Factory Girl - Gabe Evans

Transcript

1. Factory Girl A Brief Introduction Using Ruby on Rails

2. What’s Factory Girl?

3. A Replacement for Fixtures

4. Provides a Simple DSL

5. Keeps Tests Focused & Readable

6. Builds Objects Instead of Database Records

7. Installation

8. Gemfile

9. group :development, :test do gem ‘factory_girl_rails’ end Gemfile

10. $ bundle install

11. Defining a Factory

12. spec/factories/

13. spec/factories/users.rb

14. spec/factories/posts.rb

15. spec/factories/comments.rb

16. spec/factories/products.rb

17. spec/factories/users.rb

18. FactoryGirl.define do factory :user do name ‘Joe Blow’ email ‘joe.blow@gmail.com’

    password ‘p@ssw0rd’ admin false end end spec/factories/users.rb

19. spec/models/user_spec.rb

20. describe User do end spec/models/user_spec.rb

21. describe User do subject { FactoryGirl.create(:user) } end spec/models/user_spec.rb

22. describe User do subject { FactoryGirl.create(:user) } its(:name) { should

    == ‘Joe Blow’ } end spec/models/user_spec.rb

23. describe User do subject { FactoryGirl.create(:user) } its(:name) { should

    == ‘Joe Blow’ } its(:email) { should == ‘joe.blow@gmail.com’ } end spec/models/user_spec.rb

24. describe User do subject { FactoryGirl.create(:user) } its(:name) { should

    == ‘Joe Blow’ } its(:email) { should == ‘joe.blow@gmail.com’ } it { should_not be_admin } end spec/models/user_spec.rb

25. FactoryGirl.create(:user)

26. FactoryGirl.build(:user)

27. FactoryGirl.build_stubbed(:user)

28. spec/spec_helper.rb

29. RSpec.configure do |config| config.include FactoryGirl::Syntax::Methods end spec/spec_helper.rb

30. FactoryGirl.create(:user)

31. create(:user)

32. build(:user)

33. build_stubbed(:user)

34. spec/models/user_spec.rb describe User do subject { create(:user) } its(:name) {

    should == ‘Joe Blow’ } its(:email) { should == ‘joe.blow@gmail.com’ } it { should_not be_admin } end

35. Overriding Attributes

36. spec/models/user_spec.rb context ‘a duplicate email address’ do it { should_not

    be_valid } end

37. context ‘a duplicate email address’ do let(:user) { create(:user) }

    subject { User.new(name: ‘Joe Duplicate’, email: user.email, password: ‘test123’) } it { should_not be_valid } end spec/models/user_spec.rb

38. context ‘a duplicate email address’ do let(:user) { create(:user) }

    subject { build(:user, email: user.email) } it { should_not be_valid } end spec/models/user_spec.rb

39. Lazy Attributes

40. spec/factories/posts.rb FactoryGirl.define do factory :post do title ‘Worst presentation EVER!’

    content “Gabe’s presentations are long-winded. After the first 40 slides I passed out.” published_at { Time.now } end end

41. Sequences

42. FactoryGirl.define do sequence :email do |n| “person#{n}@example.com” end end spec/factories/sequences.rb

43. Traits

44. Associations

45. Dependent Attributes

46. Transient Attributes

47. Creating or Building Multiple Objects

48. Callbacks

49. A Real World Scenario

50. Wrapping Up...

51. Questions?

52. *applause*