Docker for Rails Developers

Setting Up RSpec

Now that our app is configured correctly with Compose, setting up RSpec is going to be very familiar. Let’s whiz through this quickly.

Following the instructions from rspec-rails,^[41] we need to add the following to our Gemfile:

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger…
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'rspec-rails', '~> 3.8'
end

First, let’s stop our web service:

$ docker-compose stop web

Next, we need to rebuild our image to run bundle install, and then create a new container from it:

$ docker-compose build web
Building web
Step 1/12 : FROM ruby:2.6
...
Step 7/12 : RUN apt-get update ...