public void Detach_DoesNotThrow()
{
var messageBoard = new MessageBoard();
var observerMock = new Mock <IMessageBoardObserver>();
Assert.DoesNotThrow(() => messageBoard.Detach(observerMock.Object));
}
public void Detach_NullObserver_ArgumentNullException()
{
var messageBoard = new MessageBoard();
var ex = Assert.Throws <ArgumentNullException>(() => messageBoard.Detach(null));
Assert.That(ex.ParamName, Is.EqualTo(DetachObserverParam));
}