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diff --git a/js/src/tests/ecma/Number/15.7.4.3-3-n.js b/js/src/tests/ecma/Number/15.7.4.3-3-n.js
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+++ b/js/src/tests/ecma/Number/15.7.4.3-3-n.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: 15.7.4.3-3.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 = "15.7.4.3-3-n";
+var VERSION = "ECMA_1";
+startTest();
+
+writeHeaderToLog( SECTION + " Number.prototype.valueOf()");
+
+// new TestCase("15.7.4.1", "v = Number.prototype.valueOf; num = 3; num.valueOf = v; num.valueOf()", "error", eval("v = Number.prototype.valueOf; num = 3; num.valueOf = v; num.valueOf()") );
+
+DESCRIPTION = "v = Number.prototype.valueOf; o = new String('Infinity'); o.valueOf = v; o.valueOf()";
+EXPECTED = "error";
+
+new TestCase("15.7.4.1",
+ "v = Number.prototype.valueOf; o = new String('Infinity'); o.valueOf = v; o.valueOf()",
+ "error",
+ eval("v = Number.prototype.valueOf; o = new String('Infinity'); o.valueOf = v; o.valueOf()") );
+
+// new TestCase("15.7.4.1", "v = Number.prototype.valueOf; o = new Object(); o.valueOf = v; o.valueOf()", "error", eval("v = Number.prototype.valueOf; o = new Object(); o.valueOf = v; o.valueOf()") );
+
+test();