[detaro]

… this reply does nothing to answer the parent's question. It's obvious that you can run it on all possible values, but that doesn't answer the question of the return values. (unless you only want to verify "doesn't crash" or something similarly basic)

[praptak]

I believe the question was edited after I wrote my answer. This, or I just misread it - unfortunately HN doesn't let us know. Anyway, I'm providing another answer to the question as it is now.