1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/from/Array.from_forwards-length-for-array-likes.js b/js/src/tests/test262/built-ins/Array/from/Array.from_forwards-length-for-array-likes.js
new file mode 100644
index 0000000000..8bb73635ee
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/from/Array.from_forwards-length-for-array-likes.js
@@ -0,0 +1,41 @@
+// 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.from
+description: >
+  If this is a constructor, and items doesn't have an @@iterator,
+  returns a new instance of this
+info: |
+  22.1.2.1 Array.from ( items [ , mapfn [ , thisArg ] ] )
+
+  4. Let usingIterator be GetMethod(items, @@iterator).
+  ...
+  6. If usingIterator is not undefined, then
+  ...
+  12. If IsConstructor(C) is true, then
+    a. Let A be Construct(C, «len»).
+  13. Else,
+    a. Let A be ArrayCreate(len).
+  ...
+  19. Return A.
+---*/
+
+var result;
+
+function MyCollection() {
+  this.args = arguments;
+}
+
+result = Array.from.call(MyCollection, {
+  length: 42
+});
+
+assert.sameValue(result.args.length, 1, 'The value of result.args.length is expected to be 1');
+assert.sameValue(result.args[0], 42, 'The value of result.args[0] is expected to be 42');
+assert(
+  result instanceof MyCollection,
+  'The result of evaluating (result instanceof MyCollection) is expected to be true'
+);
+
+reportCompare(0, 0);