[TestCase(false)] // A non null track is to be used for testing public void Addition_of_track(bool isNull) { if (isNull) { Track nullTrack = null; ConferenceManager.AddTrack(nullTrack); } else { int numberOfExistingTracks = ConferenceManager.Tracks.Count; Track newTrack = new Track(); ConferenceManager.AddTrack(newTrack); ConferenceManager.Tracks.Count.Should().Be(numberOfExistingTracks + 1); } }