btw, i've used for the same purpose freearc (and found 3 very rare errors in tornado, although it's much more complex algorithm. OTOH, quicklz is commercial library so i understand your need to highest level of testing). look at
http://encode.ru/forums/index.php?action=vthread&forum=1&topic=681&page=0#msg9695i don't added there that fa allows to split data in independent solid blocks of given size, so you can test it not only file-wise