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Asked: 2026-05-17T20:44:27+00:00

I’m trying to test java.util.concurrent.ConcurrentLinkedQueue when accessed via multiple threads. Mentioned below is my

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I’m trying to test java.util.concurrent.ConcurrentLinkedQueue when accessed via multiple threads. Mentioned below is my Junit test using RepeatedTest to run in two concurrent threads. My questions is: is it correct to use RepeatedTest to test concurrency for example on ConcurrentLinkedQueue? The source code is mentioned below.

Thanks

import java.util.concurrent.ConcurrentLinkedQueue;
import junit.extensions.ActiveTestSuite;
import junit.extensions.RepeatedTest;
import junit.extensions.TestSetup;
import junit.framework.TestCase;

public class TestNonBlockingConcurrentQueue extends TestCase{

private static ConcurrentLinkedQueue clq;

public void testPut() throws Exception {
    int messageCounter = 0;
    for(;messageCounter <10000; messageCounter++){
        clq.offer(messageCounter);
    }
    assertEquals(clq.size(), messageCounter);
}

public void testGet() throws Exception {
    while(!clq.isEmpty()){
        clq.poll();
    }
    assertEquals("Size should be zero", clq.size(), 0);
}

public static junit.framework.Test suite( ) {
    ActiveTestSuite ats = new ActiveTestSuite();

    TestSetup setup = new TestSetup(ats) {
       protected void setUp() throws Exception {
            System.out.println("Creating ConcurrentLinkedQueue..");
            clq = new ConcurrentLinkedQueue();
        }
        protected void tearDown(  ) throws Exception {
            clq = null;
        }
    };
    ats.addTest(new RepeatedTest(new TestNonBlockingConcurrentQueue("testPut"), 2));
    ats.addTest(new RepeatedTest(new TestNonBlockingConcurrentQueue("testGet"), 2));
    return setup;

}

public TestNonBlockingConcurrentQueue(String testName){
    super(testName);
}
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1 Answer

  1. Editorial Team

    JUnitPerf uses RepeatedTest to test concurrent code so it seems reasonable to use it to do the same thing with your test above, see:

    http://www.clarkware.com/software/JUnitPerf.html

    There are other methods for unit testing concurrent code, although none of them can really verify that your code is thread safe:

    Also see: Unit Testing Concurrent Code

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