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diff --git a/js/src/tests/ecma_2/Exceptions/number-003.js b/js/src/tests/ecma_2/Exceptions/number-003.js
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+/* -*- 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:          number-003.js
+   Corresponds To:     15.7.4.3-3.js
+   ECMA Section:       15.7.4.3.1 Number.prototype.valueOf()
+   Description:
+   Returns this number value.
+
+   The valueOf 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 = "number-003";
+var VERSION = "JS1_4";
+var TITLE   = "Exceptions for Number.valueOf()";
+
+startTest();
+writeHeaderToLog( SECTION + " Number.prototype.valueOf()");
+
+var result = "Failed";
+var exception = "No exception thrown";
+var expect = "Passed";
+
+try {
+  VALUE_OF = Number.prototype.valueOf;
+  OBJECT = new String("Infinity");
+  OBJECT.valueOf = VALUE_OF;
+  result = OBJECT.valueOf();
+} catch ( e ) {
+  result = expect;
+  exception = e.toString();
+}
+
+new TestCase(
+  SECTION,
+  "Assigning Number.prototype.valueOf as the valueOf of a String object " +
+  " (threw " + exception +")",
+  expect,
+  result );
+
+test();
+