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CHAPTER 9 TESTING YOUR APPLICATION
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To begin, open up the test_helper file in your editor and add the login_as method as shown in Listing 9-11. You can find the test helper file in test/test_helper.rb; the method we re adding is highlighted in bold.
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Listing 9-11. The login_as Test Helper in test/test_helper.rb
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ENV["RAILS_ENV"] = "test" require File.expand_path(File.dirname(__FILE__) + "/../config/environment") require 'test_help' class Test::Unit::TestCase # Transactional fixtures accelerate your tests by wrapping each test method # in a transaction that's rolled back on completion. This ensures that the # test database remains unchanged so your fixtures don't have to be reloaded # between every test method. Fewer database queries means faster tests. # # Read Mike Clark's excellent walkthrough at # http://clarkware.com/cgi/blosxom/2005/10/24#Rails10FastTesting # # Every Active Record database supports transactions except MyISAM tables # in MySQL. Turn off transactional fixtures in this case; however, if you # don't care one way or the other, switching from MyISAM to InnoDB tables # is recommended. self.use_transactional_fixtures = true # Instantiated fixtures are slow, but give you @david where otherwise you # would need people(:david). If you don't want to migrate your existing # test cases which use the @david style and don't mind the speed hit (each # instantiated fixtures translates to a database query per test method), # then set this back to true. self.use_instantiated_fixtures = false # Add more helper methods to be used by all tests here... def login_as(user) @request.session[:user_id] = users(user).id end end
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CHAPTER 9 TESTING YOUR APPLICATION
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The login_as method is rather simple. All it does is manually set user_id in the @request.session object (just like our login action does) to the id of the given user, as obtained from the fixture. If we give it the name of one of our users fixtures, say, :eugene, it will set session[:user_id] to users(:eugene).id. Now that we ve created a way to simulate a logged-in user, we're ready to proceed with our tests, beginning with the index action.
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Testing the Index Action
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The test_index case is shown in Listing 9-12. Make sure yours looks like this before you proceed. Listing 9-12. Test Case for the Index Action
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def test_index get :index assert_response :success assert_template 'index' assert_not_nil assigns(:events) end
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Functional tests define methods that correspond to HTTP verbs (GET, POST, PUT, and DELETE), which you use to make requests. The first line of the test_index method makes a GET request for the index action using get :index. Here s the full syntax you use for these requests:
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http_method(action, parameters, session, flash)
In the case of test_index, we have no parameters to submit along with the request, so our call is quite simple. This will make a GET request to the index action in the same way as if we had done so with a browser. After the request has been made, we need to assert our expectations.
assert_response :success
The assert_response assertion is a custom assertion defined by Rails (that is, it s not part of the standard Test::Unit library), and it does exactly what its name implies: it asserts that there was a successful response to the request. Every time you make an HTTP request, the server responds with a status code. When the response is successful, the server returns a status code of 200. When an error occurs, it returns a 500. And when the browser can t find the resource being requested, it returns a 404. In our assertion, we re actually using the shortcut :success, which is the same as 200. We could have used assert_response(200), but it s easier to remember words like success or error than HTTP status codes, which is why we avoid using the latter whenever possible. Table 9-1 lists the shortcuts available when using assert_response.
CHAPTER 9 TESTING YOUR APPLICATION
Table 9-1. Status Code Shortcuts Known to assert_response Symbol
:success
Meaning
Status code was 200 Status code was in the 300 399 range Status code was 404 Status code was in the 500 599 range
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