diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.6/11.6.1/S11.6.1_A4_T9.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.6/11.6.1/S11.6.1_A4_T9.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * The result of an addition is determined using the rules of IEEE 754 double-precision arithmetics
+ *
+ * @path ch11/11.6/11.6.1/S11.6.1_A4_T9.js
+ * @description The addition operator is not always associative ( x + y + z is the same (x + y) + z, not x + (y + z))
+ */
+
+//CHECK#1
+if (-Number.MAX_VALUE + Number.MAX_VALUE + Number.MAX_VALUE !== (-Number.MAX_VALUE + Number.MAX_VALUE) + Number.MAX_VALUE) {
+  $ERROR('#1: -Number.MAX_VALUE + Number.MAX_VALUE + Number.MAX_VALUE === (-Number.MAX_VALUE + Number.MAX_VALUE) + Number.MAX_VALUE. Actual: ' + (-Number.MAX_VALUE + Number.MAX_VALUE + Number.MAX_VALUE));
+} 
+
+//CHECK#2
+if ((-Number.MAX_VALUE + Number.MAX_VALUE) + Number.MAX_VALUE === -Number.MAX_VALUE + (Number.MAX_VALUE + Number.MAX_VALUE)) {
+  $ERROR('#2: (-Number.MAX_VALUE + Number.MAX_VALUE) + Number.MAX_VALUE === -Number.MAX_VALUE + (Number.MAX_VALUE + Number.MAX_VALUE). Actual: ' + ((-Number.MAX_VALUE + Number.MAX_VALUE) + Number.MAX_VALUE));
+}
+
+//CHECK#3
+if ("1" + 1 + 1 !== ("1" + 1) + 1) {
+  $ERROR('#3: "1" + 1 + 1 === ("1" + 1) + 1. Actual: ' + ("1" + 1 + 1));
+} 
+
+//CHECK#4
+if (("1" + 1) + 1 === "1" + (1 + 1)) {
+  $ERROR('#4: ("1" + 1) + 1 !== "1" + (1 + 1)');
+}
+