Rails：良好的Rspec2示例用法？ （另外：Cucumber，Pickle，Capybara）

I'm looking for a rather recent open source application that uses Rspec 2 as test library. I'd like to see how an experienced developer utilizes the library properly to test the full stack, since I'm constantly in doubt concerning my own knowledge (coming from testunit and partly due to the rather sparse documentation of the latest Rspec release, even though it is constantly improved).I'm looking for a rather recent open source app