diff --git a/danding_bot/plugins/group_horse_racing/test_commands.py b/danding_bot/plugins/group_horse_racing/test_commands.py
index fd20c9d..1a79eb8 100644
--- a/danding_bot/plugins/group_horse_racing/test_commands.py
+++ b/danding_bot/plugins/group_horse_racing/test_commands.py
@@ -144,9 +144,9 @@ class _FakeBot:
 
     async def send_msg(self, **kwargs):
         self.messages.append(dict(kwargs))
-        message_id = str(self._next_message_id)
+        message_id = self._next_message_id
         self._next_message_id += 1
-        return message_id
+        return {"message_id": message_id}
 
 
 class _InMemoryRoomStore: