diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma/String/15.5.4.2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma/String/15.5.4.2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+   File Name:          15.5.4.2.js
+   ECMA Section:       15.5.4.2 String.prototype.toString
+
+   Description:
+   Author:             christine@netscape.com
+   Date:               28 october 1997
+
+*/
+var SECTION = "15.5.4.2";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "String.prototype.tostring";
+
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+new TestCase(   SECTION,
+		"String.prototype.toString() == String.prototype.valueOf()",
+		true,
+		String.prototype.toString() == String.prototype.valueOf() );
+
+new TestCase(   SECTION, "String.prototype.toString()",     "",     String.prototype.toString() );
+new TestCase(   SECTION, "String.prototype.toString.length",    0,  String.prototype.toString.length );
+
+
+new TestCase(   SECTION,
+		"TESTSTRING = new String();TESTSTRING.valueOf() == TESTSTRING.toString()",
+		true,
+		eval("TESTSTRING = new String();TESTSTRING.valueOf() == TESTSTRING.toString()") );
+new TestCase(   SECTION,
+		"TESTSTRING = new String(true);TESTSTRING.valueOf() == TESTSTRING.toString()",
+		true,
+		eval("TESTSTRING = new String(true);TESTSTRING.valueOf() == TESTSTRING.toString()") );
+new TestCase(   SECTION,
+		"TESTSTRING = new String(false);TESTSTRING.valueOf() == TESTSTRING.toString()",
+		true,
+		eval("TESTSTRING = new String(false);TESTSTRING.valueOf() == TESTSTRING.toString()") );
+new TestCase(   SECTION,
+		"TESTSTRING = new String(Math.PI);TESTSTRING.valueOf() == TESTSTRING.toString()",
+		true,
+		eval("TESTSTRING = new String(Math.PI);TESTSTRING.valueOf() == TESTSTRING.toString()") );
+new TestCase(   SECTION,
+		"TESTSTRING = new String();TESTSTRING.valueOf() == TESTSTRING.toString()",
+		true,
+		eval("TESTSTRING = new String();TESTSTRING.valueOf() == TESTSTRING.toString()") );
+
+test();