Remove deprecation warnings for Rails 5 and 6

test-app/config/application.rb

@@ -11,6 +11,7 @@ Bundler.require(*Rails.groups)
 
 module TestApp
   class Application < Rails::Application
+    config.load_defaults 5.2
     # Settings in config/environments/* take precedence over those specified here.
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.