public void ChangeTurnTest()
{
TicTacToe ticTacToe = new TicTacToe();
ticTacToe.Player = 'X';
ticTacToe.ChangeTurn();
Assert.AreEqual(ticTacToe.Player, 'O');
ticTacToe.ChangeTurn();
Assert.AreEqual(ticTacToe.Player, 'X');
}