diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.3/11.3.1/S11.3.1_A3_T4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.3/11.3.1/S11.3.1_A3_T4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * Operator x++ returns x = ToNumber(x) + 1
+ *
+ * @path ch11/11.3/11.3.1/S11.3.1_A3_T4.js
+ * @description Type(x) is undefined or null
+ */
+
+//CHECK#1
+var x; 
+x++; 
+if (isNaN(x) !== true) {
+  $ERROR('#1: var x; x++; x === Not-a-Number. Actual: ' + (x));
+}
+
+//CHECK#2
+var x = null; 
+x++; 
+if (x !== 1) {
+  $ERROR('#2: var x = null; x++; x === 1. Actual: ' + (x));
+}
+