1 files changed, 77 insertions, 0 deletions
diff --git a/actionmailer/test/i18n_with_controller_test.rb b/actionmailer/test/i18n_with_controller_test.rb
new file mode 100644
index 0000000000..6e75cff347
--- /dev/null
+++ b/actionmailer/test/i18n_with_controller_test.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "action_view"
+require "action_controller"
+
+class I18nTestMailer < ActionMailer::Base
+  configure do |c|
+    c.assets_dir = ""
+  end
+
+  def mail_with_i18n_subject(recipient)
+    @recipient  = recipient
+    I18n.locale = :de
+    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
+    email = I18nTestMailer.mail_with_i18n_subject("test@localhost").deliver_now
+    render plain: "Mail sent - Subject: #{email.subject}"
+  end
+end
+
+class ActionMailerI18nWithControllerTest < ActionDispatch::IntegrationTest
+  Routes = ActionDispatch::Routing::RouteSet.new
+  Routes.draw do
+    ActiveSupport::Deprecation.silence do
+      get ":controller(/:action(/:id))"
+    end
+  end
+
+  class RoutedRackApp
+    attr_reader :routes
+
+    def initialize(routes, &blk)
+      @routes = routes
+      @stack = ActionDispatch::MiddlewareStack.new(&blk).build(@routes)
+    end
+
+    def call(env)
+      @stack.call(env)
+    end
+  end
+
+  APP = RoutedRackApp.new(Routes)
+
+  def app
+    APP
+  end
+
+  teardown do
+    I18n.locale = I18n.default_locale
+  end
+
+  def test_send_mail
+    stub_any_instance(Mail::SMTP, instance: Mail::SMTP.new({})) do |instance|
+      assert_called(instance, :deliver!) do
+        with_translation "de", email_subject: "[Anmeldung] Willkommen" do
+          get "/test/send_mail"
+          assert_equal "Mail sent - Subject: [Anmeldung] Willkommen", @response.body
+        end
+      end
+    end
+  end
+
+  private
+
+    def with_translation(locale, data)
+      I18n.backend.store_translations(locale, data)
+      yield
+    ensure
+      I18n.backend.reload!
+    end
+end