Try

backend/conftest.py

@@ -34,8 +34,6 @@
 from users.tests.factories import UserFactory
 from api.cms.tests.factories import *  # noqa
 
-from django.test.utils import override_settings
-
 
 @pytest.fixture()
 def user(db):
@@ -131,14 +129,3 @@ def wrapper(conference):
         )
 
     return wrapper
-
-
-@pytest.fixture(scope="session", autouse=True)
-def test_settings():
-    with override_settings(**TEST_SETTINGS):
-        yield
-
-
-TEST_SETTINGS = {
-    "ALLOWED_HOSTS ": ["*"],
-}

backend/grants/tests/test_admin.py

@@ -15,9 +15,21 @@
 from django.http import HttpRequest
 from wagtail.models import Site, Page
 
+from django.test.utils import override_settings
+
 pytestmark = pytest.mark.django_db
 
 
+@pytest.fixture(scope="session", autouse=True)
+def test_settings():
+    with override_settings(
+        **{
+            "ALLOWED_HOSTS ": ["*"],
+        }
+    ):
+        yield
+
+
 def _setup_visa_page_and_request(request: HttpRequest, site: Site):
     """
     Configures request for testing and ensures 'visa' page existence.