diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.6/11.6.2/S11.6.2_A2.4_T1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.6/11.6.2/S11.6.2_A2.4_T1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * First expression is evaluated first, and then second expression
+ *
+ * @path ch11/11.6/11.6.2/S11.6.2_A2.4_T1.js
+ * @description Checking with "="
+ */
+
+//CHECK#1
+var x = 0; 
+if ((x = 1) - x !== 0) {
+  $ERROR('#1: var x = 0; (x = 1) - x === 0. Actual: ' + ((x = 1) - x));
+}
+
+//CHECK#2
+var x = 0; 
+if (x - (x = 1) !== -1) {
+  $ERROR('#2: var x = 0; x - (x = 1) === -1. Actual: ' + (x - (x = 1)));
+}
+
+