Gemに追加する group :development, :test do # Call 'byebug' anywhere in the code to stop execution and get a debugger console gem 'byebug', platforms: [:mri, :mingw, :x64_mingw] gem 'rspec-rails', '~> 4.0.0' ←追加 end % cd ~/〇〇 #〇〇のデ…