Move the test helper to be loaded on Railtie

Author: maurogeorge

lib/active_model/serializer/railtie.rb

@@ -19,5 +19,7 @@ class Railtie < Rails::Railtie
       app.load_generators
       require 'generators/serializer/resource_override'
     end
+
+    ActionController::TestCase.send(:include, ActiveModelSerializers::Test::Schema)
   end
 end

lib/active_model_serializers.rb

@@ -60,7 +60,6 @@ def silence_warnings
   ActionDispatch::Reloader.to_prepare do
     ActiveModel::Serializer.serializers_cache.clear
   end
-  ActionController::TestCase.send(:include, ActiveModelSerializers::Test::Schema)
 end
 
 require 'active_model/serializer/railtie'