diff --git a/tests/rest/client/sliding_sync/test_rooms_meta.py b/tests/rest/client/sliding_sync/test_rooms_meta.py
index 8d6039715f..c619dd83fb 100644
--- a/tests/rest/client/sliding_sync/test_rooms_meta.py
+++ b/tests/rest/client/sliding_sync/test_rooms_meta.py
@@ -1198,3 +1198,55 @@ class SlidingSyncRoomsMetaTestCase(SlidingSyncBase):
joined_dm_room_id: True,
},
)
+
+ def test_old_room_with_unknown_room_version(self) -> None:
+ """Test that an old room with unknown room version does not break
+ sync."""
+ user1_id = self.register_user("user1", "pass")
+ user1_tok = self.login(user1_id, "pass")
+
+ # We first create a standard room, then we'll change the room version in
+ # the DB.
+ room_id = self.helper.create_room_as(
+ user1_id,
+ tok=user1_tok,
+ )
+
+ # Poke the database and update the room version to an unknown one.
+ self.get_success(
+ self.hs.get_datastores().main.db_pool.simple_update(
+ "rooms",
+ keyvalues={"room_id": room_id},
+ updatevalues={"room_version": "unknown-room-version"},
+ desc="updated-room-version",
+ )
+ )
+
+ # Invalidate method so that it returns the currently updated version
+ # instead of the cached version.
+ self.hs.get_datastores().main.get_room_version_id.invalidate((room_id,))
+
+ # For old unknown room versions we won't have an entry in this table
+ # (due to us skipping unknown room versions in the background update).
+ self.get_success(
+ self.store.db_pool.simple_delete(
+ table="sliding_sync_joined_rooms",
+ keyvalues={"room_id": room_id},
+ desc="delete_sliding_room",
+ )
+ )
+
+ # Also invalidate some caches to ensure we pull things from the DB.
+ self.store._events_stream_cache._entity_to_key.pop(room_id)
+ self.store._get_max_event_pos.invalidate((room_id,))
+
+ sync_body = {
+ "lists": {
+ "foo-list": {
+ "ranges": [[0, 1]],
+ "required_state": [],
+ "timeline_limit": 5,
+ }
+ }
+ }
+ response_body, _ = self.do_sync(sync_body, tok=user1_tok)
|
