1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_spreadable-string-wrapper.js b/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_spreadable-string-wrapper.js
new file mode 100644
index 0000000000..e44fbc769a
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_spreadable-string-wrapper.js
@@ -0,0 +1,34 @@
+// 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 Symbol.isConcatSpreadable string wrapper
+includes: [compareArray.js]
+features: [Symbol.isConcatSpreadable]
+---*/
+var str1 = new String("yuck\uD83D\uDCA9")
+// String wrapper objects are not concat-spreadable by default
+assert.compareArray([str1], [].concat(str1), '[str1] must return the same value returned by [].concat(str1)');
+
+// String wrapper objects may be individually concat-spreadable
+str1[Symbol.isConcatSpreadable] = true;
+assert.compareArray(["y", "u", "c", "k", "\uD83D", "\uDCA9"], [].concat(str1),
+  '["y", "u", "c", "k", "uD83D", "uDCA9"] must return the same value returned by [].concat(str1)'
+);
+
+String.prototype[Symbol.isConcatSpreadable] = true;
+// String wrapper objects may be concat-spreadable
+assert.compareArray(["y", "u", "c", "k", "\uD83D", "\uDCA9"], [].concat(new String("yuck\uD83D\uDCA9")),
+  '["y", "u", "c", "k", "uD83D", "uDCA9"] must return the same value returned by [].concat(new String("yuckuD83DuDCA9"))'
+);
+
+// String values are never concat-spreadable
+assert.compareArray(["yuck\uD83D\uDCA9"], [].concat("yuck\uD83D\uDCA9"),
+  '["yuckuD83DuDCA9"] must return the same value returned by [].concat("yuckuD83DuDCA9")'
+);
+delete String.prototype[Symbol.isConcatSpreadable];
+
+reportCompare(0, 0);