Add RSpec

I need to add the rspec gem to my ruby project. How do I do that?  Can I do this from the command line or do I need to open a file? Looks like I need to open my "gemspec" file and add the line: spec.add_development_dependency "rspec" Then, I can install the gem through bundler from the command line: $ bundle install Next, add a directory structure and spec files. [project]/spec/spec_helper.rb # Reference code in ../lib [project]/spec/[gem name]/actual_spec.rb # Relative reference to ../spec_helper.rb Now you should be able to run rspec from the command line: $ bundle exec rspec actual_spec.rb