BDD with Cucumber and RSpec. Marcus Ahnve Valtech

Transcription

1 BDD with Cucumber and RSpec Marcus Ahnve Valtech

2 Software Developer Polyglot Programmer About me

3 Q: How many are using Cucumber

4 Q: How many have heard of Cucumber

5 Q: How many are using RSpec

6 Q: How many have heard of RSpec

7 Q: How many are doing TDD/BDD?

8 Q: How many think I am asking too many questions?

9 My BDD history Java and Ruby developer TestDox, Joe Walnes Dan North Dave Astels, Aslak Hellesøy, David Chelimsky

10 $ rake Finished in seconds 285 examples, 0 failures 152 scenarios (152 passed) 1363 steps (1363 passed) 4m4.505s Finished in 8.06 seconds 77 examples, 0 failures

11 Why automatic testing? Make sure it works now Make sure it works whenever

12 Why TDD? Make sure it works now Make sure it works whenever Know when you're done

13 Method Testing class Klazz def method do_something end end class KlazzTest def = Klazz.new end def test_method result assert_equal("expected", result) end end

14 The Context Problem class KlazzTest def = Klazz.new end def test_method result assert_equal(:expected, result) end def test_another_context klazz = Klazz.new(:constructor_args) assert_equal(:expected_2, klazz.do_something) end end

15 Why BDD? Make sure it works now Make sure it works whenever Know when you're done Build just what's needed Design from functionality Documentation - why

16 What is BDD? "BDD is TDD done right" "TDD means 'write the test first'. BDD takes this idea to a more general level: 'write the client first' (the outside)" - Aslak Hellesøy

17 The BDD Flow Write a failing feature Implement feature 0.. * Implement spec Write a failing spec

18 $ rails new blog -T create create README create Rakefile create config.ru create.gitignore create Gemfile create app create app/controllers/application_controller.rb... create vendor/plugins/.gitkeep

19 source ' gem 'rails', '3.0.0' gem 'sqlite3-ruby', :require => 'sqlite3' group :test do gem 'rspec-rails' gem 'cucumber-rails' gem 'capybara' end

20 $ bundle install master(mon,apr04) Fetching source index for Using rake (0.8.7)... Installing rack (1.2.2) Installing rack-mount (0.6.14)... Installing gherkin (2.3.5) with native extensions Installing term-ansicolor (1.0.5) Installing cucumber (0.10.2) Installing cucumber-rails (0.4.0)... Installing rspec (2.5.0) Installing rspec-rails (2.5.0) Using sqlite3 (1.3.3) Using sqlite3-ruby (1.3.3)

21 $ rake db:migrate

22 $ rails generate cucumber:install create config/cucumber.yml create script/cucumber chmod script/cucumber create features/step_definitions create features/step_definitions/web_steps.rb create features/support create features/support/paths.rb create features/support/selectors.rb create features/support/env.rb exist lib/tasks create lib/tasks/cucumber.rake gsub config/database.yml gsub config/database.yml force config/database.yml

23 $ rails generate rspec:install master(mon,apr04) create.rspec create spec create spec/spec_helper.rb

24 Feature: User writes blog post In order for other people to read brilliant thoughts A user can post a blog post Scenario: Given I am on the new blog post page When I write a blog post And it has the title "My great Idea" And it has the body "Body body body" And I press "Save" Then I should see "My great Idea"

25 $ rake 1 scenario (1 failed) 6 steps (1 failed, 2 skipped, 3 undefined) 0m1.103s You can implement step definitions for undefined steps with these snippets:

26 When /^I write a blog post$/ do pending # express the regexp above with the code you wish you had end When /^it has the title "([^"]*)"$/ do arg1 pending # express the regexp above with the code you wish you had end When /^it has the body "([^"]*)"$/ do arg1 pending # express the regexp above with the code you wish you had end

27 $ rake Given I am on the new blog post page # features/step_definitions/web_steps.rb:44 Can't find mapping from "the new blog post page" to a path. Now, go and add a mapping in /home/mahnve/src/presentations/cucumber/src/blog/features/su

