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TESTING YOUR APPLICATION
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That s all you need to do. The data in the fixtures is inserted automatically into your test database before your tests run. With fixtures in place, you re ready to start creating test cases.
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TIP Fixtures are parsed by ERb before they re loaded, so you can use ERb in them just as you can in view templates. This is useful for creating dynamic dates, as you so in published_at: <%= 3.days.ago %>.
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The following sections present the test cases one at a time, beginning with create.
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Adding a Create Test
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Open the test/unit/article_test.rb file, and create the first test case by deleting the test "the truth" method and replacing it with a test called test "should create article". Your file should look like Listing 10-5. Listing 10-5. The Create Article Test in test/unit/article_test.rb: http://gist.github.com/358401 require 'test_helper' class ArticleTest < ActiveSupport::TestCase test "should create article" do article = Article.new article.user = users(:eugene) article.title = "Test article" article.body = "Test body" assert article.save end end The test "should create article" case is standard article-creation fare. You create a new article in the same way you d create one from the console. The only real difference is on the last line of the test case: assert article.save
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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 returns an Active Record object on which you can call methods. Here, you get at the eugene user fixture using users(:eugene).
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TESTING YOUR APPLICATION
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Before you go any further, let s take a deeper look at assertions as they pertain to Test::Unit and ActiveSupport::TestCase.
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Testing with Assertions
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Assertions are statements 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. You see the Rails-added assertions as you 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 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 asserts that the return value of its first argument is true. And you know that article.save returns true if the article saves and returns false otherwise. So, by asserting article.save, you successfully test that the article was saved. Pretty easy, isn t it
TIP Geoffrey Grosenbach (a.k.a. topfunky) has a useful cheat sheet that summarizes all available assertions. You can download it from http://nubyonrails.com/articles/ruby-rails-test-rails-cheat-sheet.
TESTING YOUR APPLICATION
Let s run the test. This time, run only the article test, invoking Ruby directly: $ ruby -Itest test/unit/article_test.rb Loaded suite test/unit/article_test Started . Finished in 0.168879 seconds.
1 tests, 1 assertions, 0 failures, 0 errors, 0 skips Just as the output from the test says, you ran one test (test "should create article"), which included one assertion (assert article.save), and everything passed. Life is good! Notice the -Itest parameter that you pass to the ruby command. You add that to make sure Ruby includes the test directory while running the article_test file; that is required because Rails provides a file called test/test_helper.rb to be included in all your tests. When you run tests using the rake command, rake takes care of adding test/test_helper.rb for you.
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