public void UpdateTest()
{
TransitionCondition condition = Substitute.For <TransitionCondition>();
stateMachine.AddTransition(Color.Red, Color.Blue, condition);
stateMachine.Update();
handler.Received().HandleState(Color.Red);
handler.DidNotReceiveWithAnyArgs().OnStateEnter(Color.Red);
handler.DidNotReceiveWithAnyArgs().OnStateExit(Color.Red);
condition.IsFulfilled.Returns(true);
stateMachine.Update();
handler.Received().HandleState(Color.Red);
handler.Received().OnStateExit(Color.Red);
handler.Received().OnStateEnter(Color.Blue);
}