public void GivenInstatiatedTrafficLight_WhenSetToRedState_ThenRedLightLightIsOn_AndOthersAreOff()
{
// ARRANGE
var trafficLight = new TrafficLightsSeriesPart1();
// ACT
trafficLight.Set(State.Red);
var amberActual = trafficLight.IsAmberOn;
var greenActual = trafficLight.IsGreenOn;
var redActual = trafficLight.IsRedOn;
// ASSERT
Assert.IsFalse(amberActual);
Assert.IsFalse(greenActual);
Assert.IsTrue(redActual);
}
