1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/join/get-length-uses-internal-arraylength.js b/js/src/tests/test262/built-ins/TypedArray/prototype/join/get-length-uses-internal-arraylength.js
new file mode 100644
index 0000000000..95b4bac090
--- /dev/null
+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/join/get-length-uses-internal-arraylength.js
@@ -0,0 +1,47 @@
+// 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-%typedarray%.prototype.join
+description: Get "length" uses internal ArrayLength
+info: |
+  22.2.3.15 %TypedArray%.prototype.join ( separator )
+
+  %TypedArray%.prototype.join is a distinct function that implements the same
+  algorithm as Array.prototype.join as defined in 22.1.3.13 except that the this
+  object's [[ArrayLength]] internal slot is accessed in place of performing a
+  [[Get]] of "length".
+
+  22.1.3.13 Array.prototype.join (separator)
+
+  1. Let O be ? ToObject(this value).
+  2. Let len be ? ToLength(? Get(O, "length")).
+  ...
+  5. If len is zero, return the empty String.
+  ...
+includes: [testTypedArray.js]
+features: [TypedArray]
+---*/
+
+var getCalls = 0;
+var desc = {
+  get: function getLen() {
+    getCalls++;
+    return 0;
+  }
+};
+
+Object.defineProperty(TypedArray.prototype, "length", desc);
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample = new TA([42, 43]);
+
+  Object.defineProperty(TA.prototype, "length", desc);
+  Object.defineProperty(sample, "length", desc);
+
+  var result = sample.join();
+
+  assert.sameValue(getCalls, 0, "ignores length properties");
+  assert.notSameValue(result, "", "result is not affected but custom length 0");
+});
+
+reportCompare(0, 0);