I wrote up the 5th part of the series of blog posts about writing Ruby gems. This one is about setting up Rspec to test your gem. If you missed the previous posts, you can find all the posts linked here.
I just created the gem spellingbee which is a spelling correction tool. It's my first gem, so it has way too many bugs to fix, but I'd appreciate feedback on how to improve it. Please do fork it on github and improve it or report a bug here.