# File lib/action_controller/assertions.rb, line 103
      def assert_template(expected = nil, message=nil)
        rendered = expected ? @response.rendered_file(!expected.include?('/')) : @response.rendered_file
        msg = build_message(message, "expecting <?> but rendering with <?>", expected, rendered)
        assert_block(msg) do
          if expected.nil?
            !@response.rendered_with_file?
          else
            expected == rendered
          end
        end
      end