public void ReleaseTetrimino_TerminoPlaced_RemoveTetriminoButKeepBlocks()
{
Block[] blocks = { new Block(), new Block() };
Tetrimino tetrimino = new Tetrimino(Direction.UP, blocks);
_tetrisBoard.AddTetriminoAt(tetrimino, new Point(2, 2));
_tetrisBoard.ReleaseTetrimino(tetrimino);
Assert.Empty(_tetrisBoard.AllTetriminos());
Assert.Null(_tetrisBoard.TetriminoPoint(tetrimino));
Assert.Equal(2, _tetrisBoard.AllBlocks().Length);
Assert.Equal(blocks[1], _tetrisBoard.BlockAt(new Point(2, 2)));
Assert.Equal(blocks[0], _tetrisBoard.BlockAt(new Point(2, 1)));
}