We're building a very simple app, and we decided to start with Rails3. Here is our stack so far:

1. Rails3
2. HAML
3. Paperclip
4. is_taggable
5. twitter-auth
6. mocha
7. shoulda
8. factory_girl
9. theia

Gotcha Number One: Shoulda

When we try using shoulda as advertised, we run into a problem where bundler requires it before Rails.root or RAILS_ROOT is set. Hence we had to work around it by putting shoulda and factory_girl in a different bundler group (KUDOS to tim for the idea).

Our Gemfile so far

http://gist.github.com/311893

NOTE: We put the code

Bundler.require(:thoughtbot)

Somewhere in our test_helper to require shoulda without it complaining.