public void TestSwapTiles()
{
var grid = new Grid();
var emptyTile = new Tile(string.Empty, 0, TileType.Empty);
grid.AddTile(emptyTile);
Tile tile = emptyTile.CloneMemberwise();
tile.Label = "1";
tile.Position = 1;
tile.Type = TileType.Number;
grid.AddTile(tile);
grid.SwapTiles(tile);
var actual = tile.Position;
var expected = 0;
Assert.AreEqual(expected, actual);
}