1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/lastIndexOf/get-length-uses-internal-arraylength.js b/js/src/tests/test262/built-ins/TypedArray/prototype/lastIndexOf/get-length-uses-internal-arraylength.js
new file mode 100644
index 0000000000..3c20d9e937
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+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/lastIndexOf/get-length-uses-internal-arraylength.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-%typedarray%.prototype.lastindexof
+description: Get "length" uses internal ArrayLength
+info: |
+  22.2.3.17 %TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
+
+  %TypedArray%.prototype.lastIndexOf is a distinct function that implements the
+  same algorithm as Array.prototype.lastIndexOf as defined in 22.1.3.15 except
+  that the this object's [[ArrayLength]] internal slot is accessed in place of
+  performing a [[Get]] of "length".
+
+  22.1.3.15 Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
+
+  ...
+  2. Let len be ? ToLength(? Get(O, "length")).
+  ...
+includes: [testTypedArray.js]
+features: [TypedArray]
+---*/
+
+Object.defineProperty(TypedArray.prototype, "length", {value: 0});
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample = new TA([7]);
+
+  Object.defineProperty(TA.prototype, "length", {value: 0});
+  Object.defineProperty(sample, "length", {value: 0});
+
+  assert.sameValue(sample.lastIndexOf(7), 0);
+});
+
+reportCompare(0, 0);