diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.13/11.13.2/11.13.2-28-s.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.13/11.13.2/11.13.2-28-s.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/// Copyright (c) 2012 Ecma International.  All rights reserved. 
+/// Ecma International makes this code available under the terms and conditions set
+/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
+/// "Use Terms").   Any redistribution of this code must retain the above 
+/// copyright and this notice and otherwise comply with the Use Terms.
+/**
+ * @path ch11/11.13/11.13.2/11.13.2-28-s.js
+ * @description Strict Mode - TypeError is thrown if The LeftHandSide of a Compound Assignment operator(<<=) is a reference to a data property with the attribute value {[[Writable]]:false}
+ * @onlyStrict
+ */
+
+
+function testcase() {
+        "use strict";
+        var obj = {};
+        Object.defineProperty(obj, "prop", {
+            value: 10,
+            writable: false,
+            enumerable: true,
+            configurable: true
+        });
+
+        try {
+            obj.prop <<= 20;
+            return false;
+        } catch (e) {
+            return e instanceof TypeError && obj.prop === 10;
+        }
+    }
+runTestCase(testcase);