The Shoulda Rails plugin makes it easy to write elegant, understandable, and maintainable tests. Shoulda consists of test macros, assertions, and helpers added on to the Test::Unit framework. It’s fully compatible with your existing tests, and requires no retooling to use. Usage examples can be found here. There is also a Shoulda gem available for use in other Ruby projects.
Author: Tammer Saleh, Thoughtbot
Installation:
ruby script/plugin install git://github.com/thoughtbot/shoulda.git