old_contents: import os
  from unittest import mock
  
  from django.conf import settings
  
  from zerver.lib.test_classes import ZulipTestCase
  from zproject.email_backends import get_forward_address
  
  
  class EmailLogTest(ZulipTestCase):
      def test_generate_and_clear_email_log(self) -> None:
          with self.settings(EMAIL_BACKEND="zproject.email_backends.EmailLogBackEnd"), mock.patch(
              "zproject.email_backends.EmailLogBackEnd._do_send_messages", lambda *args: 1
          ), self.assertLogs(level="INFO") as m, self.settings(DEVELOPMENT_LOG_EMAILS=True):
              result = self.client_get("/emails/generate/")
              self.assertEqual(result.status_code, 302)
              self.assertIn("emails", result["Location"])
  
              result = self.client_get("/emails/")
              self.assert_in_success_response(["All the emails sent in the Zulip"], result)
  
              result = self.client_get("/emails/clear/")
              self.assertEqual(result.status_code, 302)
              result = self.client_get(result["Location"])
              self.assertIn("manually generate most of the emails by clicking", str(result.content))
              output_log = (
                  "INFO:root:Emails sent in development are available at http://testserver/emails"
              )
              self.assertEqual(m.output, [output_log for i in range(15)])
  
      def test_forward_address_details(self) -> None:
          forward_address = "forward-to@example.com"
          result = self.client_post("/emails/", {"forward_address": forward_address})
          self.assert_json_success(result)
  
          self.assertEqual(get_forward_address(), forward_address)
  
          with self.settings(EMAIL_BACKEND="zproject.email_backends.EmailLogBackEnd"), mock.patch(
              "zproject.email_backends.EmailLogBackEnd._do_send_messages", lambda *args: 1
          ):
              result = self.client_get("/emails/generate/")
              self.assertEqual(result.status_code, 302)
              self.assertIn("emails", result["Location"])
              result = self.client_get(result["Location"])
              self.assert_in_success_response([forward_address], result)
          os.remove(settings.FORWARD_ADDRESS_CONFIG_FILE)
  
new_contents: import os
  from unittest import mock
  
  from django.conf import settings
  
  from zerver.lib.test_classes import ZulipTestCase
  from zproject.email_backends import get_forward_address
  
  
  class EmailLogTest(ZulipTestCase):
      def test_generate_and_clear_email_log(self) -> None:
          with self.settings(EMAIL_BACKEND="zproject.email_backends.EmailLogBackEnd"), mock.patch(
              "zproject.email_backends.EmailLogBackEnd._do_send_messages", lambda *args: 1
          ), self.assertLogs(level="INFO") as m, self.settings(DEVELOPMENT_LOG_EMAILS=True):
              result = self.client_get("/emails/generate/")
              self.assertEqual(result.status_code, 302)
              self.assertIn("emails", result["Location"])
  
              result = self.client_get("/emails/")
              self.assert_in_success_response(["All the emails sent in the Zulip"], result)
  
              result = self.client_get("/emails/clear/")
              self.assertEqual(result.status_code, 302)
              result = self.client_get(result["Location"])
              self.assertIn("manually generate most of the emails by clicking", str(result.content))
              output_log = (
                  "INFO:root:Emails sent in development are available at http://testserver/emails"
              )
              self.assertEqual(m.output, [output_log for i in range(15)])
  
      def test_forward_address_details(self) -> None:
          try:
              forward_address = "forward-to@example.com"
              result = self.client_post("/emails/", {"forward_address": forward_address})
              self.assert_json_success(result)
  
              self.assertEqual(get_forward_address(), forward_address)
  
              with self.settings(EMAIL_BACKEND="zproject.email_backends.EmailLogBackEnd"), mock.patch(
                  "zproject.email_backends.EmailLogBackEnd._do_send_messages", lambda *args: 1
              ):
                  result = self.client_get("/emails/generate/")
                  self.assertEqual(result.status_code, 302)
                  self.assertIn("emails", result["Location"])
                  result = self.client_get(result["Location"])
                  self.assert_in_success_response([forward_address], result)
          # Remove this file, even if the test fails, so that it does
          # not impact the state of the development environment.
          finally:
              os.remove(settings.FORWARD_ADDRESS_CONFIG_FILE)
  
subject: Remove `FORWARD_ADDRESS_CONFIG_FILE` created in test.