public void Check_selects_only_valid_spaces()
{
_board.SetCellToSelected(0, 0);
Assert.IsTrue(!_board.IsSquareSelected(0, 0), "Selected 0, 0");
_board.SetCellToSelected(0, 1);
Assert.IsTrue(_board.IsSquareSelected(0, 1), "Did not select 0, 1");
}
