--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/maptests/property_add.js	Thu Feb 06 17:44:37 2014 +0530
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @option -Dnashorn.debug=true
+ * @fork
+ */
+
+load(__DIR__ + "maputil.js");
+
+function Foo() {}
+
+var obj1 = new Foo();
+var obj2 = new Foo();
+
+assertSameMap(obj1, obj2);
+
+// property addition at same callsite
+function addX(obj, val) {
+   obj.x = val;
+}
+addX(obj1, 3);
+addX(obj2, 'hello');
+
+assertSameMap(obj1, obj2);