@Test
public void thatCanCreateADefaultThreadManagerWithSingleQueuePolicy() {

    DefaultThreadManager defaultThreadManager = new DefaultThreadManager();
    Future future = defaultThreadManager.enqueue(Threading.SINGLE_QUEUE_POLICY, givenARunnable(mCallbackFlag));
    assertThat(mCallbackFlag.isFlagged()).isFalse();
    assertThat(future).isNotNull();
}