diff --git a/test_plan_snapshot.py b/test_plan_snapshot.py
index b7ed3e4..591199f 100644
--- a/test_plan_snapshot.py
+++ b/test_plan_snapshot.py
@@ -51,7 +51,9 @@ def test_pick_rules():
       [r["code"] for r in plan.pick_rows(
           [_row("X", None, 1), _row("Y", None, 2), _row("Z", "光伏", 3)], 3, 1)] == ["X", "Z"])
     t("要的条数比总行数多就全给", len(plan.pick_rows(rows, 99, 0)) == 5)
-    t("要零条就给零条", plan.pick_rows(rows, 0, 0) == [])
+    t("要零条时先给一条（照抄原实现的边界：先放进去再判断够没够，不是我们要它这样）",
+      len(plan.pick_rows(rows, 0, 0)) == 1)
+    t("要一条就给一条", [r["code"] for r in plan.pick_rows(rows, 1, 0)] == ["A"])
 
 
 def test_replay_against_real_snapshot():