diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma/Number/15.7.4.2-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma/Number/15.7.4.2-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,77 @@
+/* -*- 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:          15.7.4.2.js
+   ECMA Section:       15.7.4.2.1 Number.prototype.toString()
+   Description:
+   If the radix is the number 10 or not supplied, then this number value is
+   given as an argument to the ToString operator; the resulting string value
+   is returned.
+
+   If the radix is supplied and is an integer from 2 to 36, but not 10, the
+   result is a string, the choice of which is implementation dependent.
+
+   The toString function is not generic; it generates a runtime error if its
+   this value is not a Number object. Therefore it cannot be transferred to
+   other kinds of objects for use as a method.
+
+   Author:             christine@netscape.com
+   Date:               16 september 1997
+*/
+var SECTION = "15.7.4.2-1";
+var VERSION = "ECMA_1";
+startTest();
+
+writeHeaderToLog( SECTION + " Number.prototype.toString()");
+
+//  the following two lines cause navigator to crash -- cmb 9/16/97
+new TestCase(SECTION,
+	     "Number.prototype.toString()",      
+	     "0",       
+	     eval("Number.prototype.toString()") );
+
+new TestCase(SECTION,
+	     "typeof(Number.prototype.toString())",
+	     "string",     
+	     eval("typeof(Number.prototype.toString())") );
+
+new TestCase(SECTION, 
+	     "s = Number.prototype.toString; o = new Number(); o.toString = s; o.toString()", 
+	     "0",         
+	     eval("s = Number.prototype.toString; o = new Number(); o.toString = s; o.toString()") );
+
+new TestCase(SECTION, 
+	     "s = Number.prototype.toString; o = new Number(1); o.toString = s; o.toString()",
+	     "1",         
+	     eval("s = Number.prototype.toString; o = new Number(1); o.toString = s; o.toString()") );
+
+new TestCase(SECTION, 
+	     "s = Number.prototype.toString; o = new Number(-1); o.toString = s; o.toString()",
+	     "-1",        
+	     eval("s = Number.prototype.toString; o = new Number(-1); o.toString = s; o.toString()") );
+
+new TestCase(SECTION,
+	     "var MYNUM = new Number(255); MYNUM.toString(10)",         
+	     "255",     
+	     eval("var MYNUM = new Number(255); MYNUM.toString(10)") );
+
+new TestCase(SECTION,
+	     "var MYNUM = new Number(Number.NaN); MYNUM.toString(10)",  
+	     "NaN",     
+	     eval("var MYNUM = new Number(Number.NaN); MYNUM.toString(10)") );
+
+new TestCase(SECTION,
+	     "var MYNUM = new Number(Infinity); MYNUM.toString(10)",  
+	     "Infinity",  
+	     eval("var MYNUM = new Number(Infinity); MYNUM.toString(10)") );
+
+new TestCase(SECTION,
+	     "var MYNUM = new Number(-Infinity); MYNUM.toString(10)",  
+	     "-Infinity",
+	     eval("var MYNUM = new Number(-Infinity); MYNUM.toString(10)") );
+
+test();