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CHAPTER 9 TESTING YOUR APPLICATION
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Eugene s path through the entire process, just as we did in the test_should_login_ create_event_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. While this lets you simulate multiple connections with ease, we re using it to help us create an object on which to define our custom story-based methods, like logs_in and creates_event. Let s reshape our test_should_login_create_event_and_logout into methods we can add straight onto a new session object. Listing 9-21 shows the updated user_stories test. Listing 9-21. Updated User Stories Integration Test, in test/integration/user_stories_test.rb
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require "#{File.dirname(__FILE__)}/../test_helper" class UserStoriesTest < ActionController::IntegrationTest fixtures :users, :events def test_creating_an_event eugene = registered_user eugene.logs_in 'eugene', 'secret' eugene.creates_event :title => 'BBQ', :location => 'My back yard' eugene.logs_out end private def registered_user open_session do |user| def user.logs_in(login, password) get '/login' assert_response :success assert_template 'login' post '/login', :login => login, :password => password assert_response :redirect assert_redirected_to :controller => 'events' follow_redirect! assert_response :success assert_template 'index' assert session[:user_id] end
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def user.logs_out get '/logout' assert_response :redirect assert_redirected_to :action => 'login' assert_nil session[:user] follow_redirect! assert_template 'login' end def user.creates_event(event_hash) get '/events/new' assert_response :success assert_template 'new' post '/events/create', :event => event_hash assert assigns(:event).valid assert_response :redirect assert_redirected_to :action => 'index' follow_redirect! assert_response :success assert_template 'index' end end end end
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See how we ve created a private method called registered_user and created a new integration session inside it The open_session method yields a session object onto which we 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(login, password) #... end
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def user.logs_out #... end def user.creates_event(event_hash) #... end end end
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The return value of the registered_user, then, is a fresh integration session object that responds to the methods we ve created. We know what you re thinking. This means we can create as many user sessions as we want and simulate multiple connections to the application. In Listing 9-22, we ve updated the test_creating_an_event method and renamed it to test_multiple_users_creating_an_event.
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Listing 9-22. Updated Event Creation Story Testing Multiple Users
def test_multiple_users_creating_an_event eugene = registered_user lauren = registered_user eugene.logs_in 'eugene', 'secret' lauren.logs_in 'lauren', 'secret' eugene.creates_event :title => 'Punk Rock Show', :location => 'Bar' lauren.creates_event :title => 'BBQ', :location => 'My back yard' eugene.logs_out lauren.logs_out end
This is only the tip of the iceberg. The sky is the limit on how creative you ll be able to get with this style of testing.
CHAPTER 9 TESTING YOUR APPLICATION
Running the Full Test Suite
Now that we have a respectable amount of tests for our application, let s use Rake to run the entire suite. Since the default Rake task is test, let s save ourselves five keystrokes (a space counts as a keystroke!) and run our tests with just rake.
$ rake
Loaded suite /usr/local/rake/rake_test_loader Started ........ Finished in 0.116108 seconds. 8 tests, 13 assertions, 0 failures, 0 errors Loaded suite /usr/local/rake/rake_test_loader Started ......... Finished in 0.129197 seconds. 9 tests, 26 assertions, 0 failures, 0 errors Loaded suite /usr/local/rake/rake_test_loader Started . Finished in 0.22396 seconds. 1 tests, 40 assertions, 0 failures, 0 errors
Take a moment bask in the glory of a successful test run! Rails includes a handy task to generate a formatted display of stats about your program, including the lines of code (LOC). It s capable of showing you the ratio between your application and test code. Run it using rake stats.
$ rake stats
CHAPTER 9 TESTING YOUR APPLICATION
+----------------------+-------+-------+---------+---------+-----+-------+ | Name | Lines | LOC | Classes | Methods | M/C | LOC/M | +----------------------+-------+-------+---------+---------+-----+-------+ | Controllers | 149 | 119 | 4 | 20 | 5 | 3 | | Helpers | 20 | 16 | 0 | 2 | 0 | 6 | | Models | 106 | 80 | 5 | 11 | 2 | 5 | | Libraries | 0 | 0 | 0 | 0 | 0 | 0 | | Components | 0 | 0 | 0 | 0 | 0 | 0 | | Integration tests | 72 | 51 | 1 | 5 | 5 | 8 | | Functional tests | 132 | 90 | 6 | 15 | 2 | 4 | | Unit tests | 116 | 90 | 5 | 12 | 2 | 5 | +----------------------+-------+-------+---------+---------+-----+-------+ | Total | 595 | 446 | 21 | 65 | 3 | 4 | +----------------------+-------+-------+---------+---------+-----+-------+ Code LOC: 215 Test LOC: 231 Code to Test Ratio: 1:1.1
While the code-to-test ratio is a nice thing to know, it really doesn t tell us all that much. What really matters is how much of the code our tests is exercising. For this kind of analysis, we can use a code coverage tool, like rcov.
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