old_contents: """Test map files generation."""
  
  from modoboa.lib.test_utils import MapFilesTestCase as BaseTestCase
  
  
  class MapFilesTestCase(BaseTestCase):
  
      """Test case for modoboa_admin."""
  
      extension = "modoboa_admin"
  
      MAP_FILES = [
          "sql-domains.cf", "sql-domain-aliases.cf", "sql-aliases.cf",
          "sql-domain-aliases-mailboxes.cf", "sql-catchall-aliases.cf",
          "sql-maintain.cf"
      ]
  
new_contents: """Test map files generation."""
  
  from django.test import TestCase
  
  from modoboa.lib.test_utils import MapFilesTestCaseMixin
  
  
  class MapFilesTestCase(MapFilesTestCaseMixin, TestCase):
  
      """Test case for modoboa_admin."""
  
      extension = "modoboa_admin"
  
      MAP_FILES = [
          "sql-domains.cf", "sql-domain-aliases.cf", "sql-aliases.cf",
          "sql-domain-aliases-mailboxes.cf", "sql-catchall-aliases.cf",
          "sql-maintain.cf"
      ]
  
subject: Fix unit tests