Part of Gemfile including the gems

Gemfile

...
group :development, :test do
  gem 'rspec-rails'
  gem 'rails-controller-testing'
  gem 'factory_girl_rails'
  gem 'faker'

  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platform: :mri
end
...