When I teach someone Ruby, I always need the simplest possible TDD setup.
This Git project is a simple setup with RSpec and Simplecov.
To install all required gems run:
$ gem install bundler
$ bundle install
$ rbenv rehash # Only if you use Rbenv
To run the tests with coverage (default) rspec
$ rspec
.
Finished in 0.0002 seconds
1 example, 0 failures
Coverage report generated for RSpec to ./coverage. 3 / 3 LOC (100.0%) covered.