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diff --git a/js/src/tests/ecma/Number/15.7.3.1-2.js b/js/src/tests/ecma/Number/15.7.3.1-2.js
new file mode 100644
index 000000000..51e53a04f
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+++ b/js/src/tests/ecma/Number/15.7.3.1-2.js
@@ -0,0 +1,37 @@
+/* -*- 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:          15.7.3.1-2.js
+   ECMA Section:       15.7.3.1 Number.prototype
+   Description:        All value properties of the Number object should have
+   the attributes [DontEnum, DontDelete, ReadOnly]
+
+   this test checks the ReadOnly attribute of Number.prototype
+
+   Author:             christine@netscape.com
+   Date:               16 september 1997
+*/
+
+
+var SECTION = "15.7.3.1-2";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "Number.prototype";
+
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+new TestCase(   SECTION,
+		"var NUM_PROT = Number.prototype; Number.prototype = null; Number.prototype == NUM_PROT",
+		true,
+		eval("var NUM_PROT = Number.prototype; Number.prototype = null; Number.prototype == NUM_PROT") );
+
+new TestCase(   SECTION,
+		"Number.prototype=0; Number.prototype",
+		Number.prototype,
+		eval("Number.prototype=0; Number.prototype") );
+
+test();