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Generating PDF-417 2d barcode in Font tests, 18 assertions, 0 failures, 0 errors, 0 skips

1 tests, 18 assertions, 0 failures, 0 errors, 0 skips
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Great and you ve just tested the whole stack from dispatcher to database. Not too shabby, is it If you re thinking that what you ve just done looks a lot like you re telling a story (Eugene logs in, Eugene creates article, Eugene logs out), you re right.
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Story-Based Testing
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Integration tests are great for creating story-based scenarios using a domain-specific language (DSL). They even go so far as to allow you to test multiple users interacting! What are story-based tests Well, suppose you could do something like this: test "creating an article" do eugene = registered_user eugene.logs_in 'eugene', 'secret' eugene.creates_article eugene.logs_out end Here, you re telling an easy-to-understand story that requires no programming knowledge to follow. Eugene logs in and proceeds to create a new article. When he is finished, he logs out. Behind the scenes, you can test every request, response, and redirect, following Eugene s path through the entire process, just as you did in the test "should login create article and logout" case. Integration tests provide a method called open_session that you can use to simulate a distinct user interacting with the application as if from a web browser. Although this lets you simulate multiple connections with ease, you use it to help create an object on which to define your custom story-based methods, like logs_in and creates_article. Let s reshape test "should login create article and logout" into methods you can add straight onto a new session object. Listing 10-23 shows the updated user_stories_test.rb test. Listing 10-23. Updated User Stories Integration Test in test/integration/user_stories_test.rb: http://gist.github.com/358423 require 'test_helper' class UserStoriesTest < ActionDispatch::IntegrationTest fixtures :all test "creating an article" do eugene = registered_user eugene.logs_in 'eugene@example.com', 'secret' eugene.creates_article :title => 'Integration tests', :body => 'Lorem Ipsum...' eugene.logs_out end private def registered_user open_session do |user| def user.logs_in(email, password) get login_path assert_response :success
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assert_template 'new' post session_path, :email => email, :password => password assert_response :redirect assert_redirected_to root_path follow_redirect! assert_response :success assert_template 'index' assert session[:user_id] end def user.logs_out get logout_path assert_response :redirect assert_redirected_to root_path assert_nil session[:user] follow_redirect! assert_template 'index' end def user.creates_article(article_hash) get new_article_path assert_response :success assert_template 'new' post articles_path, :article => article_hash assert assigns(:article).valid assert_response :redirect assert_redirected_to article_path(assigns(:article)) follow_redirect! assert_response :success assert_template 'show' end end end end See how you create a private method called registered_user and create a new integration session inside it The open_session method yields a session object onto which you attach singleton methods (methods that exist only on a particular instance):
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def registered_user open_session do |user| def user.logs_in(email, password) #... end def user.logs_out #... end def user.creates_article(article_hash) #... end end end The return value of registered_user, then, is a fresh integration session object that responds to the methods you ve created. This means you can create as many user sessions as you want and simulate multiple connections to the application. Listing 10-24 updates the test "creating an article" method and renames it test "multiple users creating an article". Listing 10-24. Updated Article-Creation Story Testing Multiple Users in test/integration/user_stories_test.rb: http://gist.github.com/358424 require 'test_helper' class UserStoriesTest < ActionDispatch::IntegrationTest fixtures :all test "multiple users creating an article" do eugene = registered_user lauren = registered_user eugene.logs_in 'eugene@example.com', 'secret' lauren.logs_in 'lauren@example.com', 'secret' eugene.creates_article :title => 'Integration Tests', :body => 'Lorem Ipsum...' lauren.creates_article :title => 'Open Session', :body => 'Lorem Ipsum...' eugene.logs_out lauren.logs_out end private def registered_user open_session do |user| def user.logs_in(email, password) get login_path assert_response :success assert_template 'new'
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post session_path, :email => email, :password => password assert_response :redirect assert_redirected_to root_path follow_redirect! assert_response :success assert_template 'index' assert session[:user_id] end def user.logs_out get logout_path assert_response :redirect assert_redirected_to root_path assert_nil session[:user] follow_redirect! assert_template 'index' end def user.creates_article(article_hash) get new_article_path assert_response :success assert_template 'new' post articles_path, :article => article_hash assert assigns(:article).valid assert_response :redirect assert_redirected_to article_path(assigns(:article)) follow_redirect! assert_response :success assert_template 'show' end end end end This is only the tip of the iceberg. The sky is the limit for how creative you can get with this style of testing.
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