I don’t quite understand what testAdd tests…
It tries to add an unrotated J-Piece at (10, 10) of a (15, 24) empty board.
So the board coordinates (9, 10), (10, 10), (11, 9) and (11, 10) should be set to the J-Type.
Looking kind of like this:
But why should it assert false, this seems possible to add this piece, since it is not out of bounds?