old_contents: from django.conf import settings
  from django.core import mail
  from django.test import TestCase
  
  from djcelery_email.tasks import send_email
  import djcelery_email
  
  
  class TestBackend(mail.backends.base.BaseEmailBackend):
      def __init__(self, username=None, password=None, fail_silently=False, **kwargs):
          self.username = username
          self.password = password
  
      def send_messages(self, email_messages):
          return {'username': self.username, 'password': self.password}
  
  
  class DjangoCeleryEmailTests(TestCase):
  
      def test_sending_email(self):
          results = mail.send_mail('test', 'Testing with Celery! w00t!!', 'from@example.com',
                                   ['to@example.com'])
          for result in results:
              result.get()
          self.assertEqual(len(mail.outbox), 1)
          self.assertEqual(mail.outbox[0].subject, 'test')
  
      def test_sending_mass_email(self):
          emails = (
              ('mass 1', 'mass message 1', 'from@example.com', ['to@example.com']),
              ('mass 2', 'mass message 2', 'from@example.com', ['to@example.com']),
          )
          results = mail.send_mass_mail(emails)
          for result in results:
              result.get()
          self.assertEqual(len(mail.outbox), 2)
          self.assertEqual(len(results), 2)
          self.assertEqual(mail.outbox[0].subject, 'mass 1')
          self.assertEqual(mail.outbox[1].subject, 'mass 2')
  
      def test_setting_extra_configs(self):
          self.assertEqual(send_email.queue, 'django_email')
          self.assertEqual(send_email.delivery_mode, 1)
          self.assertEqual(send_email.rate_limit, '50/m')
  
      def test_backend_parameters(self):
          # Set test backend
          default_backend = djcelery_email.tasks.BACKEND
          djcelery_email.tasks.BACKEND = 'test_project.tester.tests.TestBackend'
          # Actual test
          results = mail.send_mail('test', 'Testing with Celery! w00t!!', 'from@example.com',
                                   ['to@example.com'], auth_user='username', auth_password='password')
          for result in results:
              self.assertEqual(result.get(), {'username': 'username', 'password': 'password'})
          # Restore backend
          djcelery_email.tasks.BACKEND = default_backend
  
new_contents: from django.conf import settings
  from django.core import mail
  from django.core.mail.backends.base import BaseEmailBackend
  from django.test import TestCase
  
  from djcelery_email.tasks import send_email
  import djcelery_email
  
  
  class TestBackend(BaseEmailBackend):
      def __init__(self, username=None, password=None, fail_silently=False, **kwargs):
          self.username = username
          self.password = password
  
      def send_messages(self, email_messages):
          return {'username': self.username, 'password': self.password}
  
  
  class DjangoCeleryEmailTests(TestCase):
  
      def test_sending_email(self):
          results = mail.send_mail('test', 'Testing with Celery! w00t!!', 'from@example.com',
                                   ['to@example.com'])
          for result in results:
              result.get()
          self.assertEqual(len(mail.outbox), 1)
          self.assertEqual(mail.outbox[0].subject, 'test')
  
      def test_sending_mass_email(self):
          emails = (
              ('mass 1', 'mass message 1', 'from@example.com', ['to@example.com']),
              ('mass 2', 'mass message 2', 'from@example.com', ['to@example.com']),
          )
          results = mail.send_mass_mail(emails)
          for result in results:
              result.get()
          self.assertEqual(len(mail.outbox), 2)
          self.assertEqual(len(results), 2)
          self.assertEqual(mail.outbox[0].subject, 'mass 1')
          self.assertEqual(mail.outbox[1].subject, 'mass 2')
  
      def test_setting_extra_configs(self):
          self.assertEqual(send_email.queue, 'django_email')
          self.assertEqual(send_email.delivery_mode, 1)
          self.assertEqual(send_email.rate_limit, '50/m')
  
      def test_backend_parameters(self):
          # Set test backend
          default_backend = djcelery_email.tasks.BACKEND
          djcelery_email.tasks.BACKEND = 'test_project.tester.tests.TestBackend'
          # Actual test
          results = mail.send_mail('test', 'Testing with Celery! w00t!!', 'from@example.com',
                                   ['to@example.com'], auth_user='username', auth_password='password')
          for result in results:
              self.assertEqual(result.get(), {'username': 'username', 'password': 'password'})
          # Restore backend
          djcelery_email.tasks.BACKEND = default_backend
  
subject: Fix import