diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma/Expressions/11.4.1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma/Expressions/11.4.1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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:          11.4.1.js
+   ECMA Section:       11.4.1 the Delete Operator
+   Description:        returns true if the property could be deleted
+   returns false if it could not be deleted
+   Author:             christine@netscape.com
+   Date:               7 july 1997
+
+*/
+
+
+var SECTION = "11.4.1";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "The delete operator";
+
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+//    new TestCase( SECTION,   "x=[9,8,7];delete(x[2]);x.length",         2,             eval("x=[9,8,7];delete(x[2]);x.length") );
+//    new TestCase( SECTION,   "x=[9,8,7];delete(x[2]);x.toString()",     "9,8",         eval("x=[9,8,7];delete(x[2]);x.toString()") );
+new TestCase( SECTION,   "x=new Date();delete x;typeof(x)",        "undefined",    eval("x=new Date();delete x;typeof(x)") );
+
+//    array[item++] = new TestCase( SECTION,   "delete(x=new Date())",        true,   delete(x=new Date()) );
+//    array[item++] = new TestCase( SECTION,   "delete('string primitive')",   true,   delete("string primitive") );
+//    array[item++] = new TestCase( SECTION,   "delete(new String( 'string object' ) )",  true,   delete(new String("string object")) );
+//    array[item++] = new TestCase( SECTION,   "delete(new Number(12345) )",  true,   delete(new Number(12345)) );
+new TestCase( SECTION,   "delete(Math.PI)",             false,   delete(Math.PI) );
+//    array[item++] = new TestCase( SECTION,   "delete(null)",                true,   delete(null) );
+//    array[item++] = new TestCase( SECTION,   "delete(void(0))",             true,   delete(void(0)) );
+
+// variables declared with the var statement are not deletable.
+
+var abc;
+new TestCase( SECTION,   "var abc; delete(abc)",        false,   delete abc );
+
+new TestCase(   SECTION,
+                "var OB = new MyObject(); for ( p in OB ) { delete p }",
+                true,
+                eval("var OB = new MyObject(); for ( p in OB ) { delete p }") );
+
+test();
+
+function MyObject() {
+  this.prop1 = true;
+  this.prop2 = false;
+  this.prop3 = null;
+  this.prop4 = void 0;
+  this.prop5 = "hi";
+  this.prop6 = 42;
+  this.prop7 = new Date();
+  this.prop8 = Math.PI;
+}