setup_controller_request_and_response

# File actionpack/lib/action_controller/test_case.rb, line 556
      def setup_controller_request_and_response
        @controller = nil unless defined? @controller

        @response_klass = ActionDispatch::TestResponse

        if klass = self.class.controller_class
          if klass < ActionController::Live
            @response_klass = LiveTestResponse
          end
          unless @controller
            begin
              @controller = klass.new
            rescue
              warn "could not construct controller #{klass}" if $VERBOSE
            end
          end
        end

        @request          = TestRequest.create(@controller.class)
        @response         = build_response @response_klass
        @response.request = @request

        if @controller
          @controller.request = @request
          @controller.params = {}
        end
      end