If you have looked at the "test" directory sitting at the bottom of your Rails applications and have wondered what it's there for, this is the course for you! Our test-first development video course walks through the basics of writing a simple application with the principles of test-first and behavior-driven development. You'll use the features already built into Rails and learn how to extend it for your own needs, too. The exercise files download includes the actual code discussed in the screencast (recently updated for Rails 1.2.2). Rails 1.2.2 is used for the project but most of the content applies to any current version of Rails.