diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.6/11.6.1/S11.6.1_A4_T2.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_T2.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.
+
+/**
+ * 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_T2.js
+ * @description The sum of two infinities of opposite sign is NaN
+ */
+
+//CHECK#1
+if (isNaN(Number.POSITIVE_INFINITY + Number.NEGATIVE_INFINITY) !== true ) {
+  $ERROR('#1: Infinity + -Infinity === Not-a-Number. Actual: ' + (Infinity + -Infinity));
+}
+
+//CHECK#2
+if (isNaN(Number.NEGATIVE_INFINITY + Number.POSITIVE_INFINITY) !== true ) {
+  $ERROR('#2: -Infinity + Infinity === Not-a-Number. Actual: ' + (-Infinity + Infinity));
+}
+
+
+
+