### Question:
UpdateOrientationRoutine implements OrientationSensor.Listener { public void start() { orientationSensor.start(this); } UpdateOrientationRoutine(CameraDevice cameraDevice,
                                    OrientationSensor orientationSensor,
                                    Executor cameraExecutor,
                                    Logger logger); void start(); void stop(); @Override void onOrientationChanged(final int degrees);  }### Answer:
@Test public void start() throws Exception { testee.start(); verify(orientationSensor).start(testee); verifyZeroInteractions(logger); }