diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.4/11.4.7/S11.4.7_A3_T4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.4/11.4.7/S11.4.7_A3_T4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * Operator -x returns -ToNumber(x)
+ *
+ * @path ch11/11.4/11.4.7/S11.4.7_A3_T4.js
+ * @description Type(x) is undefined or null
+ */
+
+//CHECK#1
+if (isNaN(-void 0) !== true) {
+  $ERROR('#1: +void 0 === Not-a-Number. Actual: ' + (+void 0));
+}
+
+//CHECK#2
+if (-null !== 0) {
+  $ERROR('#2: +null === 0. Actual: ' + (+null));
+}
+