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diff --git a/js/src/tests/ecma/String/15.5.4.9-1.js b/js/src/tests/ecma/String/15.5.4.9-1.js
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+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 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:          15.5.4.9-1.js
+   ECMA Section:       15.5.4.9 String.prototype.substring( start )
+   Description:
+
+   15.5.4.9 String.prototype.substring(start)
+
+   Returns a substring of the result of converting this object to a string,
+   starting from character position start and running to the end of the
+   string. The result is a string value, not a String object.
+
+   If the argument is NaN or negative, it is replaced with zero; if the
+   argument is larger than the length of the string, it is replaced with the
+   length of the string.
+
+   When the substring method is called with one argument start, the following
+   steps are taken:
+
+   1.Call ToString, giving it the this value as its argument.
+   2.Call ToInteger(start).
+   3.Compute the number of characters in Result(1).
+   4.Compute min(max(Result(2), 0), Result(3)).
+   5.Return a string whose length is the difference between Result(3) and Result(4),
+   containing characters from Result(1), namely the characters with indices Result(4)
+   through Result(3)1, in ascending order.
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+
+var SECTION = "15.5.4.9-1";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "String.prototype.substring( start )";
+
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+new TestCase( SECTION,  "String.prototype.substring.length",        2,          String.prototype.substring.length );
+
+// test cases for when substring is called with no arguments.
+
+// this is a string object
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); typeof s.substring()",
+		"string",
+		eval("var s = new String('this is a string object'); typeof s.substring()") );
+
+new TestCase(   SECTION,
+		"var s = new String(''); s.substring()",
+		"",
+		eval("var s = new String(''); s.substring()") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring()",
+		"this is a string object",
+		eval("var s = new String('this is a string object'); s.substring()") );
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(NaN)",
+		"this is a string object",
+		eval("var s = new String('this is a string object'); s.substring(NaN)") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(-0.01)",
+		"this is a string object",
+		eval("var s = new String('this is a string object'); s.substring(-0.01)") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(s.length)",
+		"",
+		eval("var s = new String('this is a string object'); s.substring(s.length)") );
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(s.length+1)",
+		"",
+		eval("var s = new String('this is a string object'); s.substring(s.length+1)") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(Infinity)",
+		"",
+		eval("var s = new String('this is a string object'); s.substring(Infinity)") );
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(-Infinity)",
+		"this is a string object",
+		eval("var s = new String('this is a string object'); s.substring(-Infinity)") );
+
+// this is not a String object, start is not an integer
+
+
+new TestCase(   SECTION,
+		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring()",
+		"1,2,3,4,5",
+		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring()") );
+
+new TestCase(   SECTION,
+		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true)",
+		",2,3,4,5",
+		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true)") );
+
+new TestCase(   SECTION,
+		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4')",
+		"3,4,5",
+		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4')") );
+
+new TestCase(   SECTION,
+		"var s = new Array(); s.substring = String.prototype.substring; s.substring('4')",
+		"",
+		eval("var s = new Array(); s.substring = String.prototype.substring; s.substring('4')") );
+
+// this is an object object
+new TestCase(   SECTION,
+		"var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8)",
+		"Object]",
+		eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8)") );
+
+// this is a function object
+new TestCase(   SECTION,
+		"var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8)",
+		"Function]",
+		eval("var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8)") );
+// this is a number object
+new TestCase(   SECTION,
+		"var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(false)",
+		"NaN",
+		eval("var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(false)") );
+
+// this is the Math object
+new TestCase(   SECTION,
+		"var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI)",
+		"ject Math]",
+		eval("var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI)") );
+
+// this is a Boolean object
+
+new TestCase(   SECTION,
+		"var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array())",
+		"false",
+		eval("var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array())") );
+
+// this is a user defined object
+
+new TestCase( SECTION,
+	      "var obj = new MyObject( null ); obj.substring(0)",
+	      "null",
+	      eval( "var obj = new MyObject( null ); obj.substring(0)") );
+
+
+test();
+
+function MyObject( value ) {
+  this.value = value;
+  this.substring = String.prototype.substring;
+  this.toString = new Function ( "return this.value+''" );
+}