Java example source code file (nonextensible_proto_assign.js)

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Java - Java tags/keywords

expected, should, typeerror

The nonextensible_proto_assign.js Java example source code

/*
 * 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.
 */

/**
 * JDK-8023368: Instance __proto__ property should exist and be writable.
 *
 * @test
 * @run
 */

// check that we cannot assign to __proto__ of a non-extensible object
try {
    var obj = {}
    Object.preventExtensions(obj);
    obj.__proto__ = { };
    fail("Should have thrown TypeError");
} catch (e) {
    if (! (e instanceof TypeError)) {
        fail("Expected TypeError, got " + e);
    }
    print(e);
}