Merge pull request #15083 from zuhao/refactor_actionmailer_i18n_with_controller_test

Use with_translation helper to clean up I18n stored translations.

actionmailer/test/i18n_with_controller_test.rb

@@ -10,15 +10,15 @@ class I18nTestMailer < ActionMailer::Base
   def mail_with_i18n_subject(recipient)
     @recipient  = recipient
     I18n.locale = :de
-    mail(to: recipient, subject: "#{I18n.t :email_subject} #{recipient}",
+    mail(to: recipient, subject: I18n.t(:email_subject),
       from: "system@loudthinking.com", date: Time.local(2004, 12, 12))
   end
 end
 
 class TestController < ActionController::Base
   def send_mail
-    I18nTestMailer.mail_with_i18n_subject("test@localhost").deliver
-    render text: 'Mail sent'
+    email = I18nTestMailer.mail_with_i18n_subject("test@localhost").deliver
+    render text: "Mail sent - Subject: #{email.subject}"
   end
 end
 
@@ -32,16 +32,19 @@ class ActionMailerI18nWithControllerTest < ActionDispatch::IntegrationTest
     Routes
   end
 
-  def setup
-    I18n.backend.store_translations('de', email_subject: '[Signed up] Welcome')
-  end
-
-  def teardown
-    I18n.locale = :en
-  end
-
   def test_send_mail
-    get '/test/send_mail'
-    assert_equal "Mail sent", @response.body
+    with_translation 'de', email_subject: '[Anmeldung] Willkommen' do
+      get '/test/send_mail'
+      assert_equal "Mail sent - Subject: [Anmeldung] Willkommen", @response.body
+    end
+  end
+
+  protected
+
+  def with_translation(locale, data)
+    I18n.backend.store_translations(locale, data)
+    yield
+  ensure
+    I18n.backend.reload!
   end
 end