Included rails-dom-testing in rails_info_controller_test.rb

railties/test/rails_info_controller_test.rb

 require 'abstract_unit'
+require 'rails-dom-testing'
 
 module ActionController
   class Base
@@ -9,6 +10,8 @@ class Base
 class InfoControllerTest < ActionController::TestCase
   tests Rails::InfoController
 
+  include Rails::Dom::Testing::Assertions::SelectorAssertions
+
   def setup
     Rails.application.routes.draw do
       get '/rails/info/properties' => "rails/info#properties"