1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_spreadable-sparse-object.js b/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_spreadable-sparse-object.js
new file mode 100644
index 0000000000..1ede626d06
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/concat/Array.prototype.concat_spreadable-sparse-object.js
@@ -0,0 +1,25 @@
+// 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 sparse object
+includes: [compareArray.js]
+features: [Symbol.isConcatSpreadable]
+---*/
+var obj = {
+  length: 5
+};
+obj[Symbol.isConcatSpreadable] = true;
+assert.compareArray([void 0, void 0, void 0, void 0, void 0], [].concat(obj),
+  '[void 0, void 0, void 0, void 0, void 0] must return the same value returned by [].concat(obj)'
+);
+
+obj.length = 4000;
+assert.compareArray(new Array(4000), [].concat(obj),
+  'new Array(4000) must return the same value returned by [].concat(obj)'
+);
+
+reportCompare(0, 0);