Remove railtie

test/serialization_test.rb

@@ -39,8 +39,6 @@ class RenderJsonTest < ActionController::TestCase
   end
 
   class TestController < ActionController::Base
-    include ActionController::Serialization
-
     protect_from_forgery
 
     serialization_scope :current_user

test/test_helper.rb

@@ -7,6 +7,8 @@ require "active_model_serializers"
 require "active_support/json"
 require "test/unit"
 
+require 'rails'
+
 module TestHelper
   Routes = ActionDispatch::Routing::RouteSet.new
   Routes.draw do