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