Testing Rails Code

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Code Examples

Here’s an example of using asserts. Suppose you have a test that searches for a non-existent podcast episode; you’d want to assert that the result was nil. The test case code would read:

def test_podcast_does_not_exist
  podcast = Podcast.find_by_title(‘Intro’)
  assert_nil podcast
end

Another example checking to see if the test database contains three podcasts loaded from fixtures might read:

def test_three_podcasts_exist
  assert_equal, Podcast.find(:all), 3
end

Here’s an example of a fixture, illustrating how fixtures can use model associations. An entry in the podcast.yml file might read:

episodeone:
  name: Introductory Podcast
  listeners: anne, bob, charlie

and entries in the listeners.yml file would read:

anne:
  name: Anne
  podcast: episodeone

bob:
  name: Bob 
  podcast: episodeone

charlie:
  name: Charlie
  podcast: episodeone

Links to More Resources

See the following sections of the site for links to resources on testing:

• Testing in general
• Test-driven development
• Unit testing
• Functional testing
• Integration testing
• Test fixtures
• Testing Toolsl
• Behavior-Driven Development

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