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diff --git a/js/src/tests/ecma/Number/15.7.3.4-2.js b/js/src/tests/ecma/Number/15.7.3.4-2.js
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+++ b/js/src/tests/ecma/Number/15.7.3.4-2.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:          15.7.3.4-2.js
+   ECMA Section:       15.7.3.4 Number.NaN
+   Description:        All value properties of the Number object should have
+   the attributes [DontEnum, DontDelete, ReadOnly]
+
+   this test checks the DontDelete attribute of Number.NaN
+
+   Author:             christine@netscape.com
+   Date:               16 september 1997
+*/
+
+
+var SECTION = "15.7.3.4-2";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "Number.NaN";
+
+writeHeaderToLog( SECTION + " "+ TITLE );
+
+new TestCase(SECTION,
+	     "delete( Number.NaN ); Number.NaN",      
+	     NaN,       
+	     eval("delete( Number.NaN );Number.NaN" ));
+
+new TestCase( SECTION,
+	      "delete( Number.NaN )",  
+	      false, 
+	      eval("delete( Number.NaN )") );
+
+test();