diff --git a/zerver/tests/test_message_move_topic.py b/zerver/tests/test_message_move_topic.py
index 85cb456..30687d2 100644
--- a/zerver/tests/test_message_move_topic.py
+++ b/zerver/tests/test_message_move_topic.py
@@ -464,13 +464,13 @@ class MessageMoveTopicTest(ZulipTestCase):
         for call_args in mock_send_event_on_commit.call_args_list:
             (_arg_realm, arg_event, arg_notified_users) = call_args[0]
             [notified_user_id] = arg_notified_users
-            if arg_event["type"] == "user_topic":
-                self.assertEqual(arg_event["stream_id"], stream.id)
+            if arg_event.type == "user_topic":
+                self.assertEqual(arg_event.stream_id, stream.id)
                 user_topic_events[notified_user_id].append(
-                    (arg_event["topic_name"], arg_event["visibility_policy"])
+                    (arg_event.topic_name, arg_event.visibility_policy)
                 )
-            elif arg_event["type"] == "muted_topics":
-                muted_topics_events[notified_user_id].append(arg_event["muted_topics"])
+            elif arg_event.type == "muted_topics":
+                muted_topics_events[notified_user_id].append(arg_event.muted_topics)
         self.assertEqual(
             user_topic_events[hamlet.id],
             [
@@ -597,9 +597,9 @@ class MessageMoveTopicTest(ZulipTestCase):
         users_notified_via_user_topic_event: list[int] = []
         for call_args in mock_send_event_on_commit.call_args_list:
             (_arg_realm, arg_event, arg_notified_users) = call_args[0]
-            if arg_event["type"] == "user_topic":
+            if arg_event.type == "user_topic":
                 users_notified_via_user_topic_event.append(*arg_notified_users)
-            elif arg_event["type"] == "muted_topics":
+            elif arg_event.type == "muted_topics":
                 users_notified_via_muted_topics_event.append(*arg_notified_users)
         self.assertEqual(
             sorted(users_notified_via_muted_topics_event),
@@ -859,9 +859,9 @@ class MessageMoveTopicTest(ZulipTestCase):
         users_notified_via_user_topic_event: list[int] = []
         for call_args in mock_send_event_on_commit.call_args_list:
             (_arg_realm, arg_event, arg_notified_users) = call_args[0]
-            if arg_event["type"] == "user_topic":
+            if arg_event.type == "user_topic":
                 users_notified_via_user_topic_event.append(*arg_notified_users)
-            elif arg_event["type"] == "muted_topics":
+            elif arg_event.type == "muted_topics":
                 users_notified_via_muted_topics_event.append(*arg_notified_users)
         self.assertEqual(
             sorted(users_notified_via_muted_topics_event),