1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_sloppy-arguments-with-dupes.js b/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_sloppy-arguments-with-dupes.js
new file mode 100644
index 0000000000..36af587993
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_sloppy-arguments-with-dupes.js
@@ -0,0 +1,28 @@
+// Copyright (c) 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/*---
+esid: sec-array.prototype.concat
+description: Array.prototype.concat sloppy arguments with dupes
+flags: [noStrict]
+includes: [compareArray.js]
+features: [Symbol.isConcatSpreadable]
+---*/
+var args = (function(a, a, a) {
+  return arguments;
+})(1, 2, 3);
+args[Symbol.isConcatSpreadable] = true;
+assert.compareArray([].concat(args, args), [1, 2, 3, 1, 2, 3],
+  '[].concat((function(a, a, a) {return arguments;})(1, 2, 3), (function(a, a, a) {return arguments;})(1, 2, 3)) must return [1, 2, 3, 1, 2, 3]'
+);
+
+Object.defineProperty(args, "length", {
+  value: 6
+});
+assert.compareArray([].concat(args), [1, 2, 3, void 0, void 0, void 0],
+  '[].concat((function(a, a, a) {return arguments;})(1, 2, 3)) must return [1, 2, 3, void 0, void 0, void 0]'
+);
+
+reportCompare(0, 0);