public PerThreadSingletonTest(String name) 
{
        super(name);
}

 protected static Test makeRepeatedLoadTest(int users,
    int iterations,
    String testMethod) 
{
        long maxElapsedTime = 1200 + (1000 * users * iterations);
        Test testCase = new PerThreadSingletonTest(testMethod);
        Test repeatedTest = new RepeatedTest(testCase, iterations);
        Test loadTest = new LoadTest(repeatedTest, users);
        Test timedTest = new TimedTest(loadTest, maxElapsedTime);
        return timedTest;
}

JUnit method to exercise test via threads and loops

 public  void setUp() throws Exception 
{
         
        super.setUp();
        synchronized (PerThreadSingletonTest.class) {
            if (singleton == null) {
                singleton = new PerThreadSingleton();
                singleton.setSingletonClassName(HashMap.class.getName());
            }
        }
}

 public static Test suite() 
{
        TestSuite suite = new TestSuite();
        suite.addTest(makeRepeatedLoadTest(5, 100, "testInstance"));
        return suite;
}

Assembles and returns a test suite.

 public  void tearDown() throws Exception 
{
        super.tearDown();
}

 public  void testInstance() throws Exception 
{
        String tid = Thread.currentThread().getName();
        Map map = (Map) singleton.instance();
        String expected = "new value";
        if (!map.containsKey(tid) && reference.get() != null) {
            System.out.println("tid=" + tid + " map=" + map);
            System.out.println("reference=" + reference);
            System.out.println("singleton=" + singleton);
            fail("created singleton more than once");
        } else {
            map.put(tid, expected);
            reference.set(map);
        }
        String actual = (String) map.get(tid);
        // System.out.println("tid="+tid+ " map="+map);
        assertEquals("testInstance", expected, actual);
        map = (Map) singleton.instance();
        expected = "new value";
        actual = (String) map.get(tid);
        // System.out.println("tid="+tid+ " map="+map);
        // System.out.println("reference="+reference);
        // System.out.println("singleton="+singleton);
        assertEquals("testInstance", expected, actual);
        assertEquals("testInstance reference", reference.get(), map);
}