### Question:
BlinkStickTrafficLightImpl extends AbstractTrafficLight<String> { @Override public void switchOff(Color color) { blinkStick.turnOff(); } BlinkStickTrafficLightImpl(BlinkStick blinkStick); @Override void switchOn(Color color); @Override void switchOff(Color color); @Override void close();  }### Answer:
@Test public void testSwitchOff() throws Exception { light.switchOffAllLeds(); verify(blinkStick, times(3)).turnOff(); }