circular_proto.js revision 512:b7c04b3b01a7 
1/*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/**
25 * JDK-8023368: Instance __proto__ property should exist and be writable.
26 *
27 * @test
28 * @run
29 */
30
31// check that we cannot create __proto__ cycle
32load("nashorn:mozilla_compat.js");
33
34var obj = {};
35var obj2 = Object.create(obj);
36
37// attempt to create __proto__ cycle
38try {
39    obj.__proto__ = obj2;
40    fail("Should have thrown TypeError");
41} catch (e) {
42    if (! (e instanceof TypeError)) {
43        fail("Expected TypeError, got " + e);
44    }
45    print(e);
46}
47