public void ExploredCellisDash()
        {
            var grid = new Grid(3,3);

            grid = grid.Sweep(new Coordinate(2, 2));

            Assert.AreEqual('-', (GridRenderer.RenderCell(new GridView(grid), 2,2)) );
        }
        public void SweepingCellMakesExploredTrue()
        {
            var grid = new Grid(3, 3);

            grid = grid.Sweep(new Coordinate(2, 2));

            Assert.AreEqual(grid.Explored[2, 2], true);
        }