diff --git a/tests/unit/test_ai_client_video.py b/tests/unit/test_ai_client_video.py
index fc874cfb4..4ec73f2a0 100644
--- a/tests/unit/test_ai_client_video.py
+++ b/tests/unit/test_ai_client_video.py
@@ -1,11 +1,11 @@
 """#2106 DoubaoClient.video_generation 单测，覆盖 submit/poll/download 主路径和失败分支。"""
 
 from __future__ import annotations
-import httpx
 
 from pathlib import Path
 from unittest.mock import MagicMock, patch
 
+import httpx
 import pytest
 
 from packages.shared.ai_client import DoubaoClient