RSpec + Rails Without rspec-rails @ RoRoSyd November 2015

Transcript

1. @JonRowe RSPEC + RAILS Without rspec-rails

2. History 2179 commits, 194 people since 2009 Thin wrapper over

   Rails helpers

3. Why Rails is integrated Rails is opinionated Rails is slow(er)

   to boot

4. How Load components of Rails as needed Change how we

   test

5. How PORO Specs Model Specs Controller Specs Acceptance / Feature

   Specs Other Specs

6. Autoloading To autoload or not to autoload. `require` works… but

   can be painful Rails constant lookup can be surprising

7. require 'bundler/setup' gem_paths = Dir[ File.join Bundler.bundle_path, “/gems/**/lib” ] app_paths

   = Dir[ File.expand_path(‘./lib/**'), File.expand_path(‘./app/**') ] (gem_paths + app_paths).each do |path| ActiveSupport::Dependencies .autoload_paths << File.expand_path(path) end ActiveSupport::Dependencies.hook!

8. PORO Specs Plain old Ruby specs No change!

9. Model Specs Need to load the database beforehand Don’t use

   `describe Model`

10. module Support::Database def self.setup! return true if defined?(@connection) require ‘yaml’;

    require ‘active_record' config = YAML.load(ERB.new( IO.read(‘config/database.yml') ).result) @connection = ActiveRecord::Base .establish_connection(config[‘test']) ActiveRecord::Base .raise_in_transactional_callbacks = true true end end RSpec.configuration.before :context, :db do Support::Database.setup! end

11. RSpec.describe 'MyModel', :db do let(:models) do (1..6).map { |i| MyModel.create!

    hidden: false } end describe '.active' do it 'returns all active models' do models[0..2].each do |model| model.update_attributes! hidden: tru end expect( MyModel.active ).to match_array models[3..-1] end end end

12. # For verified doubles with ActiveRecord ::RSpec::Mocks.configuration .when_declaring_verifying_double do |possible|

    target = possible.target if target.respond_to?(:define_attribute_methods) possible.target.define_attribute_methods end end

13. Controller Specs Don’t

14. Controller Specs

15. Controller Specs Controller specs are already fullstack Too hard to

    isolate them Refactor logic to services and test or… Write acceptance tests

16. Acceptance Specs Are still (as slow as) Rails Partition from

    your suite

17. require 'capybara/dsl' RSpec.configure do |config| config.include Capybara::DSL, :app config.before :context,

    :app do unless Capybara.app require ‘config/environment.rb’ Capybara.app = Rails.application end Capybara.asset_host = "http://localhost:#{ENV['PORT'] || '8080'}" end config.after :example, :app do Capybara.reset_sessions! end end

18. RSpec.describe 'Downloading a report', :app, :db do include Support::AdminHelper before

    do sign_in_as a_valid_admin end context 'when statistics are present' do it 'produces a csv' do visit "/admin" click_link 'Download CSV' expect { CSV.parse body }.to_not raise_error CSV::ParseError end end end

19. RSpec.configure do |config| config.register_ordering :global do |examples| acceptance, unit =

    examples.partition do |ex| ex.metadata[:acceptance] end unit.shuffle + acceptance.shuffle end end

20. Other Services / Presenters / Forms / ETC As long

    as they’re PORO(ish), work fine Mailers work with `email_spec`

21. Other View / Request / Etc Not SRP, write acceptance

    specs or… Use `rspec-rails`

22. THANKS @JONROWE

23. CODE https://gist.github.com/JonRowe/867423bab8201b1f852b