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Testing the Events Controller
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Functional tests aren t that much different from unit tests. The main difference is that Rails sets up request and response objects for you that act just like the live requests and responses you would get when running the application via a web server. If you open the
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CHAPTER 9 TESTING YOUR APPLICATION
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events controller test in test/functional/events_controller_test.rb and examine the first
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few lines, as shown in Listing 9-9, you can see how this is done.
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Listing 9-9. Setup of a Functional Test, in test/functional/events_controller_test.rb
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require File.dirname(__FILE__) + '/../test_helper' require 'events_controller' # Re-raise errors caught by the controller. class EventsController; def rescue_action(e) raise e end; end class EventsControllerTest < Test::Unit::TestCase fixtures :events, :users def setup @controller = EventsController.new @request = ActionController::TestRequest.new @response = ActionController::TestResponse.new @first_id = events(:first).id end # ... end
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Just as in the unit test, the first thing that we do is require the test_helper. The test_helper.rb file sets up some common environment variables and generally endows Test::Unit with some specific methods that make testing Rails applications easier.
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Note You can think of the test_helper as being akin to the application_helper. Any methods you
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define here will be available to all your tests (since all your tests subclass Test::Unit::TestCase).
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Next, this test requires the events controller itself (require 'events_controller'). Since controllers normally rescue errors to display a backtrace, we quickly reopen the EventsController class and overwrite the rescue_action method so as to make sure it raises any exceptions it encounters (if errors occur, we want to see them while testing). Next, we actually open a class definition for our test, EventsControllerTest, inside which a setup method is defined. It s this setup method that sets up the Action Controller environment, as shown in Listing 9-10.
CHAPTER 9 TESTING YOUR APPLICATION
Listing 9-10. Initializing the Controller Environment, in test/functional/events_controller_test.rb
def setup @controller @request @response @first_id end
= = = =
EventsController.new ActionController::TestRequest.new ActionController::TestResponse.new events(:first).id
We instantiate a new EventsController object and store it in the instance variable @controller. We also create @request and @response variables, each of which are instances of ActionController::TestRequest and ActionController::TestResponse, respectively. As you can no doubt tell by their names, these objects are made specifically for testing, and they are designed to simulate the Action Controller environment as closely as possible. Most of the time, you won t need to worry about doing this setup manually. Whenever you run the controller generator, it will automatically create a functional test file for you and fill in all these details. Still, it s important that you know what s going on. Since the test we re looking at was actually created by the scaffold generator, it has quite a bit more code than you would get from the standard controller generator. There s only one problem with this code, though: not all the test cases will pass at least, not without some modification. Warts and all, this gives us a rather good start and will serve well as a template. As you look over the events controller functional test file, you ll notice that each test case tests a specific request for an action on the controller. In fact, there s a test for every action: index, list, show, new, create, edit, update, and destroy. We ll walk through each test case, making adjustments as we go. We need to make a small change first, though. See the fixture that s being accessed on the last line of the setup method Well, we don t have an events fixture named :first, so we ll have to fix that. Change the name of the fixture to :tiki_party as follows:
@first_id = events(:tiki_party).id
Creating a Test Helper
Before we get to testing our actions, a little foresight tells us that in order to create an event, our application expects a logged-in user. So, we ll need to simulate a logged-in user for our tests. This is a perfect job for a test helper. What we can do is create a helper method called login_as that accepts the name of the user to log in as. This method can set up the session object, just like our controller expects. We'll be able to use this method for any test case that requires a login.
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