### Question:
CarControlImpl implements CarControl { @Override public synchronized void addSteer(int value) { setSteerValue(currentSteerValue + value); } CarControlImpl(ArduinoCommunicator arduinoInstance); @Override int getLastThrottle(); @Override int getLastSteer(); @Override synchronized void setThrottle(int value); @Override synchronized void setSteerValue(int value); @Override synchronized void addThrottle(int value); @Override synchronized void addSteer(int value);  }### Answer:
@Test void addSteer() { carControl.addSteer(1); assertEquals(carControl.getLastSteer(), STEER_VALUE + 1); }