Refactor Huffman tests.
Refactor Huffman tests.

Lukasa/hyper,plucury/hyper,Lukasa/hyper,irvind/hyper,lawnmowerlatte/hyper,lawnmowerlatte/hyper,fredthomsen/hyper,jdecuyper/hyper,plucury/hyper,fredthomsen/hyper,jdecuyper/hyper,masaori335/hyper,masaori335/hyper,irvind/hyper