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-rw-r--r--tests/replication/test_sharded_event_persister.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/tests/replication/test_sharded_event_persister.py b/tests/replication/test_sharded_event_persister.py
index 0a6e4795ee..596ba5a0c9 100644
--- a/tests/replication/test_sharded_event_persister.py
+++ b/tests/replication/test_sharded_event_persister.py
@@ -17,6 +17,7 @@ from unittest.mock import patch
 from synapse.api.room_versions import RoomVersion
 from synapse.rest import admin
 from synapse.rest.client import login, room, sync
+from synapse.storage.util.id_generators import MultiWriterIdGenerator
 
 from tests.replication._base import BaseMultiWorkerStreamTestCase
 from tests.server import make_request
@@ -193,7 +194,10 @@ class EventPersisterShardTestCase(BaseMultiWorkerStreamTestCase):
         #
         # Worker2's event stream position will not advance until we call
         # __aexit__ again.
-        actx = worker_hs2.get_datastore()._stream_id_gen.get_next()
+        worker_store2 = worker_hs2.get_datastore()
+        assert isinstance(worker_store2._stream_id_gen, MultiWriterIdGenerator)
+
+        actx = worker_store2._stream_id_gen.get_next()
         self.get_success(actx.__aenter__())
 
         response = self.helper.send(room_id1, body="Hi!", tok=self.other_access_token)