public void CleanRows_WithRows_RemoveAllRows(int numberOfRows)
{
for (int y = 0; y < numberOfRows; y++)
{
FillBoardRowAt(y);
}
Block nonRowBlock = new Block();
Point atPoint = new Point(4, 4);
_tetrisBoard.AddBlockAt(nonRowBlock, atPoint);
_tetrisBoardOperator.CleanRows();
Assert.Equal(0, _tetrisBoardOperator.Rows());
Assert.Single(_tetrisBoard.AllBlocks());
Assert.Equal(nonRowBlock, _tetrisBoard.BlockAt(atPoint));
}