diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.10/11.10.1/S11.10.1_A2.4_T1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.10/11.10.1/S11.10.1_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 ch11/11.10/11.10.1/S11.10.1_A2.4_T1.js
+ * @description Checking with "="
+ */
+
+//CHECK#1
+var x = 0; 
+if (((x = 1) & x) !== 1) {
+  $ERROR('#1: var x = 0; ((x = 1) & x) === 1. Actual: ' + (((x = 1) & x)));
+}
+
+//CHECK#2
+var x = 0; 
+if ((x & (x = 1)) !== 0) {
+  $ERROR('#2: var x = 0; (x & (x = 1)) === 0. Actual: ' + ((x & (x = 1))));
+}
+
+