diff --git a/yunke-server/tests/test_analytics_api.py b/yunke-server/tests/test_analytics_api.py
index 2e35991..b76fab0 100644
--- a/yunke-server/tests/test_analytics_api.py
+++ b/yunke-server/tests/test_analytics_api.py
@@ -84,6 +84,11 @@ async def test_overview_endpoint(make_client, monkeypatch):
         "/api/analytics/overview", params={"channel": "wechat", "scope": "year"}
     )
     assert r2.status_code == 422
+    # channel 非法 → 422(同一 Literal 校验路径)
+    r3 = await client.get(
+        "/api/analytics/overview", params={"channel": "sms", "scope": "today"}
+    )
+    assert r3.status_code == 422
 
 
 async def test_overview_unmapped_accounts(make_client, monkeypatch):