public void TestFullGrid()
        {
            Grid _grid = new Grid ();
            _grid.GridDraw ();

            Assert.IsFalse ( _grid.CheckFull () );

            _grid.Squares[0].SelectedX = true;
            _grid.Squares[1].SelectedX = true;
            _grid.Squares[2].SelectedO = true;
            _grid.Squares[3].SelectedO = true;
            _grid.Squares[4].SelectedX = true;
            _grid.Squares[5].SelectedX = true;
            _grid.Squares[6].SelectedX = true;
            _grid.Squares[7].SelectedO = true;
            _grid.Squares[8].SelectedO = true;

            Assert.IsTrue ( _grid.CheckFull () );
        }