public void NULLNotifyObserversTest() { RegistrationUpdate regUpdate = new RegistrationUpdate("Registered", "3", "10/13/2017 10:00:00 PM", "Matt", "Morris", "M", "24"); Athlete athlete1 = new Athlete(regUpdate.Status, regUpdate.BibNumber, regUpdate.Timestamp.ToString(), regUpdate.LastName, regUpdate.Gender, regUpdate.Age); //try to notify observers when there are none try { athlete1.NotifyObservers(); } catch { Assert.Fail(); } }