diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.9/11.9.2/S11.9.2_A4.1_T2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.9/11.9.2/S11.9.2_A4.1_T2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * If x or y is NaN, return true
+ *
+ * @path ch11/11.9/11.9.2/S11.9.2_A4.1_T2.js
+ * @description y is NaN
+ */
+
+//CHECK#1
+if ((true != Number.NaN) !== true) {
+  $ERROR('#1: (true != NaN) === true');
+}
+
+//CHECK#2
+if ((-1 != Number.NaN) !== true) {
+  $ERROR('#2: (-1 != NaN) === true');
+}
+
+//CHECK#3
+if ((Number.NaN != Number.NaN) !== true) {
+  $ERROR('#3: (NaN != NaN) === true');
+}
+
+//CHECK#4
+if ((Number.POSITIVE_INFINITY != Number.NaN) !== true) {
+  $ERROR('#4: (+Infinity != NaN) === true');
+}
+
+//CHECK#5
+if ((Number.NEGATIVE_INFINITY != Number.NaN) !== true) {
+  $ERROR('#5: (-Infinity != NaN) === true');
+}
+
+//CHECK#6
+if ((Number.MAX_VALUE != Number.NaN) !== true) {
+  $ERROR('#6: (Number.MAX_VALUE != NaN) === true');
+}
+
+//CHECK#7
+if ((Number.MIN_VALUE != Number.NaN) !== true) {
+  $ERROR('#7: (Number.MIN_VALUE != NaN) === true');
+}
+
+//CHECK#8
+if (("string" != Number.NaN) !== true) {
+  $ERROR('#8: ("string" != NaN) === true');
+}
+
+//CHECK#9
+if ((new Object() != Number.NaN) !== true) {
+  $ERROR('#9: (new Object() != NaN) === true');
+}
+