1 /*

     2  * Copyright (c) 2019, 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 /* @test

    25  * @bug 8205132

    26  * @summary Test Thread.countStackFrames()

    27  * @run testng CountStackFrames

    28  */

    29 

    30 import org.testng.annotations.Test;

    31 

    32 public class CountStackFrames {

    33 

    34     // current thread

    35     @Test(expectedExceptions = UnsupportedOperationException.class)

    36     public void testCurrentThread() {

    37         Thread.currentThread().countStackFrames();

    38     }

    39 

    40     // unstarted thread

    41     @Test(expectedExceptions = UnsupportedOperationException.class)

    42     public void testUnstartedThread() {

    43         Thread thread = new Thread(() -> { });

    44         thread.countStackFrames();

    45     }

    46 

    47     // terminated thread

    48     @Test(expectedExceptions = UnsupportedOperationException.class)

    49     public void testTerminatedThread() throws Exception {

    50         Thread thread = new Thread(() -> { });

    51         thread.start();

    52         thread.join();

    53         thread.countStackFrames();

    54     }

    55 

    56 }