RSpec + Rails Without rspec-rails @ RoRoSyd November 2015

Transcript

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   @JonRowe RSPEC + RAILS Without rspec-rails

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   History 2179 commits, 194 people since 2009 Thin wrapper over

   Rails helpers
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   Why Rails is integrated Rails is opinionated Rails is slow(er)

   to boot
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   How Load components of Rails as needed Change how we

   test
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   How PORO Specs Model Specs Controller Specs Acceptance / Feature

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

   can be painful Rails constant lookup can be surprising
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   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!
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   PORO Specs Plain old Ruby specs No change!

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

   `describe Model`
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    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
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    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
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    # 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
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    Controller Specs Don’t

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    Controller Specs

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    Controller Specs Controller specs are already fullstack Too hard to

    isolate them Refactor logic to services and test or… Write acceptance tests
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    Acceptance Specs Are still (as slow as) Rails Partition from

    your suite
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    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
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    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
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    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
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    Other Services / Presenters / Forms / ETC As long

    as they’re PORO(ish), work fine Mailers work with `email_spec`
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    Other View / Request / Etc Not SRP, write acceptance

    specs or… Use `rspec-rails`
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    THANKS @JONROWE

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