code: @Implementation(minSdk = O)
    protected int requestAudioFocus(android.media.AudioFocusRequest audioFocusRequest) {
      lastAudioFocusRequest = new AudioFocusRequest(audioFocusRequest);
      return nextResponseValue;
    }
docs: Provides a mock like interface for the requestAudioFocus method by storing the request object
  for later inspection and returning the value specified in setNextFocusRequestResponse.