diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.6/11.6.2/S11.6.2_A3_T2.6.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.6/11.6.2/S11.6.2_A3_T2.6.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * Operator x - y returns ToNumber(x) - ToNumber(y)
+ *
+ * @path ch11/11.6/11.6.2/S11.6.2_A3_T2.6.js
+ * @description Type(x) is different from Type(y) and both types vary between String (primitive or object) and Undefined
+ */
+
+//CHECK#1
+if (isNaN("1" - undefined) !== true) {
+  $ERROR('#1: "1" - undefined === Not-a-Number. Actual: ' + ("1" - undefined));
+}
+
+//CHECK#2
+if (isNaN(undefined - "1") !== true) {
+  $ERROR('#2: undefined - "1" === Not-a-Number. Actual: ' + (undefined - "1"));
+}
+
+//CHECK#3
+if (isNaN(new String("1") - undefined) !== true) {
+  $ERROR('#3: new String("1") - undefined === Not-a-Number. Actual: ' + (new String("1") - undefined));
+}
+
+//CHECK#4
+if (isNaN(undefined - new String("1")) !== true) {
+  $ERROR('#4: undefined - new String("1") === Not-a-Number. Actual: ' + (undefined - new String("1")));
+}
+