@Test
public void testOperationCount() {

    int numItems = 250;
    RunnableHolder runnables = new RunnableHolder(numItems);
    runnables.addOperations(fixture);
    assertTrue(fixture.operationCount().intValue() > 0);
    fixture.waitUntilAllOperationsAreFinished();
    assertEquals(0, fixture.operationCount().intValue());
}