  )
  from django.contrib.contenttypes import management
  from django.contrib.contenttypes.models import ContentType
  from django.core import checks
  from django.db import connections, models, router
  from django.test import TestCase
  from django.test.utils import captured_stdout, override_settings
  from django.utils.encoding import force_str
  
  from .models import Author, Article, SchemeIncludedURL
  
  
 
</s> remove from django.db import connections, DEFAULT_DB_ALIAS, router
from django.test import TestCase
 </s> add from django.db import connections, DEFAULT_DB_ALIAS
from django.test import TestCase, override_settings </s> remove from django.db import connection, connections, router, transaction
 </s> add from django.db import connection, connections, transaction </s> remove from django.test import override_settings
from django.db import connection, migrations, models, router
 </s> add from django.db import connection, migrations, models </s> remove from django.db import connection, router
 </s> add from django.db import connection
from django.db import connections, models
from django.test import TestCase, override_settings
from django.test.utils import captured_stdout
  )
  from django.contrib.contenttypes import management
  from django.contrib.contenttypes.models import ContentType
  from django.core import checks
from django.db import connections, models
from django.test import TestCase, override_settings
from django.test.utils import captured_stdout
from django.db import connections, models
from django.test import TestCase, override_settings
from django.test.utils import captured_stdout
from django.db import connections, models
from django.test import TestCase, override_settings
from django.test.utils import captured_stdout
  from django.utils.encoding import force_str
  
  from .models import Author, Article, SchemeIncludedURL
  
  
keep keep keep keep replace replace replace keep keep keep keep keep
 Replaced router.routers usage with override_settings(DATABASE_ROUTERS); refs #23933. 
tests/contenttypes_tests/tests.py