diff --git a/tests/test_ad_ecpm_trace_revenue.py b/tests/test_ad_ecpm_trace_revenue.py
index 23f1d8e..cd800e0 100644
--- a/tests/test_ad_ecpm_trace_revenue.py
+++ b/tests/test_ad_ecpm_trace_revenue.py
@@ -35,12 +35,14 @@ def test_revenue_yuan_by_trace_sums_and_clamps() -> None:
             _ecpm("t1", "200", "sess-t1-a"),
             _ecpm("t1", "300", "sess-t1-b"),
             _ecpm("t2", "0", "sess-t2-a"),
+            _ecpm("t_cap", "60000", "sess-cap-a"),  # 600 元 CPM > ¥500 钳顶
         ])
         db.flush()
-        rev = crud_ecpm.revenue_yuan_by_trace(db, ["t1", "t2", "t3"])
+        rev = crud_ecpm.revenue_yuan_by_trace(db, ["t1", "t2", "t3", "t_cap"])
         assert rev["t1"] == 0.005
-        assert rev.get("t2", 0.0) == 0.0
+        assert rev["t2"] == 0.0  # 有展示但 eCPM=0 → 0 元(仍在结果里)
         assert "t3" not in rev  # 无展示的 trace 不出现在结果里
+        assert rev["t_cap"] == 0.5  # min(¥600, ¥500)/1000,证明钳顶生效(非 0.6)
     finally:
         db.rollback()
         db.close()