Setup RSpec

Even though Rails uses Minitest per default, RSpec is the de-facto standard at Renuo.

Add the following gems to your Gemfile:

group :development, :test do
  gem "factory_bot_rails"
  gem "rspec-rails"
  gem "parallel_tests"
end

group :test do
  gem "shoulda-matchers"
  gem "simplecov", require: false
  gem "super_diff"
end

You should know exactly why you are adding each one of them and why is necessary.

• Also add /coverage/ to your .gitignore file.
• Remove the test folder from your project (there will be one called spec later).

Configuration

• Install rspec via rails generate rspec:install
• Create a bin stub with bundle binstubs rspec-core

spec/spec_helper.rb

Add SimpleCov configuration at the top of the file (before RSpec.configure):

# Run code coverage and exclude files with less than 5 lines of code
unless ENV["NO_COVERAGE"]
  require "simplecov"
  SimpleCov.start "rails" do
    add_filter "app/channels/application_cable/channel.rb"
    add_filter "app/channels/application_cable/connection.rb"
    add_filter "app/jobs/application_job.rb"
    add_filter "app/mailers/application_mailer.rb"
    add_filter "app/models/application_record.rb"
    add_filter ".semaphore-cache"
    enable_coverage :branch
    minimum_coverage line: 100, branch: 100
  end
end

Add the following configuration options inside the RSpec.configure block:

RSpec.configure do |config|
  # ... existing configuration ...

  config.expect_with :rspec do |expectations|
    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
  end

  config.mock_with :rspec do |mocks|
    mocks.verify_partial_doubles = true
  end

  config.run_all_when_everything_filtered = true

  config.define_derived_metadata do |meta|
    meta[:aggregate_failures] = true
  end
end

We suggest you to also unable/uncomment the following:

config.disable_monkey_patching!
config.default_formatter = "doc" if config.files_to_run.one?
config.profile_examples = 5
config.order = :random
Kernel.srand config.seed

spec/rails_helper.rb

Add the following requires:

# after `require "rspec/rails"`
require "capybara/rspec"
require "capybara/rails"
require "selenium/webdriver"
require "super_diff/rspec-rails"

Add the following after the requires (before RSpec.configure):

Rails.root.glob("spec/support/**/*.rb").each { |f| require f }

Add the following configuration inside the RSpec.configure block:

RSpec.configure do |config|
  # ... existing configuration ...

  config.include FactoryBot::Syntax::Methods
  config.include ActiveSupport::Testing::TimeHelpers
  config.include JavaScriptErrorReporter, type: :system, js: true

  config.infer_spec_type_from_file_location!

  config.before do |example|
    ActionMailer::Base.deliveries.clear
    I18n.locale = I18n.default_locale
    Rails.logger.debug { "--- #{example.location} ---" }
  end

  config.after do |example|
    Rails.logger.debug { "--- #{example.location} FINISHED ---" }
  end

  config.before(:each, type: :system) do
    driven_by :rack_test
  end

  config.before(:all, type: :system) do
    Capybara.server = :puma, { Silent: true }
  end

  config.before(:each, type: :system, js: true) do
    driven_by ENV["SELENIUM_DRIVER"]&.to_sym || :selenium_chrome_headless
    Capybara.page.current_window.resize_to(1280, 800)
  end
end

.env.example

# SELENIUM_DRIVER="selenium_chrome"
SELENIUM_DRIVER="selenium_chrome_headless"

config/environments/development.rb

config.generators do |g|
  g.test_framework :rspec
end

• Add the line bundle exec parallel_rspec to bin/check

Note: If you want to debug a spec, you can simply uncomment the line SELENIUM_DRIVER in the .env to not run it headless:

✅ Our first (green) test

We are now going to write a first test to ensure that the whole configuration is working:

• bin/check should be green ✅
• Write the test spec/system/health_spec.rb
• Run bin/check and the test should pass and coverage is 100%.

Commit and push your changes! 🎉

⭐️ The default health check path for Rails is /up. Learn more in the Rails guides.
To customize the health check and add additional checks, you can override the Rails::HealthController class.
You can find an example that also checks the database connection in this file.

Verify

Check that you see a green page in each app.

Heroku

• Open the two apps
  • https://[project-name]-main.herokuapp.com/up
  • https://[project-name]-develop.herokuapp.com/up

Deploio

The host name contains a generated hash. The name can be accessed via:

nctl get applications --project={PROJECT_NAME}

Javascript error reporter

• Create the module spec/support/javascript_error_reporter.rb