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@@ -15,23 +15,61 @@ module ActionController
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     end
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   end
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-  # Superclass for Action Controller functional tests. Infers the controller under test from the test class name,
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-  # and creates @controller, @request, @response instance variables.
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+  # Superclass for ActionController functional tests. Functional tests allow you to
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+  # test a single controller action per test method. This should not be confused with
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+  # integration tests (see ActionController::IntegrationTest), which are more like
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+  # "stories" that can involve multiple controllers and mutliple actions (i.e. multiple
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+  # different HTTP requests).
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   #
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-  #   class WidgetsControllerTest < ActionController::TestCase
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-  #     def test_index
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-  #       get :index
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+  # == Basic example
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+  #
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+  # Functional tests are written as follows:
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+  # 1. First, one uses the +get+, +post+, +put+, +delete+ or +head+ method to simulate
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+  #    an HTTP request. 
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+  # 2. Then, one asserts whether the current state is as expected. "State" can be anything:
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+  #    the controller's HTTP response, the database contents, etc.
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+  #
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+  # For example:
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+  #
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+  #   class BooksControllerTest < ActionController::TestCase
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+  #     def test_create
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+  #       # Simulate a POST response with the given HTTP parameters.
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+  #       post(:create, :book => { :title => "Love Hina" })
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+  #       
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+  #       # Assert that the controller tried to redirect us to
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+  #       # the created book's URI.
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+  #       assert_response :found
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+  #       
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+  #       # Assert that the controller really put the book in the database.
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+  #       assert_not_nil Book.find_by_title("Love Hina")
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   #     end
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   #   end
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   #
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-  # * @controller - WidgetController.new
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-  # * @request    - ActionController::TestRequest.new
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-  # * @response   - ActionController::TestResponse.new
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+  # == Special instance variables
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+  #
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+  # ActionController::TestCase will also automatically provide the following instance
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+  # variables for use in the tests:
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+  #
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+  # <b>@controller</b>::
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+  #      The controller instance that will be tested.
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+  # <b>@request</b>::
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+  #      An ActionController::TestRequest, representing the current HTTP
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+  #      request. You can modify this object before sending the HTTP request. For example,
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+  #      you might want to set some session properties before sending a GET request.
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+  # <b>@response</b>::
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+  #      An ActionController::TestResponse object, representing the response
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+  #      of the last HTTP response. In the above example, <tt>@response</tt> becomes valid
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+  #      after calling +post+. If the various assert methods are not sufficient, then you
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+  #      may use this object to inspect the HTTP response in detail.
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+  #
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+  # (Earlier versions of Rails required each functional test to subclass
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+  # Test::Unit::TestCase and define @controller, @request, @response in +setup+.)
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   #
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-  # (Earlier versions of Rails required each functional test to subclass Test::Unit::TestCase and define 
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-  # @controller, @request, @response in +setup+.)
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+  # == Controller is automatically inferred
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   #
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-  # If the controller cannot be inferred from the test class name, you can explicity set it with +tests+.
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+  # ActionController::TestCase will automatically infer the controller under test
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+  # from the test class name. If the controller cannot be inferred from the test
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+  # class name, you can explicity set it with +tests+.
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   #
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   #   class SpecialEdgeCaseWidgetsControllerTest < ActionController::TestCase
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   #     tests WidgetController
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@@ -103,4 +141,4 @@ module ActionController
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       @request.remote_addr = '208.77.188.166' # example.com
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     end
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  end
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-end
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\ No newline at end of file
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+end

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@@ -361,6 +361,7 @@ module ActionController #:nodoc:
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   module TestProcess
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     def self.included(base)
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       # execute the request simulating a specific HTTP method and set/volley the response
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+      # TODO: this should be un-DRY'ed for the sake of API documentation.
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       %w( get post put delete head ).each do |method|
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         base.class_eval <<-EOV, __FILE__, __LINE__
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           def #{method}(action, parameters = nil, session = nil, flash = nil)