public void NextRound_ThrowsExceptionsForInvalidGameState(MahjongGame game)
 {
     game.NextRound();
 }
 public int NextRound_UpdatesOyaCorrectly(MahjongGame game)
 {
     game.NextRound();
     return game.Rounds.Last().Oya;
 }
 public int NextRound_AddsRoundCorrectly(MahjongGame game)
 {
     game.NextRound();
     return game.Rounds.Count;
 }