1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/from/elements-updated-after.js b/js/src/tests/test262/built-ins/Array/from/elements-updated-after.js
new file mode 100644
index 0000000000..210aaf5fd4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/from/elements-updated-after.js
@@ -0,0 +1,29 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Elements are updated after the call to from
+esid: sec-array.from
+---*/
+
+var array = [127, 4, 8, 16, 32, 64, 128];
+var arrayIndex = -1;
+
+function mapFn(value, index) {
+  arrayIndex++;
+  if (index + 1 < array.length) {
+    array[index + 1] = 127;
+  }
+  assert.sameValue(value, 127, 'The value of value is expected to be 127');
+  assert.sameValue(index, arrayIndex, 'The value of index is expected to equal the value of arrayIndex');
+
+  return value;
+}
+
+var a = Array.from(array, 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], 127, 'The value of a[j] is expected to be 127');
+}
+
+reportCompare(0, 0);