diff --git a/tests/unit/test_generated_video_verification_code.py b/tests/unit/test_generated_video_verification_code.py
index 03487ff58..ee1febaee 100755
--- a/tests/unit/test_generated_video_verification_code.py
+++ b/tests/unit/test_generated_video_verification_code.py
@@ -258,7 +258,7 @@ class TestVerificationCodeProperties:
             ttl_seconds=1,
         )
         # 手动改过期时间到过去
-        from datetime import datetime, timezone, timedelta
+        from datetime import datetime, timedelta, timezone
 
         vc.expires_at = datetime.now(timezone.utc) - timedelta(seconds=1)
         assert vc.is_expired is True
@@ -276,7 +276,7 @@ class TestVerificationCodeProperties:
     def test_is_valid_expired(self):
         """过期的验证码无效."""
         vc = VerificationCode.create(recipient="u@test.com", code_type="email_bind", ttl_seconds=1)
-        from datetime import datetime, timezone, timedelta
+        from datetime import datetime, timedelta, timezone
 
         vc.expires_at = datetime.now(timezone.utc) - timedelta(seconds=1)
         assert vc.is_valid is False