diff --git a/tests/test_wechat_login.py b/tests/test_wechat_login.py
index 0a87d01..9c479b9 100644
--- a/tests/test_wechat_login.py
+++ b/tests/test_wechat_login.py
@@ -125,6 +125,7 @@ def test_wechat_bind_sms_phone_occupied(client, monkeypatch) -> None:
     assert body["status"] == "phone_occupied"
     assert body["token"] is None
     assert body["occupied_account"]["nickname"] == occupied_nickname
+    assert body["occupied_account"]["avatar_url"] is None  # 短信注册账号无头像 → 序列化为 null
     assert body["occupied_account"]["created_at"]