual, "Array#findLastIndex can find inherited accessor property.");