@Test
public void testOperations() {

    int numItems = 250;
    RunnableHolder runnables = new RunnableHolder(numItems);
    runnables.addOperations(fixture);
    assertTrue("Should have some operations", fixture.operations().count() > 0);
    fixture.waitUntilAllOperationsAreFinished();
    assertTrue("Should have completed all operations", fixture.operations().count() == 0);
}