Make silence a warning inserted by commit #4b3f8ac

actionmailer/test/i18n_with_controller_test.rb

@@ -1,6 +1,7 @@
 require 'abstract_unit'
 require 'action_view'
 require 'action_controller'
+require 'active_support/deprecation'
 
 class I18nTestMailer < ActionMailer::Base
   configure do |c|
@@ -54,7 +55,9 @@ class ActionMailerI18nWithControllerTest < ActionDispatch::IntegrationTest
   def test_send_mail
     Mail::SMTP.any_instance.expects(:deliver!)
     with_translation 'de', email_subject: '[Anmeldung] Willkommen' do
-      get '/test/send_mail'
+      ActiveSupport::Deprecation.silence do
+        get '/test/send_mail'
+      end
       assert_equal "Mail sent - Subject: [Anmeldung] Willkommen", @response.body
     end
   end