Replace meaningless method names

There are a few abbreviated method names reused throughout the code that are meaningless to new users. Method names such as "nk", "nf" or "ane" are not helpful when trying to determine how a class works. This seems to only occur in Tests but I think it would improve readability a lot, especially for newbies. I for one think Tests are a good place to learn how a class works and choosing brevity over clarity greater hinders the readability of a Test.