public void NextMoveShouldCallMakeMoveOfAppropriatePlayer()
 {
     Game target = new Game(new HumanPlayer('X'), new ComputerPlayer('O'));
     Tuple<int,int> actual = target.NextMove();
     Tuple<int,int> expected = null;
     Assert.AreEqual(expected, actual);
     target.LogMove(new Tuple<int, int>(1, 1));
     actual = target.NextMove();
     Tuple<int, int> notExpected = null;
     Assert.AreNotEqual(notExpected, actual);
 }