diff --git a/resources/tester/test_349_0j_draft_vs_saved.py b/resources/tester/test_349_0j_draft_vs_saved.py
index 5eea91ca9..d25d7fd66 100644
--- a/resources/tester/test_349_0j_draft_vs_saved.py
+++ b/resources/tester/test_349_0j_draft_vs_saved.py
@@ -87,6 +87,7 @@ def _server(ts: dict, sampler) -> list[dict]:
                 "cut": design["cut_area_m2"],
                 "fill": design["fill_area_m2"],
                 "lineEnds": [line[0]["offset_m"], line[-1]["offset_m"]],
+                "unclosed": wide is not None,
             }
         )
     return out
@@ -172,9 +173,8 @@ def test_격자_없으면_넓힘_없음(r):
 
 
 def test_초안_상세_표본은_넓힌_표본(r):
-    widened = [
-        s for s in r["wide"]["stations"] if s["lineEnds"] and max(map(abs, s["lineEnds"])) > 20.01
-    ]
+    # 넓힘 표본 = 서버 `extend_unclosed` 가 표본을 낸 미교차 측점(지표면 끝에 막혀 못 넓혀도 · 508-1c)
+    widened = [s for s in r["server"] if s["unclosed"]]
     assert r["wide"]["shownWide"] == len(widened)  # 349-0n — 서버도 넓힌 표본을 상세에 남김
     assert r["plain"]["shownWide"] == 0