Add controller attr_reader to controller specs

Closes #39

Author: dchelimsky

cucumber.yml

@@ -0,0 +1 @@
+default: --require features

features/controller_specs/readers.feature

@@ -0,0 +1,18 @@
+Feature: controller spec readers
+
+  Controller specs expose a number of different
+  attribute readers.
+
+  Scenario: access controller
+    Given a file named "spec/controllers/widgets_controller_spec.rb" with:
+      """
+      require "spec_helper.rb"
+
+      describe WidgetsController do
+        it "is available before an action" do
+          controller.should be_an_instance_of(WidgetsController)
+        end
+      end
+      """
+    When I run "rspec ./spec"
+    Then I should see "1 example, 0 failures"

lib/rspec/rails/example/controller_example_group.rb

@@ -4,17 +4,22 @@
 module ControllerExampleGroupBehaviour
   extend ActiveSupport::Concern
 
-  module ControllerClassReader
+  module ClassAttributeReaders
     def controller_class
       describes
     end
   end
 
+  module AttributeReaders
+    attr_reader :controller
+  end
+
   included do
     extend  Rspec::Rails::SetupAndTeardownAdapter
     include Rspec::Rails::TestUnitAssertionAdapter
     include ActionController::TestCase::Behavior
-    extend  ControllerClassReader
+    extend  ClassAttributeReaders
+    include AttributeReaders
     include Webrat::Matchers
     include Webrat::Methods
     include Rspec::Matchers