Testing is love. Especially when done with "Shoulda":http://thoughtbot.com/projects/shoulda. Shoulda makes testing your Rails app pretty easy. There are tons of Rails plugins and gems out there. It should be easy to test your Rails app that uses these as well. That kind of support doesn't really belong in Shoulda itself, though. That's where Woulda comes in.
Gemfile gem 'svenaas-woulda', '~> 0.2.3'
install gem install svenaas-woulda -v 0.2.3