diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.9/11.9.1/S11.9.1_A4.1_T1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.9/11.9.1/S11.9.1_A4.1_T1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+// 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 false
+ *
+ * @path ch11/11.9/11.9.1/S11.9.1_A4.1_T1.js
+ * @description x is NaN
+ */
+
+//CHECK#1
+if ((Number.NaN == true) !== false) {
+  $ERROR('#1: (NaN == true) === false');
+}
+
+//CHECK#2
+if ((Number.NaN == 1) !== false) {
+  $ERROR('#2: (NaN == 1) === false');
+}
+
+//CHECK#3
+if ((Number.NaN == Number.NaN) !== false) {
+  $ERROR('#3: (NaN == NaN) === false');
+}
+
+//CHECK#4
+if ((Number.NaN == Number.POSITIVE_INFINITY) !== false) {
+  $ERROR('#4: (NaN == +Infinity) === false');
+}
+
+//CHECK#5
+if ((Number.NaN == Number.NEGATIVE_INFINITY) !== false) {
+  $ERROR('#5: (NaN == -Infinity) === false');
+}
+
+//CHECK#6
+if ((Number.NaN == Number.MAX_VALUE) !== false) {
+  $ERROR('#6: (NaN == Number.MAX_VALUE) === false');
+}
+
+//CHECK#7
+if ((Number.NaN == Number.MIN_VALUE) !== false) {
+  $ERROR('#7: (NaN == Number.MIN_VALUE) === false');
+}
+
+//CHECK#8
+if ((Number.NaN == "string") !== false) {
+  $ERROR('#8: (NaN == "string") === false');
+}
+
+//CHECK#9
+if ((Number.NaN == new Object()) !== false) {
+  $ERROR('#9: (NaN == new Object()) === false');
+}
+
+