diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.8/11.8.7/S11.8.7_A4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.8/11.8.7/S11.8.7_A4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * Operator "in" calls ToString(ShiftExpression)
+ *
+ * @path ch11/11.8/11.8.7/S11.8.7_A4.js
+ * @description Checking ToString coversion;
+ */
+
+//CHECK#1
+var object = {};
+object["true"] = 1;
+if (true in object !== "true" in object) {  
+  $ERROR('#1: "var object = {}; object["true"] = 1; true in object === "true" in object');  
+}
+
+//CHECK#2
+var object = {};
+object.Infinity = 1;
+if (Infinity in object !== "Infinity" in object) {  
+  $ERROR('#2: "var object = {}; object.Infinity = 1; Infinity in object === "Infinity" in object');  
+}
+
+//CHECK#4
+var object = {};
+object.undefined = 1;
+if (undefined in object !== "undefined" in object) {  
+  $ERROR('#4: "var object = {}; object.undefined = 1; undefined in object === "undefined" in object');  
+}
+
+//CHECK#5
+var object = {};
+object["null"] = 1;
+if (null in object !== "null" in object) {  
+  $ERROR('#5: "var object = {}; object["null"] = 1; null in object === "null" in object');  
+}
+