1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/copyWithin/undefined-end.js b/js/src/tests/test262/built-ins/Array/prototype/copyWithin/undefined-end.js
new file mode 100644
index 0000000000..ae2f4e3256
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/copyWithin/undefined-end.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.
+/*---
+esid: sec-array.prototype.copywithin
+description: >
+  If `end` is undefined, set final position to `this.length`.
+info: |
+  22.1.3.3 Array.prototype.copyWithin (target, start [ , end ] )
+
+  ...
+  11. If end is undefined, let relativeEnd be len; else let relativeEnd be
+  ToInteger(end).
+  ...
+includes: [compareArray.js]
+---*/
+
+assert.compareArray(
+  [0, 1, 2, 3].copyWithin(0, 1, undefined), [1, 2, 3, 3],
+  '[0, 1, 2, 3].copyWithin(0, 1, undefined) must return [1, 2, 3, 3]'
+);
+
+assert.compareArray(
+  [0, 1, 2, 3].copyWithin(0, 1), [1, 2, 3, 3],
+  '[0, 1, 2, 3].copyWithin(0, 1) must return [1, 2, 3, 3]'
+);
+
+reportCompare(0, 0);