public void TestAAvailablePlaysEmptyBoard()
        {
            TicTacToeBoard b = new TicTacToeBoard();
            List <(int, int, int, int)> allPlays = new List <(int, int, int, int)>();

            allPlays.Add((0, 0, 0, 0)); // Something in the list initially.
            int majorRow = 1;
            int majorCol = 2;

            for (int i = 0; i < 3; i++) // Adds all squares, using the given values for majorRow and MajorCol
            {
                for (int j = 0; j < 3; j++)
                {
                    allPlays.Add((majorRow, majorCol, i, j));
                }
            }
            List <(int, int, int, int)> avail = new List <(int, int, int, int)>();

            avail.Add((0, 0, 0, 0));                       // The initial list content
            b.GetAvailablePlays(avail, majorRow, majorCol);
            Assert.That(avail, Is.EquivalentTo(allPlays)); // avail and allPlays should contain the same elements
        }