public void TwoClassic2RockClassicIsPlayingRepeatPriorityZero() { _store.SetupGetTags(new[] { new MusicTag {Id = Constants.Tags.Genre, Priority = 2}, new MusicTag {Id = Constants.Tags.Album, Priority = 3} }); _store.Setup(s => s.GetRepeatPriority()).Returns(0); var musicA = new Music("A") { Priority = 1 }; musicA[Constants.Tags.Genre] = "Classic"; var musicB = new Music("B") { Priority = 2 }; musicB[Constants.Tags.Genre] = "Rock"; var musicC = new Music("C") { Priority = 3 }; musicC[Constants.Tags.Genre] = "Classic"; var musicD = new Music("D") { Priority = 4 }; musicD[Constants.Tags.Genre] = "Rock"; _store.SetupGetMusic(musicA); _store.SetupGetMusic(musicB); _store.SetupGetMusic(musicC); _store.SetupGetMusic(musicD); _musicLibrary.Add(musicA); _musicLibrary.Add(musicB); _musicLibrary.Add(musicC); _musicLibrary.Add(musicD); var playList = new PlayList(_musicLibrary) { "A", "B", "C", "D" }; playList.SetPlaying("A"); playList.UpdateProbability(); const double totalPriority = 13d; const double unitProbability = 1d / totalPriority; _store.VerifyAll(); AreEqual(0, playList["A"].Probability); AreEqual(unitProbability * musicB.Priority, playList["B"].Probability); AreEqual(unitProbability * (musicC.Priority + 4d), playList["C"].Probability); AreEqual(unitProbability * musicD.Priority, playList["D"].Probability); AreEqual(0, playList["A"].CumulativeProbability); AreEqual(unitProbability * 2, playList["B"].CumulativeProbability); AreEqual(unitProbability * 9, playList["C"].CumulativeProbability); AreEqual(unitProbability * 13, playList["D"].CumulativeProbability); }