diff -r 02f810c26ff9 -r d7e83be6e7aa test/script/sandbox/interfaceimpl.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/script/sandbox/interfaceimpl.js	Thu Feb 07 17:17:29 2013 +0530
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2010, 2013, 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.
+ */
+
+/**
+ * Check that user defined interface can be implemented.
+ *
+ * @test
+ * @run
+ * @security
+ */
+
+var Window = Java.type("jdk.nashorn.api.scripting.Window");
+var WindowEventHandler = Java.type("jdk.nashorn.api.scripting.WindowEventHandler");
+
+var w = new Window();
+
+var loadedFuncReached = false;
+// try function to SAM converter
+w.onload = function() {
+    loadedFuncReached = true;
+    return true;
+}
+
+w.onload.loaded();
+if (! loadedFuncReached) {
+    fail("Interface method impl. not called");
+}
+
+// reset
+loadedFuncReached = false;
+
+// try direct interface implementation
+w.onload = new WindowEventHandler() {
+    loaded: function() {
+        loadedFuncReached = true;
+        return true;
+    }
+};
+
+w.onload.loaded();
+if (! loadedFuncReached) {
+    fail("Interface method impl. not called");
+}