Gemfile

source 'https://rubygems.org'

gem 'rails'

# some gems

group :development, :test do
  gem 'rspec'
  gem 'rspec-rails'

  # some gems
end

group :test do
  gem 'poltergeist'
  gem 'launchy'
  gem 'database_cleaner'

  # some gems
end

local_gemfile = File.join(File.dirname(__FILE__), 'Gemfile.local')
instance_eval File.read(local_gemfile) if File.exists?(local_gemfile)

Gemfile.local

group :development, :test do
  gem 'pry'
  gem 'pry-rails'
  gem 'pry-byebug'

  # some gems for debug
end