instance method xml_http_request

# File actionpack/lib/action_controller/test_case.rb, line 424
      def xml_http_request(*args)
        ActiveSupport::Deprecation.warn(<<-MSG.strip_heredoc)
          `xhr` and `xml_http_request` are deprecated and will be removed in Rails 5.1.
          Switch to e.g. `post :create, params: { comment: { body: 'Honey bunny' } }, xhr: true`.
        MSG

        @request.env['HTTP_X_REQUESTED_WITH'] = 'XMLHttpRequest'
        @request.env['HTTP_ACCEPT'] ||= [Mime[:js], Mime[:html], Mime[:xml], 'text/xml', '*/*'].join(', ')
        __send__(*args).tap do
          @request.env.delete 'HTTP_X_REQUESTED_WITH'
          @request.env.delete 'HTTP_ACCEPT'
        end
      end