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assert_equal ["can't be blank"], article.errors[:title] assert_equal ["can't be blank"], article.errors[:body] Finally, you assert that article.save returns false using !article.save. Run the test one more time: $ ruby -Itest test/unit/article_test.rb Loaded suite test/unit/article_test Started ..... Finished in 0.304773 seconds. 5 tests, 10 assertions, 0 failures, 0 errors, 0 skips Feels good, doesn t it Life isn t all roses, though, and requirements change. What if one day you decide to make a change to the Article model and remove the validation requirements for the title attribute If that were to happen, your test would fail. If you want to try it, open the Article model in app/models/article.rb, and remove validates :title, :presence => true, and then run the tests again. When your requirements change, you often need to update your tests. We recommend updating the tests first (which should make them fail) and then updating your code (which makes them pass). This is also knows as Test Driven Development (TDD).
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Functional Testing Your Controllers
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Tests to check your controllers are called functional tests. When you tested your models, you didn t test them in the context of the web application there were no web requests and responses, nor were there any URLs to contend with. This focused approach lets you home in on the specific functionality of the model and test it in isolation. Alas, Rails is for building web applications; and although unit-testing models is important, it s equally important to test the full request/response cycle.
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Testing the Articles 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; those objects act just like the live requests and responses you get when running the application via a web server. If you open the articles controller test in test/functional/articles_controller_test.rb and examine the first few lines, as shown in Listing 10-10, you can see how this is done. Listing 10-10. Setup of a Functional Test in test/functional/articles_controller_test.rb require 'test_helper'
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TESTING YOUR APPLICATION
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class ArticlesControllerTest < ActionController::TestCase # ... end Just as in the unit test, the first thing you do is require the test_helper. The test_helper.rb file sets up some common environment variables and generally endows Test::Unit with specific methods that make testing Rails applications easier.
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NOTE You can think of test_helper as being akin to application_helper. Any methods you define here are available to all your tests.
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Notice that ArticlesControllerTest is actually a subclass of ActionController::TestCase, which performs some magic for you behind the scenes. It prepares three instance variables for you to use in your tests: the first is @controller as an instance variable of ArticlesController, after which it instantiates both @request and @response variables, 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 re designed to simulate the Action Controller environment as closely as possible. Most of the time, you don t need to worry about all this. Still, it s important to know what s going on. Because the test you re looking at was created by the scaffold generator, it has quite a bit more code than you would get from the standard controller generator. There s a problem with this code, though: not all the test cases will pass at least, not without some modification. Warts and all, this gives you a good start and serves well as a template. As you look over the articles controller functional test file, notice that each test case tests a specific request for an action on the controller. There s a test for every action: index, show, new, create, edit, update, and destroy. Let s walk through each test case, making adjustments as you go.
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