Add tests

![http://media.tumblr.com/tumblr_m7or5ecmr41rter4a.gif](http://media.tumblr.com/tumblr_m7or5ecmr41rter4a.gif)

This project doesn't have any tests, so we should remedy that.
I tell a lie.  I just removed it again and it still works.  What was causing the problem I experienced previously, I have no idea. :/