add_cucumber_to_gemfile.rb

# add to end of Gemfile
group :test, :development do
  gem 'cucumber-rails'
  gem 'cucumber-rails-training-wheels' # some pre-fabbed step definitions
  gem 'database_cleaner' # to clear Cucumber's test database between runs
  gem 'capybara'         # lets Cucumber pretend to be a web browser
  gem 'launchy'          # a useful debugging aid for user stories
end