public void GIVEN_game_has_a_winner_cross_THEN_game_is_over()
        {
            var game = new TTTGame();

            game.placeCross(0, 0);
            game.placeCircle(1, 0);
            game.placeCross(0, 1);
            game.placeCircle(1, 1);
            game.placeCross(0, 2);

            Assert.IsTrue(game.isOver());
        }
 public void GIVEN_new_game_THEN_game_is_not_over()
 {
     var game = new TTTGame();
     Assert.IsFalse(game.isOver());
 }