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CHAPTER 9 TESTING YOUR APPLICATION
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The mocks directory is used to store classes that will be used in place of actual classes while your tests are running. For example, let s say you have a CreditCard class that processes credit card transactions. You probably don t want to actually process live transactions in your tests, so you can mock the CreditCard class and have it stand in for the actual class. For more information about mocks (and their counterparts, stubs), check out the following links: http://en.wikipedia.org/wiki/Mock_object http://martinfowler.com/articles/mocksArentStubs.html You may remember that every time we generated a model or a controller while building the events application, Rails automatically generated test files for us. This is another example of its opinionated nature Rails thinks you should test, so it goes out of its way to remind you. You might also remember that when we originally created the databases for the events application, we created three: one for development (which is all we ve been using thus far), one for production, and one for testing. Not surprisingly, Rails uses the testing database just for testing. If you didn t create the test database back in 3, you can create it now by using the following command:
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$ mysqladmin -uroot create events_test
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Rails will drop and re-create this test database on every run of the test suite, so 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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So, you know that Rails generated some tests automatically. Let s open one of them now and take a look. We ll start with the Event test, located in test/unit/event_test.rb, as shown in Listing 9-1.
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Listing 9-1. Generated Event Unit Test, in test/unit/event_test.rb
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require File.dirname(__FILE__) + '/../test_helper' class EventTest < Test::Unit::TestCase fixtures :events
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CHAPTER 9 TESTING YOUR APPLICATION
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# Replace this with your real tests. def test_truth assert true end end
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While 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 Ruby s built-in testing framework, Test::Unit. The fixtures class method makes available the given fixtures. In this case, we re loading the events fixture, providing access to the test data in test/fixtures/ events.yml. Tests are implemented as methods prefixed with test_. Within a test case, assertions are used to test expectations. We ll explain how these work in the Testing with Assertions section coming up shortly. If you peek inside the test/unit directory, you ll see a similar test case for every model we ve generated so far: Event, EventMailer, User, and Registration. Each looks almost exactly the same as the Event test. Let s run the unit tests now and see what happens.
$ rake test:units
Loaded suite /usr/local/lib/ruby/gems/1.8/gems/rake0.7.2/lib/rake/rake_test_loader Started .... Finished in 0.053392 seconds. 4 tests, 4 assertions, 0 failures, 0 errors
Take a closer look at the output. If a test case passes, as each did this time, you ll see a . (dot) character. When the test case produces an error, you ll see an E. If any assertion fails to return true, you ll see an F. Finally, when the test suite is finished, it prints a summary.
CHAPTER 9 TESTING YOUR APPLICATION
Note If you get an error like Mysql::Error:
Unknown database 'events_test' when you run rake test:units, you probably didn t create your test database.
Testing the Event Model
Let s test the Event model. If you recall from 4, one of the first things we did with our Event model was basic CRUD operations. Well, testing that we can create, read, update, and delete events is a great place to start. So, let s make a quick summary of the specific things we re going to test: Creating a new event Finding an event Updating an event Destroying an event Before we get started, we need to create a few fixtures (remember that a fixture is a textual representation of test data).
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