public void MeetupStateInvalidTransitionTest(MeetupState from, MeetupState to)
{
Assert.False(from.CanTransitionTo(to));
Assert.Throws <ArgumentException>(() => from.TransitionTo(to));
}
public void MeetupStateValidTransitionTest(MeetupState from, MeetupState to)
{
Assert.True(from.CanTransitionTo(to));
Assert.Equal(to, from.TransitionTo(to));
}