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TESTING YOUR APPLICATION
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hashed_password: 'e5e9fa1ba31ecd1ae84f75caaa474f3a663f05f4' # => secret lauren: email: 'lauren@example.com' hashed_password: 'e5e9fa1ba31ecd1ae84f75caaa474f3a663f05f4' # => secret The performances directory is used to store performance tests. They re basically integration tests that run a code profiler on your tests; the results of those tests are outputted to the tmp/performance directory. Remember that every time you generated a model or a controller while building the blog application, Rails automatically generated test files for you. This is another example of its opinionated nature Rails thinks you should test, so it goes out of its way to remind you. You may also remember that Rails created three SQLite databases for the blog application: one for development (which is all you ve been using thus far), one for production, and one for testing. Not surprisingly, Rails uses the testing database just for testing. Rails drops and re-creates this test database on every run of the test suite. Make sure you don t list your development or production database in its place, or all your data will be gone.
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Unit Testing Your Rails Application
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You know that Rails generated some tests automatically. Let s open one of them now and take a look. Start with the Article test, located in test/unit/article_test.rb, as shown in Listing 10-3. Listing 10-3. Generated Article Unit Test, in test/unit/artilce_test.rb require 'test_helper' class ArticleTest < ActiveSupport::TestCase # Replace this with your real tests. test "the truth" do assert true end end Although there s not much to it (all it does is test that true is, in fact, true), this test gives you a template from which to build your real tests. It has the following elements: The test class is a subclass of Rails enhanced version of Ruby s built-in testing framework, Test::Unit. It s called ActiveSupport::TestCase. Tests are implemented as blocks using the test method, with the first parameter as the description of that test "the truth" in this case. Within a test case, assertions are used to test expectations. The Testing with Assertions section explains how these work.
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If you peek inside the test/unit directory, you see a similar test case for every model you ve generated so far: Article, Comment, Category, User, and Profile. You also see a test for CommentObserver. Each looks almost exactly the same as the Article test. Let s run the unit tests now using the rake test:units command from your command prompt, and see what happens:
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TESTING YOUR APPLICATION
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$ rake test:units Loaded suite Started ...... Finished in 0.115422 seconds.
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6 tests, 6 assertions, 0 failures, 0 errors, 0 skips Take a closer look at the output. If a test case passes, as each did this time, you see a . (dot) character. When the test case produces an error, you see an E. If any assertion fails to return true, you see an F. Finally, when the test suite is finished, it prints a summary.
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Testing the Article Model
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Let s test the Article model. If you recall from 4, one of the first things you did with your Article model was basic CRUD operations. Well, testing that you can create, read, update, and delete articles is a great place to start. Here s a quick summary of the specific things you test in this chapter: Creating a new article Finding an article Updating an article Destroying an article
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Before you begin, you need to create a few fixtures (remember that a fixture is a textual representation of test data).
Creating Fixtures
You create fixtures for articles. Open the test/fixtures/articles.yml file, and replace its content with the code as shown in Listing 10-4. Listing 10-4. Articles Fixtures in test/fixtures/articles.yml: http://gist.github.com/358400 welcome_to_rails: user: eugene title: "Welcome to Rails" body: "Rails is such a nice web framework written in Ruby" published_at: <%= 3.days.ago %>
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