instance method non_kwarg_request_warning

# File actionpack/lib/action_controller/test_case.rb, line 662
      def non_kwarg_request_warning
        ActiveSupport::Deprecation.warn(<<-MSG.strip_heredoc)
          Using positional arguments in functional tests has been deprecated,
          in favor of keyword arguments, and will be removed in Rails 5.1.

          Deprecated style:
          get :show, { id: 1 }, nil, { notice: "This is a flash message" }

          New keyword style:
          get :show, params: { id: 1 }, flash: { notice: "This is a flash message" },
            session: nil # Can safely be omitted.
        MSG
      end