This plugin allows you to create 'scenarios' which are collections of fixtures and ruby files that represent a context against which you can run tests.
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Copyright (c) 2007 Tom Preston-Werner =FixtureScenarios This plugin allows you to create "scenarios" which are collections of fixtures and ruby files that represent a context against which you can run tests. ==Disclaimer This software is in Beta. Send feedback to tom at rubyisawesome dot com or find me (mojombo) on irc.freenode.net. ==Installation FixtureScenarios should work on both 1.1.6 and edge rails. Currently you must install this plugin from the subversion repository script/plugin install http://fixture-scenarios.googlecode.com/svn/trunk/fixture_scenarios ==WARNING Because this plugin clears out fixture data between your test classes, you may see some of your tests fail after installation. If this occurs, look at your tests to see if you didn't actually load a required fixture for that test class. If you forgot to add it and your tests passed anyway (because of fixture contamination), just add the missing fixture(s) and you'll be good to go. ==The Basics To create a scenario, simply create a subdirectory under test/fixtures in your Rails app. The name of the subdirectory will be the name of the scenario. Inside this new directory, you can place fixture files, and/or Ruby files. [RAILS_ROOT] +-test/ +-fixtures/ +-brand_new_user/ +-users.yml # in users.yml borges: id: 1 name: Jorge Luis Borges active: 1 To load the scenario for testing, you simply use the +scenario+ method instead of the normal +fixtures+ method. require File.dirname(__FILE__) + '/../test_helper' class UserTest < Test::Unit::TestCase scenario :brand_new_user def test_should_be_active assert users(:borges).active? end end All of the fixtures placed into your scenario directory will be loaded when you invoke the +scenario+ method with your scenario name. In addition, any Ruby files you place in the scenario directory will be run after the fixtures. You can use a Ruby file to create non-database model instances, set up relationships between fixtures (instead of creating fixtures for the join tables), or replace fixtures entirely by creating your database items with Ruby code. In this example, +scenario+ will actually load all fixtures from the fixture directory *and* your scenario directory. This is useful if you have some fixtures (such as lookup data) that you'd like to have in most of your scenarios. To prevent the loading of fixtures in the fixtures root directory, use the <tt>:root</tt> option. This can be very useful if you still have tests using regular fixtures. scenario :brand_new_user, :root => false If you've just started FixtureScenarios on an existing project, adding :root => false to every scenario call will become tedious, so you can set the option globally in your test_helper.rb (inside the Test::Unit::TestCase class) like so: self.scenarios_load_root_fixtures = false To keep things DRY in your scenarios, you can extend or layer scenarios on top of each other. Following with our example, to create an "experienced user" scenario, we could create another subdirectory under the existing "brand_new_user" that would contain fixture/Ruby files that add upon the "brand new user" scenario. [RAILS_ROOT] +-test/ +-fixtures/ +-brand_new_user/ +-users.yml +-experienced_user/ +-articles.yml Now when you load the +experienced_user+ scenario, it will load any fixture/Ruby files in "fixtures", then in "brand_new_user", then in "experienced_user"! Building off of your existing scenarios keeps data redundancy to a minimum, and makes it easy to change data for multiple scenarios simultaneously. ==Testing your scenarios Scenarios represent your assumptions about a given context. If these assumptions are wrong, your tests will be inaccurate. Your scenarios should be unit tested along with the rest of your application. This plugin allows you to place scenario tests in a "scenario" directory under your "test" directory. [RAILS_ROOT] +-test/ +-scenario/ +-brand_new_user_test.rb +-experienced_user_test.rb You can run these tests with rake. rake test:scenarios # run just scenario tests rake # run unit, functional, integration, and scenario tests Scenario tests will protect you from accidentally changing your assumptions in a dangerous or transparent way when modifying existing scenarios.