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You also want to assert that the proper template was rendered in response to the request, for which you use another of Rails custom assertions: assert_template. Here, you expect to see the index template (from app/views/articles/index.html.erb) to be rendered, so test this expectation: assert_template 'index' You need to do one more thing: assert that the correct instance variables were assigned. If you look at the articles controller, you see that you set an instance variable called @articles that contains the articles collection. Rails gives you the ability to test whether this assignment was successful by way of the assigns method: assert_not_nil assigns(:articles) This asserts that @articles was, in fact, assigned (by virtue of the fact that it shouldn t be nil). You can use this technique to test for the existence of any instance variable set within your controllers. Useful, isn t it Using assigns gives you access to the instance variable, so you can do with it asyou please.

require 'strscan'

Note It s important to recognize that the filename doesn t match the name of the library, or class in this

case. Although most library developers tend to keep names consistent, not all do!

Listing 10-13. Updated Test Case for the show Action in test/functional/articles_controller_test.rb: http://gist.github.com/358410 require 'test_helper' class ArticlesControllerTest < ActionController::TestCase setup do @article = articles(:welcome_to_rails) end test "should get index" do get :index assert_response :success assert_template 'index' assert_not_nil assigns(:articles) end test "should get new" do get :new assert_response :success end test "should create article" do assert_difference('Article.count') do post :create, :article => @article.attributes end assert_redirected_to article_path(assigns(:article)) end test "should show article" do get :show, :id => @article.to_param assert_response :success assert_template 'show' assert_not_nil assigns(:article) assert assigns(:article).valid end test "should get edit" do get :edit, :id => @article.to_param assert_response :success end test "should update article" do put :update, :id => @article.to_param, :article => @article.attributes assert_redirected_to article_path(assigns(:article)) end

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Figure 3-14. One remaining error after carriage return, and new-line are added to ignorable whitespace In Figure 3-14, Norm has added the carriage return (the UTF8 encoding for this is written as "\r") and new line (written as "\n") to the interleave rule. After this, the only remaining error is the unexpected Lunchmeat token, which is really caused by the unexpected second order statement. To fix this problem, Norm encloses the Main syntax phrase on the right side of the equals sign (=) in parentheses and adds a postfix + to indicate that one or more instances of the conforming statement are expected (Figure 3-15). [Similar operators, called Kleene operators, are an asterisk (*) to indicate zero or more occurrences, and question mark ( ) to indicate zero or one occurrence.]

The best way to see StringScanner s feature set is to see it in action:

require 'strscan' string = StringScanner.new "This is a test" puts string.scan(/\w+/) puts string.scan(/\s+/) puts string.scan(/\w+/) puts string.scan(/\s+/) puts string.rest

In this example you step through the string by first matching a word with scan, then whitespace, then another word, then more whitespace, before asking StringScanner to give you the rest of the string with the rest method. However, scan will only return content if the specified pattern matches at the current position in the string. For example, this doesn t retrieve each word:

test "should destroy article" do assert_difference('Article.count', -1) do delete :destroy, :id => @article.to_param end assert_redirected_to articles_path end end The test "should show article" case is almost the same as test "should get index", but with one notable difference: you need to identify the record you want to show. If you were requesting this in a browser, the URL would look like /articles/1. Therefore, you need to pass in the :id parameter with a value of 1. If you look closely at the test request, you can see how this is done: get :show, :id => @article.to_param @article.to_param by default gets the id attribute of the :welcome_to_rails article you re getting from the fixtures that is assigned to the @article variable. You should always use the to_param method instead of id because it s the method Rails uses to generate URLs internally. You can pass arbitrary parameters in this fashion. You see more of this when you test the create and update actions, both of which require a set of article parameters. One more thing to notice here: you can treat the result of assigns(:article) as you would any Article object and call methods on it: assert assigns(:article).valid So, not only can you assert that there is an instance variable named @article, but you can also assert that it contains a valid Article object.

puts puts puts puts string.scan(/\w+/) string.scan(/\w+/) string.scan(/\w+/) string.scan(/\w+/)

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