1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-8.js b/js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-8.js
new file mode 100644
index 0000000000..135566d8a4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-8.js
@@ -0,0 +1,33 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.reduce
+description: >
+    Array.prototype.reduce - element changed by callbackfn on previous
+    iterations is observed
+---*/
+
+var result = false;
+
+function callbackfn(prevVal, curVal, idx, obj) {
+  if (idx === 0) {
+    obj[idx + 1] = 8;
+  }
+
+  if (idx === 1) {
+    result = (curVal === 8);
+  }
+}
+
+var obj = {
+  0: 11,
+  1: 12,
+  length: 2
+};
+
+Array.prototype.reduce.call(obj, callbackfn, 1);
+
+assert(result, 'result !== true');
+
+reportCompare(0, 0);