If you've read any of my ruby stuff, you'll notice that I was using RSpec for the Ruby stuff, then I switched to the Test::Unit framework while working on learning Rails. Why is this? Well, it is very simple: the book I was going through was using Test::Unit. Personally, I really like the RSpec model and am intending to learn to use it for Rails. My current project, What Is This, will be a great opportunity to learn RSpec on Rails, as well.
The first step for learning RSpect on Rails is to get RSpec as my test framework for the rails application.