rails-template/rspec/rails_helper.rb

module Rspec
  def rails_helper_configurations
    file 'spec/rails_helper.rb', <<~CODE

      # This file is copied to spec/ when you run 'rails generate rspec:install'

      # This file is copied to spec/ when you run 'rails generate rspec:install'
      require 'spec_helper'
      require 'helpers/base'
      require 'helpers/jsonapi_wrapper_for_factories'
      require 'helpers/swagger_errors'

      ENV['RAILS_ENV'] ||= 'test'
      require File.expand_path('../config/environment', __dir__)
      # Prevent database truncation if the environment is production
      abort('The Rails environment is running in production mode!') if Rails.env.production?
      require 'rspec/rails'
      # Add additional requires below this line. Rails is not loaded until this point!
      Dir[Rails.application.root + "/lib/swagger/*.rb"].each { |file| require file }

      # Requires supporting ruby files with custom matchers and macros, etc, in
      # spec/support/ and its subdirectories. Files matching `spec/**/*_spec.rb` are
      # run as spec files by default. This means that files in spec/support that end
      # in _spec.rb will both be required and run as specs, causing the specs to be
      # run twice. It is recommended that you do not name files matching this glob to
      # end with _spec.rb. You can configure this pattern with the --pattern
      # option on the command line or in ~/.rspec, .rspec or `.rspec-local`.
      #
      # The following line is provided for convenience purposes. It has the downside
      # of increasing the boot-up time by auto-requiring all files in the support
      # directory. Alternatively, in the individual `*_spec.rb` files, manually
      # require only the support files necessary.
      #
      # Dir[Rails.root.join('spec', 'support', '**', '*.rb')].sort.each { |f| require f }

      # Checks for pending migrations and applies them before tests are run.
      # If you are not using ActiveRecord, you can remove these lines.
      begin
        ActiveRecord::Migration.maintain_test_schema!
      rescue ActiveRecord::PendingMigrationError => e
        puts e.to_s.strip
        exit 1
      end
      RSpec.configure do |config|
        # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
        config.fixture_path = ::Rails.root + '/spec/fixtures'

        # If you're not using ActiveRecord, or you'd prefer not to run each of your
        # examples within a transaction, remove the following line or assign false
        # instead of true.
        # config.use_transactional_fixtures = true

        # The different available types are documented in the features, such as in
        # https://relishapp.com/rspec/rspec-rails/docs
        config.infer_spec_type_from_file_location!

        # Filter lines from Rails gems in backtraces.
        config.filter_rails_from_backtrace!

        config.include FactoryBot::Syntax::Methods
        config.include Helpers
      end

      Shoulda::Matchers.configure do |config|
        config.integrate do |with|
          with.test_framework :rspec
          with.library :rails
        end
      end
    CODE
  end
end