## Set up the dev environment git clone https://github.com/rspec/rspec-mocks.git cd rspec-mocks gem install bundler bundle install Now you should be able to run any of: rake rake spec rake cucumber Or, if you prefer to use the rspec and cucumber commands directly, you can either: bundle exec rspec Or ... bundle install --binstubs bin/rspec ## Customize the dev environment The Gemfile includes the gems you'll need to be able to run specs. If you want to customize your dev environment with additional tools like guard or ruby-debug, add any additional gem declarations to Gemfile-custom (see Gemfile-custom.sample for some examples).