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diff --git a/js/src/tests/ecma/String/15.5.4.10-1.js b/js/src/tests/ecma/String/15.5.4.10-1.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:          15.5.4.10-1.js
+   ECMA Section:       15.5.4.10 String.prototype.substring( start, end )
+   Description:
+
+   15.5.4.10 String.prototype.substring(start, end)
+
+   Returns a substring of the result of converting this object to a string,
+   starting from character position start and running to character position
+   end of the string. The result is a string value, not a String object.
+
+   If either argument is NaN or negative, it is replaced with zero; if either
+   argument is larger than the length of the string, it is replaced with the
+   length of the string.
+
+   If start is larger than end, they are swapped.
+
+   When the substring method is called with two arguments start and end, the
+   following steps are taken:
+
+   1.  Call ToString, giving it the this value as its argument.
+   2.  Call ToInteger(start).
+   3.  Call ToInteger (end).
+   4.  Compute the number of characters in Result(1).
+   5.  Compute min(max(Result(2), 0), Result(4)).
+   6.  Compute min(max(Result(3), 0), Result(4)).
+   7.  Compute min(Result(5), Result(6)).
+   8.  Compute max(Result(5), Result(6)).
+   9.  Return a string whose length is the difference between Result(8) and
+   Result(7), containing characters from Result(1), namely the characters
+   with indices Result(7) through Result(8)1, in ascending order.
+
+   Note that the substring function is intentionally generic; it does not require
+   that its this value be a String object. Therefore it can be transferred to other
+   kinds of objects for use as a method.
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+
+var SECTION = "15.5.4.10-1";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "String.prototype.substring( start, end )";
+
+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(1,0)",
+		"",
+		eval("var s = new String(''); s.substring(1,0)") );
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(true, false)",
+		"t",
+		eval("var s = new String('this is a string object'); s.substring(false, true)") );
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(NaN, Infinity)",
+		"this is a string object",
+		eval("var s = new String('this is a string object'); s.substring(NaN, Infinity)") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(Infinity, NaN)",
+		"this is a string object",
+		eval("var s = new String('this is a string object'); s.substring(Infinity, NaN)") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(Infinity, Infinity)",
+		"",
+		eval("var s = new String('this is a string object'); s.substring(Infinity, Infinity)") );
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(-0.01, 0)",
+		"",
+		eval("var s = new String('this is a string object'); s.substring(-0.01,0)") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(s.length, s.length)",
+		"",
+		eval("var s = new String('this is a string object'); s.substring(s.length, s.length)") );
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(s.length+1, 0)",
+		"this is a string object",
+		eval("var s = new String('this is a string object'); s.substring(s.length+1, 0)") );
+
+
+new TestCase(   SECTION,
+		"var s = new String('this is a string object'); s.substring(-Infinity, -Infinity)",
+		"",
+		eval("var s = new String('this is a string object'); s.substring(-Infinity, -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(Infinity,-Infinity)",
+		"1,2,3,4,5",
+		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(Infinity,-Infinity)") );
+
+new TestCase(   SECTION,
+		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true, false)",
+		"1",
+		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring(true, false)") );
+
+new TestCase(   SECTION,
+		"var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4', '5')",
+		"3",
+		eval("var s = new Array(1,2,3,4,5); s.substring = String.prototype.substring; s.substring('4', '5')") );
+
+
+// this is an object object
+new TestCase(   SECTION,
+		"var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,0)",
+		"[object ",
+		eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,0)") );
+
+new TestCase(   SECTION,
+		"var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8,obj.toString().length)",
+		"Object]",
+		eval("var obj = new Object(); obj.substring = String.prototype.substring; obj.substring(8, obj.toString().length)") );
+
+// 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, Infinity)",
+		"Function]",
+		eval("var obj = new Function(); obj.substring = String.prototype.substring; obj.toString = Object.prototype.toString; obj.substring(8,Infinity)") );
+// this is a number object
+new TestCase(   SECTION,
+		"var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(Infinity, NaN)",
+		"NaN",
+		eval("var obj = new Number(NaN); obj.substring = String.prototype.substring; obj.substring(Infinity, NaN)") );
+
+// this is the Math object
+new TestCase(   SECTION,
+		"var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI, -10)",
+		"[ob",
+		eval("var obj = Math; obj.substring = String.prototype.substring; obj.substring(Math.PI, -10)") );
+
+// this is a Boolean object
+
+new TestCase(   SECTION,
+		"var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array(), new Boolean(1))",
+		"f",
+		eval("var obj = new Boolean(); obj.substring = String.prototype.substring; obj.substring(new Array(), new Boolean(1))") );
+
+// this is a user defined object
+
+new TestCase( SECTION,
+	      "var obj = new MyObject( void 0 ); obj.substring(0, 100)",
+	      "undefined",
+	      eval( "var obj = new MyObject( void 0 ); obj.substring(0,100)") );
+
+test();
+
+function MyObject( value ) {
+  this.value = value;
+  this.substring = String.prototype.substring;
+  this.toString = new Function ( "return this.value+''" );
+}