28 module NavigationHelpers def path_to(page_name) case page_name when /the home\s?page/ '/' when /the new blog post page/ '/blog_posts/new'

29 $ rake Scenario: # features/user_writes_blogpost.feature:6 Given I am on the new blog post page # features/step_definitions/web_steps.rb:44 No route matches "/blogpost/new" (ActionController::RoutingError)

30 $ rails generate resource BlogPost title:string body:string invoke active_record create db/migrate/ _create_blog_posts.rb create app/models/blog_post.rb invoke test_unit create test/unit/blog_post_test.rb create test/fixtures/blog_posts.yml invoke controller create app/controllers/blog_posts_controller.rb invoke erb create app/views/blog_posts invoke test_unit create test/functional/blog_posts_controller_test.rb invoke helper create app/helpers/blog_posts_helper.rb invoke test_unit create test/unit/helpers/blog_posts_helper_test.rb route resources :blog_posts

31 $ rake (in /home/mahnve/src/presentations/cucumber/src/blog) You have 1 pending migrations: CreateBlogPosts

32 class CreateBlogPosts < ActiveRecord::Migration def self.up create_table :blog_posts do t t.string :title t.string :body t.timestamps end end def self.down drop_table :blog_posts end end

33 $ rake db:migrate (in /home/mahnve/src/presentations/cucumber/src/blog) == CreateBlogPosts: migrating ====================================== -- create_table(:blog_posts) -> s == CreateBlogPosts: migrated (0.0010s) ================================

34 $ rake Given I am on the new blog post page # features/step_definitions/web_steps.rb:44 The action 'new' could not be found for BlogPostsController (AbstractController::ActionNotFound

35 gem 'inherited_resources'

36 class BlogPostsController < InheritedResources::Base end

37 $ rake Missing template blog_posts/new with...

38 gem 'formtastic' gem 'haml'

39 - do form = form.inputs = form.buttons

40 $ rake Given I am on the new blog post page # features/step_definitions/web_steps.rb:44 When I write a blog post # features/step_definitions/blogpost_steps.rb:1 TODO (Cucumber::Pending)./features/step_definitions/blogpost_steps.rb:2:in `/^I write a blog post$/'

41 Oops Steps where not really optimal

42 When /^I write a blog post with title "([^"]*)" and the body "([^"]*)"$/ do fill_in 'Title', :with => title fill_in 'Body', :with => body end

43 Given I am on the new blog post page When I write a blog post with title "My great Idea" and body "Body body body" And I press "Create Blog post" Then I should see "My great Idea"

44 $ rake... Missing template blog_posts/show

45

46 Scenario: Create without title Given I am on the new blog post page When I write a blog post without a title And I press "Create Blog post" Then I should see "can't be blank"

47 $ rake Then I should see "Required" # features/step_definitions/web_steps.rb:105 expected #has_content?("required") to return true, got false (RSpec::Expectations::Expectatio

48 require 'spec_helper' describe BlogPost do it {should validate_presence_of :title} end

49 group :test, :development do gem 'rspec-rails' end group :test do gem 'cucumber-rails' gem 'capybara' gem 'database_cleaner' gem 'shoulda-matchers' end

50 $ rake 1) BlogPost Failure/Error: it {should validate_presence_of :title} Expected errors to include "can't be blank" when title is set to nil, got no errors

51 class BlogPost < ActiveRecord::Base validates_presence_of :title end

52 $ rake. Finished in seconds 1 example, 0 failures 2 scenarios (2 passed) 8 steps (8 passed) 0m1.084s

53 Java package cukes; import cuke4duke.annotation.i18n.en.given; public class BlogPostSteps write a blog post with title \\"([^\\"]*)\\" and body \\"([^\\"]*)\\ public void writeblogpost (String title, String body) {... } }

54 Groovy this.metaclass.mixin(cuke4duke.groovydsl) Given(~/^I write a blog post with title "([^"]*)" and body "([^"]*)"$/) { String title, String body... }

55 Thank You!