diff --git a/tests/module_api/test_event_unsigned_addition.py b/tests/module_api/test_event_unsigned_addition.py
new file mode 100644
index 0000000000..b64426b1ac
--- /dev/null
+++ b/tests/module_api/test_event_unsigned_addition.py
@@ -0,0 +1,59 @@
+# Copyright 2023 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from twisted.test.proto_helpers import MemoryReactor
+
+from synapse.events import EventBase
+from synapse.rest import admin, login, room
+from synapse.server import HomeServer
+from synapse.types import JsonDict
+from synapse.util import Clock
+
+from tests.unittest import HomeserverTestCase
+
+
+class EventUnsignedAdditionTestCase(HomeserverTestCase):
+ servlets = [
+ room.register_servlets,
+ admin.register_servlets,
+ login.register_servlets,
+ ]
+
+ def prepare(
+ self, reactor: MemoryReactor, clock: Clock, homeserver: HomeServer
+ ) -> None:
+ self._store = homeserver.get_datastores().main
+ self._module_api = homeserver.get_module_api()
+ self._account_data_mgr = self._module_api.account_data_manager
+
+ def test_annotate_event(self) -> None:
+ """Test that we can annotate an event when we request it from the
+ server.
+ """
+
+ async def add_unsigned_event(event: EventBase) -> JsonDict:
+ return {"test_key": event.event_id}
+
+ self._module_api.register_add_extra_fields_to_unsigned_client_event_callbacks(
+ add_field_to_unsigned_callback=add_unsigned_event
+ )
+
+ user_id = self.register_user("user", "password")
+ token = self.login("user", "password")
+
+ room_id = self.helper.create_room_as(user_id, tok=token)
+ result = self.helper.send(room_id, "Hello!", tok=token)
+ event_id = result["event_id"]
+
+ event_json = self.helper.get_event(room_id, event_id, tok=token)
+ self.assertEqual(event_json["unsigned"].get("test_key"), event_id)
diff --git a/tests/rest/client/test_retention.py b/tests/rest/client/test_retention.py
index d3e06bf6b3..534dc339f3 100644
--- a/tests/rest/client/test_retention.py
+++ b/tests/rest/client/test_retention.py
@@ -243,7 +243,7 @@ class RetentionTestCase(unittest.HomeserverTestCase):
assert event is not None
time_now = self.clock.time_msec()
- serialized = self.serializer.serialize_event(event, time_now)
+ serialized = self.get_success(self.serializer.serialize_event(event, time_now))
return serialized
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