CountStackFrames.java

/*
 * Copyright (c) 2019, 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.
 *
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 */

/* @test
 * @bug 8205132
 * @summary Test Thread.countStackFrames()
 * @run testng CountStackFrames
 */

import org.testng.annotations.Test;

public class CountStackFrames {

    // current thread
    @Test(expectedExceptions = UnsupportedOperationException.class)
    public void testCurrentThread() {
        Thread.currentThread().countStackFrames();
    }

    // unstarted thread
    @Test(expectedExceptions = UnsupportedOperationException.class)
    public void testUnstartedThread() {
        Thread thread = new Thread(() -> { });
        thread.countStackFrames();
    }

    // terminated thread
    @Test(expectedExceptions = UnsupportedOperationException.class)
    public void testTerminatedThread() throws Exception {
        Thread thread = new Thread(() -> { });
        thread.start();
        thread.join();
        thread.countStackFrames();
    }

}