1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/from/elements-added-after.js b/js/src/tests/test262/built-ins/Array/from/elements-added-after.js
new file mode 100644
index 0000000000..7676448d32
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/from/elements-added-after.js
@@ -0,0 +1,40 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Elements added after the call to from
+esid: sec-array.from
+---*/
+
+var arrayIndex = -1;
+var originalLength = 7;
+var obj = {
+  length: originalLength,
+  0: 2,
+  1: 4,
+  2: 8,
+  3: 16,
+  4: 32,
+  5: 64,
+  6: 128
+};
+var array = [2, 4, 8, 16, 32, 64, 128];
+
+function mapFn(value, index) {
+  arrayIndex++;
+  assert.sameValue(value, obj[arrayIndex], 'The value of value is expected to equal the value of obj[arrayIndex]');
+  assert.sameValue(index, arrayIndex, 'The value of index is expected to equal the value of arrayIndex');
+  obj[originalLength + arrayIndex] = 2 * arrayIndex + 1;
+
+  return obj[arrayIndex];
+}
+
+
+var a = Array.from(obj, mapFn);
+assert.sameValue(a.length, array.length, 'The value of a.length is expected to equal the value of array.length');
+
+for (var j = 0; j < a.length; j++) {
+  assert.sameValue(a[j], array[j], 'The value of a[j] is expected to equal the value of array[j]');
+}
+
+reportCompare(0, 0);