Required rails-dom-testing in test_case.rb

actionview/lib/action_view/test_case.rb

@@ -3,6 +3,8 @@
 require 'action_controller/test_case'
 require 'action_view'
 
+require 'rails-dom-testing'
+
 module ActionView
   # = Action View Test Case
   class TestCase < ActiveSupport::TestCase
@@ -34,7 +36,7 @@ module Behavior
       extend ActiveSupport::Concern
 
       include ActionDispatch::Assertions, ActionDispatch::TestProcess
-      include ActionView::Assertions
+      include Rails::Dom::Testing::Assertions
       include ActionController::TemplateAssertions
       include ActionView::Context