--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/nashorn/script/basic/javaclassoverrides.js	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,87 @@
+/*
+ * 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 behavior of class-level overrides.
+ *
+ * @test
+ * @run
+ */
+
+
+// Make two classes with class overrides
+
+var R1 = Java.extend(java.lang.Runnable, {
+    run: function() {
+        print("R1.run() invoked")
+    }
+})
+
+var R2 = Java.extend(java.lang.Runnable, {
+    run: function() {
+        print("R2.run() invoked")
+    }
+})
+
+var r1 = new R1
+var r2 = new R2
+// Create one with an instance-override too
+var R3 = Java.extend(R2)
+var r3 = new R3({ run: function() { print("r3.run() invoked") }})
+
+// Run 'em - we're passing them through a Thread to make sure they indeed
+// are full-blown Runnables
+function runInThread(r) {
+    var t = new java.lang.Thread(r)
+    t.start()
+    t.join()
+}
+runInThread(r1)
+runInThread(r2)
+runInThread(r3)
+
+// Two class-override classes differ
+print("r1.class !== r2.class: " + (r1.class !== r2.class))
+// instance-override class also differs
+print("r2.class !== r3.class: " + (r2.class !== r3.class))
+
+function checkAbstract(r) {
+    try {
+        r.run()
+        print("Expected to fail!")
+    } catch(e) {
+        print("Got exception: " + e)
+    }
+}
+
+// Check we're hitting UnsupportedOperationException if neither class
+// overrides nor instance overrides are present
+var RAbstract = Java.extend(java.lang.Runnable, {})
+checkAbstract(new RAbstract()) // class override (empty)
+checkAbstract(new (Java.extend(RAbstract))() {}) // class+instance override (empty)
+
+// Check we delegate to superclass if neither class
+// overrides nor instance overrides are present
+var ExtendsList = Java.extend(java.util.ArrayList, {})
+print("(new ExtendsList).size() = " + (new ExtendsList).size())
+print("(new (Java.extend(ExtendsList)){}).size() = " + (new (Java.extend(ExtendsList)){}).size())