Fix type hint errors from Twisted trunk (#16526)

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/handlers/test_appservice.py b/tests/handlers/test_appservice.py

index 867dbd6001..c888d1ff01 100644
--- a/tests/handlers/test_appservice.py
+++ b/tests/handlers/test_appservice.py
@@ -156,6 +156,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         result = self.successResultOf(
             defer.ensureDeferred(self.handler.query_room_alias_exists(room_alias))
         )
+        assert result is not None
 
         self.mock_as_api.query_alias.assert_called_once_with(
             interested_service, room_alias_str