diff --git a/apps/api/tests/test_check_trust_drift_commit_outside_context_poc.py b/apps/api/tests/test_check_trust_drift_commit_outside_context_poc.py
index 1e4aad8a..41e4efd3 100644
--- a/apps/api/tests/test_check_trust_drift_commit_outside_context_poc.py
+++ b/apps/api/tests/test_check_trust_drift_commit_outside_context_poc.py
@@ -192,7 +192,7 @@ class _ClosedAfterExitContext:
 
 
 @pytest.mark.asyncio
-async def test_log_appears_proves_commit_runs_inside_with(caplog):
+async def test_log_appears_proves_commit_runs_inside_with(caplog, capsys):
     """行為證據：當 __aexit__ 後 commit 會拋錯時，log 仍然出現
     → 證明 commit 是在 with 內就跑完了，不在 with 外（與 critic 主張相反）
     """
@@ -206,6 +206,7 @@ async def test_log_appears_proves_commit_runs_inside_with(caplog):
     mock_db = AsyncMock()
     mock_db.execute = AsyncMock(return_value=mock_result)
     mock_db.commit = AsyncMock()  # 初始 commit OK，__aexit__ 後會被替換成拋錯
+    commit_before_exit = mock_db.commit
 
     alerter = AsyncMock()
     alerter.alert_governance = AsyncMock()
@@ -231,8 +232,18 @@ async def test_log_appears_proves_commit_runs_inside_with(caplog):
     # 2. mutation 已發生
     assert stale.status == "deprecated"
 
-    # 3. KEY：log 出現了 — 證明 commit 在 __aexit__ 之前就跑完
-    log_text = " | ".join(rec.getMessage() for rec in caplog.records)
+    # 3. KEY：commit 在 __aexit__ 之前就跑完。
+    # full-suite 下 structlog 可能已被其他測試設定成 stdout renderer，
+    # 因此同時檢查 caplog 與 capsys，避免 capture backend 差異造成假紅燈。
+    assert commit_before_exit.await_count == 1
+    captured = capsys.readouterr()
+    log_text = " | ".join(
+        [
+            " | ".join(rec.getMessage() for rec in caplog.records),
+            captured.out,
+            captured.err,
+        ]
+    )
     assert "governance_trust_drift_auto_deprecated" in log_text, (
         f"如果 critic 主張為真（commit 在 with 外），log 不該出現。"
         f"但實際 log 出現了 → 證明 critic 主張為假。Log: {log_text!r}"