public void RemoveTetrimino_TetriminoPlaced_RemoveTetriminoAndBlocks()
{
Block[] blocks = { new Block(), new Block() };
Tetrimino tetrimino = new Tetrimino(Direction.UP, blocks);
_tetrisBoard.AddTetriminoAt(tetrimino, new Point(2, 2));
_tetrisBoard.RemoveTetrimino(tetrimino);
Assert.Empty(_tetrisBoard.AllBlocks());
Assert.Empty(_tetrisBoard.AllTetriminos());
Assert.Null(_tetrisBoard.TetriminoPoint(tetrimino));
Assert.Null(_tetrisBoard.BlockAt(new Point(2, 2)));
Assert.Null(_tetrisBoard.BlockAt(new Point(2, 3)));
}