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Creating Fixtures
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We ll create fixtures for both users and events. Open the test/fixtures/users.yml file and add a couple of users to it, as shown in Listing 9-2.
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Listing 9-2. Users Fixture, test/fixtures/users.yml
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eugene: id: 1 login: 'eugene' email: 'eugene@example.com' hashed_password: 'e5e9fa1ba31ecd1ae84f75caaa474f3a663f05f4' # => secret lauren: id: 2 login: 'lauren' email: 'lauren@example.com' hashed_password: 'e5e9fa1ba31ecd1ae84f75caaa474f3a663f05f4' # => secret
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CHAPTER 9 TESTING YOUR APPLICATION
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Next, open the test/fixtures/events.yml file and edit it so that it looks like Listing 9-3.
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Listing 9-3. Events Fixture, test/fixtures/events.yml
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tiki_party: id: 1 user_id: 1 title: "Tiki Party" url: "http://example.com" description: "A wonderfully good time" location: "Hampton's Apartment" occurs_on: <%= 1.week.from_now.to_s(:db)%>
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That s all you need to do. The data in these fixtures will be inserted automatically into your test database before your tests run. With fixtures in place, we re ready to start creating our test cases.
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Fixtures are parsed by ERb before they re loaded, so you can use ERb in them, just as you can Tip
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in your view templates. This is useful for creating dynamic dates, as in:
created_at: <%= 5.days.ago.to_s(:db) %>.
We ll take each test case one at a time, beginning with create.
Adding a Create Test
Open the test/unit/events_test.rb file and create the first test case by deleting the test_truth method and replacing it with a test called test_should_create_event. Your file should look like Listing 9-4.
Listing 9-4. The test/unit/events_test.rb File
require File.dirname(__FILE__) + '/../test_helper' class EventTest < Test::Unit::TestCase fixtures :events, :users def test_should_create_event
CHAPTER 9 TESTING YOUR APPLICATION
event = Event.new event.title = "Test Event" event.url = "http://example.com" event.description = "Test description" event.location = "Test location" event.occurs_on = "2007-09-09" assert event.save end end
The test_should_create_event case is standard event creation fare. We re creating a new event in the same way we would create one from the console. The only real difference is on the last line of the test case:
assert event.save
Before we go any further, let s take a deeper look at assertions as they pertain to Test::Unit.
Testing with Assertions
Assertions are a statement of expected outcome. As the README for Test::Unit states, assertions are like saying I assert that x should be equal to y. If the assertion turns out to be correct, the assertion passes. If the assertion turns out to be false, the assertion fails and Test::Unit reports a failure. Test::Unit ships with a bevy of built-in assertions, and Rails adds a bunch of its own. We ll get to the Rails-added assertions as we look at each test case, but first, here s the standard set of Test::Unit assertions for reference:
assert(boolean, message=nil) assert_block(message="assert_block failed.") do ... end assert_equal(expected, actual, message=nil) assert_in_delta(expected_float, actual_float, delta, message="") assert_instance_of(klass, object, message="") assert_kind_of(klass, object, message="") assert_match(pattern, string, message="") assert_nil(object, message="") assert_no_match(regexp, string, message="") assert_not_equal(expected, actual, message="") assert_not_nil(object, message="") assert_not_same(expected, actual, message="") assert_nothing_raised(*args) do ... end
CHAPTER 9 TESTING YOUR APPLICATION
assert_nothing_thrown(message="") do ... end assert_operator(object1, operator, object2, message="") assert_raise(expected_exception_klass, message="") do ... end assert_respond_to(object, method, message="") assert_same(expected, actual, message="") assert_send(send_array, message="") assert_throws(expected_symbol, message="") do ... end
The assert method is perhaps the most basic of the lot. It simply asserts that the return value of its first argument is true. And we know that event.save will return true if the event saves and return false otherwise. So, by asserting event.save, we successfully test that the event was saved. Pretty easy, isn t it
Geoffrey Grosenbach (a.k.a. topfunky) has a useful cheat sheet that summarizes all available Tip
assertions. Download it from http://nubyonrails.topfunky.com/articles/2006/08/24/ ruby-rails-test-rails-cheat-sheet.
Let s run the test. First, make sure your test database is prepared and that your fixtures are loaded.
$ rake db:test:prepare $ ruby test/unit/event_test.rb
Loaded suite test/unit/event_test Started . Finished in 0.168879 seconds. 1 tests, 1 assertions, 0 failures, 0 errors
Just as the output from the test says, we ran one test (test_should_create_event), which included one assertion (assert event.save), and everything passed. Life is good!
You don t need to run the db:test:prepare task when you re running the entire test suite via Rake. Tip
When run via Rake (rake test:units), the test environment is prepared for you.
CHAPTER 9 TESTING YOUR APPLICATION
Adding a Find Test
Next on our list is testing that we can successfully find an event. We ll use the data in the fixture we created to help us. Add the method shown in Listing 9-5 after test_should_ create_event.
Listing 9-5. Test Case for Finding an Event, in test/unit/event_test.rb
def test_should_find_event event_id = events(:tiki_party).id assert_nothing_raised { Event.find(event_id) } end
Note Fixtures can be accessed in your test cases by name. Use fixture(:name), where fixture is
the plural name of the model and :name is the symbolized name of the fixture you re after. This will return an Active Record object on which you can call methods. Here, we re getting at the tiki_party Event fixture using events(:tiki_party).
Here, we re testing that we can find an event of the given id. First, we grab the id attribute from the fixture, and then we test that we can use Event.find to retrieve it. We re using the assertion assert_nothing_raised because we know that find raises an exception if the record cannot be found. If no exception is raised, we know that finding works. Again, let s run the test and see what happens.
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