diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.4/11.4.7/S11.4.7_A4.2.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_A4.2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * Negating +0 produces -0, negating -0 produces +0
+ *
+ * @path ch11/11.4/11.4.7/S11.4.7_A4.2.js
+ * @description Checking Infinity
+ */
+
+//CHECK#1
+var x = 0; 
+x = -x;
+if (x !== -0) {
+  $ERROR('#1.1: var x = 0; x = -x; x === 0. Actual: ' + (x));
+} else {
+  if (1/x !== Number.NEGATIVE_INFINITY) {
+    $ERROR('#1.2: var x = 0; x = -x; x === - 0. Actual: +0');
+  }
+}
+
+//CHECK#2
+var x = -0; 
+x = -x;
+if (x !== 0) {
+  $ERROR('#2.1: var x = -0; x = -x; x === 0. Actual: ' + (x));
+} else {
+  if (1/x !== Number.POSITIVE_INFINITY) {
+    $ERROR('#2.2: var x = -0; x = -x; x === + 0. Actual: -0');
+  }
+}
+
+