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diff --git a/js/src/tests/ecma/Boolean/15.6.3.1-4.js b/js/src/tests/ecma/Boolean/15.6.3.1-4.js
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@@ -0,0 +1,41 @@
+/* -*- 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:          15.6.3.1-4.js
+   ECMA Section:       15.6.3.1 Properties of the Boolean Prototype Object
+
+   Description:        The initial value of Boolean.prototype is the built-in
+   Boolean prototype object (15.6.4).
+
+   The property shall have the attributes [DontEnum,
+   DontDelete, ReadOnly ].
+
+   This tests the ReadOnly property of Boolean.prototype
+
+   Author:             christine@netscape.com
+   Date:               30 september 1997
+
+*/
+var SECTION = "15.6.3.1-4";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "Boolean.prototype"
+  writeHeaderToLog( SECTION + TITLE );
+
+var BOOL_PROTO = Boolean.prototype;
+
+new TestCase( SECTION,
+	      "var BOOL_PROTO = Boolean.prototype; Boolean.prototype=null; Boolean.prototype == BOOL_PROTO",
+	      true,
+	      eval("var BOOL_PROTO = Boolean.prototype; Boolean.prototype=null; Boolean.prototype == BOOL_PROTO") );
+
+new TestCase( SECTION,
+	      "var BOOL_PROTO = Boolean.prototype; Boolean.prototype=null; Boolean.prototype == null",
+	      false,
+	      eval("var BOOL_PROTO = Boolean.prototype; Boolean.prototype=null; Boolean.prototype == null") );
+
+test();