Testing Without Rails

Lightning talk about a way to remove the Rails dependency when testing.

Transcript

1. 30 November 2012 Testing Without Rails Daniel Vandersluis
2. 30 November 2012 Testing Without Rails Daniel Vandersluis This is our test suite $ rspec ....................................... … ....................................... Finished in 5 minutes 33.21 seconds 2818 examples, 0 failures, 8 pending That's an average of about 110ms per example!
3. 30 November 2012 Testing Without Rails Daniel Vandersluis Slow Dependencies!
4. 30 November 2012 Testing Without Rails Daniel Vandersluis class CandidateUser < ActiveRecord::Base # ... # lots of other methods def can_apply_to?(job) application = application_for(job) return false if application and application.is_complete? job.applyable? and ( !client.uses_request_for_transfer? or !employee? or !employee.manager.nil? ) end def can_view_internal_jobs? employee? and client.uses_job_posting_types? end end
5. 30 November 2012 Testing Without Rails Daniel Vandersluis require 'spec_helper' describe CandidateUser do let(:client) { Client.make! } let(:job) { Job.make!(client: client) } let(:cand) { CandidateUser.make!(client: client) } let(:application) { JobApplication.make!(job: job, candidate_user: cand) } describe "#can_apply_to?" do context "when the candidate has already applied" do it "should return false if application is complete" do application.update_attributes!(is_complete: true) cand.can_apply_to?(job).should be_false end end it "should return false if the job is not applyable" do # “Applyable”? What determines that? # etc. end end end
6. 30 November 2012 Testing Without Rails Daniel Vandersluis require 'spec_helper' describe CandidateUser do let(:client) { Client.make! } let(:job) { Job.make!(client: client) } let(:cand) { CandidateUser.make!(client: client) } let(:application) { JobApplication.make!(job: job, candidate_user: cand) } describe "#can_apply_to?" do context "when the candidate has already applied" do it "should return false if application is complete" do application.update_attributes!(is_complete: true) cand.can_apply_to?(job).should be_false end end it "should return false if the job is not applyable" do # “Applyable”? What determines that? # etc. end end end
7. 30 November 2012 Testing Without Rails Daniel Vandersluis # spec_helper.rb # When Spork loads... or every run if you're not using it require File.expand_path("../../config/environment", __FILE__) # aka: load all of rails please, kthxbye require 'rspec/rails' require 'shoulda/matchers/integrations/rspec' require 'rspec/autorun' require 'capybara/rspec' require 'capybara/poltergeist' require 'paperclip/matchers' # Each time the test suite is run require Rails.root.join("spec/support/blueprints.rb") Dir[Rails.root.join("spec/support/*.rb")].each { |f| require f } Dir[Rails.root.join("spec/shared_examples/*.rb")].each { |f| require f } That's a lot of dependencies!
8. 30 November 2012 Testing Without Rails Daniel Vandersluis Object Composition “The parts that make up the whole”
9. 30 November 2012 Testing Without Rails Daniel Vandersluis require 'singleton' class CandidateAbilities include Singleton attr_accessor :candidate def can_apply_to?(job) application = candidate.application_for(job) return false if application and application.is_complete? job.applyable? and ( !job.client.uses_request_for_transfer? or !candidate.employee? or !candidate.employee.manager.nil? ) end def can_view_internal_jobs? candidate.employee? and candidate.client.uses_job_posting_types? end end
10. 30 November 2012 Testing Without Rails Daniel Vandersluis class CandidateUser < ActiveRecord::Base def abilities CandidateAbilities.instance.tap do |cp| cp.candidate = self end end delegate :can_apply_to?, :can_view_internal_jobs?, to: :abilities end if current_user.can_apply_to?(job) # ... end if current_user.can_view_internal_jobs? # ... end
11. 30 November 2012 Testing Without Rails Daniel Vandersluis require 'unit_helper' describe CandidateAbilities do let(:candidate) { double("CandidateUser") } let(:client) { double("Client", uses_request_for_transfer?: false) } subject do CandidateAbilities.instance.tap do |cp| cp.candidate = candidate end end before { candidate.stub(:client).and_return(client) } describe "#can_view_internal_jobs?" do before do candidate.stub(:employee?) { true } candidate.client.stub(:uses_job_posting_types?) { true } end it "should return false if the user is not an employee" do candidate.stub(:employee?) { false } subject.can_view_internal_jobs?.should be_false end
12. 30 November 2012 Testing Without Rails Daniel Vandersluis # ... con't it "should return false if the client does not use job posting types" do candidate.client.stub(:uses_job_posting_types?) { false } subject.can_view_internal_jobs?.should be_false end it "should return true otherwise" do subject.can_view_internal_jobs?.should be_true end end
13. 30 November 2012 Testing Without Rails Daniel Vandersluis describe CandidateAbilites do let(:candidate) { double("CandidateUser") } let(:client) { double("Client", uses_request_for_transfer?: false) } let(:job) { double("Job", client: client, applyable?: true) } subject do CandidateAbilities.instance.tap do |cp| cp.candidate = candidate end end before do candidate.stub(:client).and_return(client) candidate.stub(:application_for).with(job). and_return(double("JobApplication", is_complete?: false)) end describe "#can_apply_to?" do # ... end end
14. 30 November 2012 Testing Without Rails Daniel Vandersluis Blazing Speed! $ rspec spec/models/unit/ ................................................ Finished in 0.01754 seconds 48 examples, 0 failures About one-tenth of the time it takes to run one average example!
15. 30 November 2012 Testing Without Rails Daniel Vandersluis Reality Coverage Cucumber to the rescue!
16. 30 November 2012 Testing Without Rails Daniel Vandersluis Scenario: Applying to a job Given I am a candidate And there is an open job When I view that job's details Then I should see an apply button Scenario: The job is not accepting applications Given I am a candidate And there is an inactive job When I view that job's details Then I should not see an apply button Scenario: Employee without a manager Given I am an employee And my company allows transfer requests And there is an open job But I do not have a manager When I view that job's details Then I should not see an apply button
17. 30 November 2012 Testing Without Rails Daniel Vandersluis Addendum: ActiveRecord
18. 30 November 2012 Testing Without Rails Daniel Vandersluis Addendum: ActionPack
19. 30 November 2012 Testing Without Rails Daniel Vandersluis Resources Your Objects, the Unix Way - John Pignata http://blog.codeclimate.com/blog/2012/11/28/your-objects-the-unix-way Making Little Classes out of Big Ones – Avdi Grimm http://devblog.avdi.org/2012/05/25/making-little-classes-out-of-big-ones-video/ Fast Rails Tests – Corey Haines http://www.confreaks.com/videos/641 Refactoring from Good to Great – Ben Orenstein http://www.confreaks.com/videos/1233 Go Ahead, Make a Mess – Sandi Metz http://www.confreaks.com/videos/1253
20. 30 November 2012 Testing Without Rails Daniel Vandersluis Questions? Thanks! Slides available at https://speakerdeck.com/dvandersluis/testing-without-rails