@Test
public void testOnDestroy() {

    mModel.setCurrentSentenseId(2L);
    mSentenceDetailPresenter.onDestroy();
    // release player
    verify(mAudioPlayer).releaseMediaPlayer();
    // unregister event listener
    verify(mEventBus).unregister(mSentenceDetailPresenter);
    // post FocusedSentenceEvent
    verify(mEventBus).postSticky(mFocusedSentenceEventCaptor.capture());
    FocusedSentenceEvent event = mFocusedSentenceEventCaptor.getValue();
    assertEquals(event.getSentenceId(), 2L);
}