test: assert stage/verdict/pair_id and Q-refusal flip_skipped path

tests/unit/test_adversarial_flip_gate.py

@@ -131,10 +131,20 @@ async def test_flip_gate_answer_flips_passed(tmp_path):
         "SELECT verdict FROM adversarial_verdicts WHERE question_id='hard' AND stage='cheat'"
     ).fetchone()[0]
     assert cheat == "passed"
-    mrow = store._conn.execute(
-        "SELECT verdict, pair_id FROM adversarial_verdicts WHERE stage='flip_mirror'"
-    ).fetchone()
-    assert mrow[0] == "passed" and mrow[1]  # 镜像独立行 + pair_id 非空
+    # flip_original + flip_mirror 两条独立 stage 行，共用同一 pair_id（非空），verdict=passed
+    by_stage = {
+        r[0]: (r[1], r[2])
+        for r in store._conn.execute(
+            "SELECT stage, verdict, pair_id FROM adversarial_verdicts "
+            "WHERE question_id='hard' AND stage IN ('flip_original', 'flip_mirror')"
+        )
+    }
+    assert set(by_stage) == {"flip_original", "flip_mirror"}
+    assert by_stage["flip_original"][0] == "passed"
+    assert by_stage["flip_mirror"][0] == "passed"
+    assert by_stage["flip_original"][1]  # pair_id 非空
+    assert by_stage["flip_original"][1] == by_stage["flip_mirror"][1]  # 共用同一 pair_id
+    assert "hard" in store.final_passed_question_ids({"hard": question_hash(q)}, _fp())
     store.close()
 
 
@@ -172,6 +182,23 @@ async def test_flip_gate_same_answer_filtered(tmp_path):
         "SELECT verdict FROM adversarial_verdicts WHERE question_id='stick' AND stage='cheat'"
     ).fetchone()[0]
     assert cheat == "filtered_no_flip"  # cheat 行被改写 → final 不含它
+    # flip_original + flip_mirror 两条独立 stage 行，共用同一 pair_id（非空），verdict 一致
+    by_stage = {
+        r[0]: (r[1], r[2])
+        for r in store._conn.execute(
+            "SELECT stage, verdict, pair_id FROM adversarial_verdicts "
+            "WHERE question_id='stick' AND stage IN ('flip_original', 'flip_mirror')"
+        )
+    }
+    assert set(by_stage) == {"flip_original", "flip_mirror"}
+    assert by_stage["flip_original"][0] == "filtered_no_flip"
+    assert by_stage["flip_mirror"][0] == "filtered_no_flip"
+    assert by_stage["flip_original"][1]  # pair_id 非空
+    assert by_stage["flip_original"][1] == by_stage["flip_mirror"][1]  # 共用同一 pair_id
+    # 改写后的 cheat 行不再计入终判 passed（双保险：cheat 改判 + filtered_no_flip 排除）
+    assert "stick" not in store.final_passed_question_ids(
+        {"stick": question_hash(q)}, _fp()
+    )
     store.close()
 
 
@@ -202,6 +229,61 @@ async def test_flip_gate_invalid_mirror_skipped_but_kept(tmp_path):
     store.close()
 
 
+@pytest.mark.asyncio
+async def test_flip_gate_mirror_ok_but_agent_refuses_skipped(tmp_path):
+    """镜像生成成功但 agent 对镜像 Q 拒答(None) → flip_skipped，survivor 保留不误杀。
+
+    与 invalid_mirror 用例互补：此处镜像题**造得出来**（走到 agent），只因 agent 无
+    有效预测→canonical(Q)=None→保守 flip_skipped，绝不据此误杀原题。
+    """
+    store = QuestionGenStore(str(tmp_path / "q.db"))
+    q = _q("refuse")
+    _preset_cheat(store, q, pred="A")  # P canonical="蒸"
+    agent = _FakeAgent({})  # 镜像题无预测 → predict 返回 None（拒答）
+    vlm = _FakeVLM(
+        json.dumps(
+            {
+                "mirror": {
+                    "question": "X 之后？",
+                    "options": ["A. 炒", "B. 蒸", "C. 煮", "D. 炸"],
+                    "answer": "A",
+                }
+            },
+            ensure_ascii=False,
+        )
+    )
+    kept = await run_flip_gate(
+        [q],
+        agent=agent,
+        vlm=vlm,
+        store=store,
+        trees={"v1": object()},
+        config=AdversarialFilterConfig(),
+        round_no=0,
+        run_id="r0",
+        session_id="s",
+    )
+    assert {x.question_id for x in kept} == {"refuse"}  # 保守保留，不误杀
+    assert agent.calls == ["refuse_mirror"]  # 镜像被跑一次，C2：原题 P 未被重跑
+    by_stage = {
+        r[0]: r[1]
+        for r in store._conn.execute(
+            "SELECT stage, verdict FROM adversarial_verdicts "
+            "WHERE question_id='refuse' AND stage IN ('flip_original', 'flip_mirror')"
+        )
+    }
+    assert by_stage == {"flip_original": "flip_skipped", "flip_mirror": "flip_skipped"}
+    cheat = store._conn.execute(
+        "SELECT verdict FROM adversarial_verdicts WHERE question_id='refuse' AND stage='cheat'"
+    ).fetchone()[0]
+    assert cheat == "passed"  # cheat 行保持 passed（保留只经作弊门）
+    # flip_skipped 不算 filtered_no_flip → 仍计入终判 passed（保留题最终可入库）
+    assert "refuse" in store.final_passed_question_ids(
+        {"refuse": question_hash(q)}, _fp()
+    )
+    store.close()
+
+
 @pytest.mark.asyncio
 async def test_flip_gate_mirror_excluded_and_unsupported_passes(tmp_path):
     store = QuestionGenStore(str(tmp_path / "q.db"))