process

# File actionpack/lib/action_controller/test_case.rb, line 376
      def process(action, parameters = nil, session = nil, flash = nil, http_method = 'GET')
        # Sanity check for required instance variables so we can give an
        # understandable error message.
        %w(@routes @controller @request @response).each do |iv_name|
          if !(instance_variable_names.include?(iv_name) || instance_variable_names.include?(iv_name.to_sym)) || instance_variable_get(iv_name).nil?
            raise "#{iv_name} is nil: make sure you set it in your test's setup method."
          end
        end

        @request.recycle!
        @response.recycle!
        @controller.response_body = nil
        @controller.formats = nil
        @controller.params = nil

        @html_document = nil
        @request.env['REQUEST_METHOD'] = http_method

        parameters ||= {}
        @request.assign_parameters(@routes, @controller.class.name.underscore.sub(/_controller$/, ''), action.to_s, parameters)

        @request.session = ActionController::TestSession.new(session) unless session.nil?
        @request.session["flash"] = @request.flash.update(flash || {})
        @request.session["flash"].sweep

        @controller.request = @request
        @controller.params.merge!(parameters)
        build_request_uri(action, parameters)
        Base.class_eval { include Testing }
        @controller.process_with_new_base_test(@request, @response)
        @request.session.delete('flash') if @request.session['flash'].blank?
        @response
      end