public void CannotDetachTrailerTwice()
{
var trailerHook = new TrailerHook();
Assert.Throws <DomainRuleViolatedException>(() =>
{
trailerHook.DetachTrailer();
trailerHook.DetachTrailer();
});
}
public void DetachingTrailerResultsInEvent()
{
var trailerHook = new TrailerHook();
trailerHook.AttachTrailer();
var events = trailerHook.DetachTrailer();
Assert.True(events.Any(x => x is TrailerHookStoppedBeingOccupied));
}