/*
 * Copyright (c) 2003, 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
 * @bug 4247236
 * @summary Ensure that reference objects with null referents can be enqueued
 */
package test.java.lang.ref;

import java.lang.ref.*;

import org.testng.annotations.Test;
import org.testng.Assert;

public class EnqueueNullRefTest {

    static void test(ReferenceQueue q, Reference r) {
        if (!r.enqueue())
            throw new RuntimeException("Enqueue operation failed");
    }

    @Test
    public void test() {
        ReferenceQueue q = new ReferenceQueue();
        test(q, new WeakReference(null, q));
        test(q, new SoftReference(null, q));
        test(q, new PhantomReference(null, q));
    }

}
