diff --git a/B09_Estimation/B09_Estimation_Calc_Base.ts b/B09_Estimation/B09_Estimation_Calc_Base.ts
index d2e77ad7d..011b21db0 100644
--- a/B09_Estimation/B09_Estimation_Calc_Base.ts
+++ b/B09_Estimation/B09_Estimation_Calc_Base.ts
@@ -44,7 +44,7 @@ export const SOURCES = [
 
 /** 자재 줄 사용자 표시 */
 export const SUPPLY = ["관급", "별도"] as const;
-const PARTS = ["labor", "material", "expense"] as const;
+const COVER_PARTS = ["labor", "material", "expense"] as const;
 
 function scaled(value: number, places: number, fn: (x: number) => number): number {
   const a = Math.abs(value);
@@ -121,8 +121,8 @@ export function machineCover(cover: unknown): Row {
   const out: Row = {};
   for (const [key, cell] of Object.entries(cover && typeof cover === "object" ? cover : {})) {
     const got: Row = {};
-    for (const p of PARTS) got[p] = cell && typeof cell === "object" ? num(cell[p]) : null;
-    if (PARTS.every((p) => got[p] !== null)) out[key] = got;
+    for (const p of COVER_PARTS) got[p] = cell && typeof cell === "object" ? num(cell[p]) : null;
+    if (COVER_PARTS.every((p) => got[p] !== null)) out[key] = got;
   }
   return out;
 }
@@ -310,7 +310,7 @@ export function computeBase(inputs: Row, user: Row): Row {
     if (!(b.key in covers)) continue; // 707-3 덮개 = 비목 합 · 합(줄은 그대로)
     b.book = { labor: b.labor, material: b.material, expense: b.expense, sum: b.sum };
     Object.assign(b, covers[b.key], { covered: true });
-    b.sum = total(PARTS.map((p) => b[p]));
+    b.sum = total(COVER_PARTS.map((p) => b[p]));
   }
   gaps = gaps.filter((g) => !(g.tab === "machine_blocks" && g.key in covers));
   const machine = blocks.map((b: Row, i: number) => ({
diff --git a/resources/tester/test_145_3_b09_bill.py b/resources/tester/test_145_3_b09_bill.py
index f18b74948..e853a191a 100644
--- a/resources/tester/test_145_3_b09_bill.py
+++ b/resources/tester/test_145_3_b09_bill.py
@@ -248,8 +248,8 @@ def test_거울_블록_나누기():
     )
     result = subprocess.run(
         ["node", "--experimental-strip-types", "--no-warnings",
-         "--input-type=module-typescript", "-e", calc + body],
-        capture_output=True, text=True, encoding="utf-8", timeout=60,
+         "--input-type=module-typescript"],  # 글은 stdin — 명령 줄 32 K 넘김(Windows)
+        input=calc + body, capture_output=True, text=True, encoding="utf-8", timeout=60,
     )  # fmt: skip
     assert result.returncode == 0, result.stderr
     assert json.loads(result.stdout) == compute_estimation(SPLIT_INPUTS, USER, DAEGA.get)