public void CheckPositionOnBoard_InvalidPosition_Throw()
        {
            var checkPosition = new CheckPosition();

            char[,] board = new char[, ]
            {
                { '1', '1', '1' },
                { '1', 'M', '1' },
                { '1', '1', '1' },
            };
            Action test = () => checkPosition.CheckPositionOnBoard(8, 8, board);

            test.Should().Throw <Exception>();
        }
        public void CheckPositionOnBoard_ItsMine_ShouldBeM()
        {
            var checkPosition = new CheckPosition();

            char[,] board = new char[, ]
            {
                { '1', '1', '1' },
                { '1', 'M', '1' },
                { '1', '1', '1' },
            };

            var result = checkPosition.CheckPositionOnBoard(1, 1, board);

            Assert.AreEqual(result, 'M');
        }