diff --git a/tests/handlers/test_sync.py b/tests/handlers/test_sync.py
index 1960d2f0e1..9dd0e98971 100644
--- a/tests/handlers/test_sync.py
+++ b/tests/handlers/test_sync.py
@@ -1262,3 +1262,35 @@ class SyncStateAfterTestCase(tests.unittest.HomeserverTestCase):
)
)
self.assertEqual(state[("m.test_event", "")], second_state["event_id"])
+
+ def test_incremental_sync_lazy_loaded_no_timeline(self) -> None:
+ """Test that lazy-loading with an empty timeline doesn't return the full
+ state.
+
+ There was a bug where an empty state filter would cause the DB to return
+ the full state, rather than an empty set.
+ """
+ user = self.register_user("user", "password")
+ tok = self.login("user", "password")
+
+ # Create a room as the user and set some custom state.
+ joined_room = self.helper.create_room_as(user, tok=tok)
+
+ since_token = self.hs.get_event_sources().get_current_token()
+ end_stream_token = self.hs.get_event_sources().get_current_token()
+
+ state = self.get_success(
+ self.sync_handler._compute_state_delta_for_incremental_sync(
+ room_id=joined_room,
+ sync_config=generate_sync_config(user, use_state_after=True),
+ batch=TimelineBatch(
+ prev_batch=end_stream_token, events=[], limited=True
+ ),
+ since_token=since_token,
+ end_token=end_stream_token,
+ members_to_fetch=set(),
+ timeline_state={},
+ )
+ )
+
+ self.assertEqual(state, {})
|
