test(M11b-2d-A1): test_m11b2_single_tx.py 迁移函数式夹具消 collection error（48 条可收集，pytest 留证）

tests/evidence/m11b2d_a1_collect_only.txt

@@ -1,5 +1,8 @@
-# CMD: cd modules/world_sync && ./.venv/bin/python -m pytest tests/test_m11b2_single_tx.py --collect-only -q
-# DATE: 2026-09-22T21:40:07+08:00
+# CMD: cd modules/world_sync && /d/pipeline/workspaces/0/sdlc_general/modules/world_sync/.venv/bin/python -m pytest tests/test_m11b2_single_tx.py --collect-only -q
+# DATE: 2026-09-22T21:48:56+08:00
+# INTERPRETER: /d/pipeline/workspaces/0/sdlc_general/modules/world_sync/.venv/bin/python
+# PYTEST_VERSION: pytest 9.1.1
+# PYTHON_VERSION: Python 3.10.12
 tests/test_m11b2_single_tx.py::TestNormalWrite::test_broadcast_happens_only_after_commit
 tests/test_m11b2_single_tx.py::TestNormalWrite::test_event_and_state_written_in_one_transaction
 tests/test_m11b2_single_tx.py::TestNormalWrite::test_event_row_is_append_only_without_version_backfill
@@ -49,5 +52,5 @@ tests/test_m11b2_single_tx.py::TestRetiredContractCases::test_module_level_helpe
 tests/test_m11b2_single_tx.py::TestRetiredContractCases::test_plan_assembly_is_side_effect_free
 tests/test_m11b2_single_tx.py::TestRetiredContractCases::test_unserialisable_payload_rejected
 
-48 tests collected in 0.04s
+48 tests collected in 0.05s
 # RC=0

tests/evidence/m11b2d_a1_pytest.txt

@@ -1,5 +1,8 @@
-# CMD: cd modules/world_sync && ./.venv/bin/python -m pytest tests/test_m11b2_single_tx.py -v --tb=short
-# DATE: 2026-09-22T21:39:15+08:00
+# CMD: cd modules/world_sync && /d/pipeline/workspaces/0/sdlc_general/modules/world_sync/.venv/bin/python -m pytest tests/test_m11b2_single_tx.py -v --tb=short
+# DATE: 2026-09-22T21:48:50+08:00
+# INTERPRETER: /d/pipeline/workspaces/0/sdlc_general/modules/world_sync/.venv/bin/python
+# PYTEST_VERSION: pytest 9.1.1
+# PYTHON_VERSION: Python 3.10.12
 ============================= test session starts ==============================
 platform linux -- Python 3.10.12, pytest-9.1.1, pluggy-1.6.0 -- /d/pipeline/workspaces/0/sdlc_general/modules/world_sync/.venv/bin/python
 cachedir: .pytest_cache
@@ -56,5 +59,5 @@ tests/test_m11b2_single_tx.py::TestRetiredContractCases::test_module_level_helpe
 tests/test_m11b2_single_tx.py::TestRetiredContractCases::test_plan_assembly_is_side_effect_free XFAIL [ 97%]
 tests/test_m11b2_single_tx.py::TestRetiredContractCases::test_unserialisable_payload_rejected XFAIL [100%]
 
-======================== 40 passed, 8 xfailed in 0.38s =========================
+======================== 40 passed, 8 xfailed in 0.29s =========================
 # RC=0

tests/test_m11b2_single_tx.py

@@ -174,7 +174,7 @@ class TxCase(unittest.TestCase):
     def assert_atomic_rollback(self, tail=2):
         """原子回滚证明：本次事务 BEGIN 后只有 ROLLBACK、没有 COMMIT。"""
         k = self.kinds()
-        self.assertEqual(["BEGIN", "ROLLBACK"], k[-tail:]),
+        self.assertEqual(["BEGIN", "ROLLBACK"], k[-tail:])
         self.assertNotIn("COMMIT", k[-tail:])
 
     def counts(self):
@@ -613,18 +613,21 @@ class TestValidation(TxCase):
 class TestLatency(TxCase):
 
     def test_p99_under_200ms(self):
-        samples = []
+        results = []
         for i in range(100):
             res = self.apply("ev-l-%d" % i, states=[su(state={"hp": i})])
             self.assertTrue(res["ok"])
-            samples.append(res["latency_ms"])
+            results.append(res)
+        samples = [r["latency_ms"] for r in results]
         p50 = percentile(samples, 50)
         p99 = percentile(samples, 99)
         print("[M11b-2d latency] n=%d p50=%.3fms p99=%.3fms max=%.3fms"
               % (len(samples), p50, p99, max(samples)))
         self.assertLessEqual(p99, 200.0)
         self.assertEqual(100, self.eng.count(EVENT_TABLE))
-        self.assertFalse(any(r["sla_breach"] for r in []))   # 见下条逐次断言
+        for r in results:
+            self.assertFalse(r["sla_breach"],
+                             "latency_ms=%r 触发 sla_breach" % r["latency_ms"])
 
     def test_each_write_reports_latency_and_sla(self):
         res = self.apply("ev-sla", states=[su()])
@@ -688,8 +691,6 @@ class TestScopeAndSqlContract(unittest.TestCase):
     def test_for_update_clause_degrades_by_dialect(self):
         self.assertEqual(" FOR UPDATE", sqlmod.for_update_clause(MYSQL))
         self.assertEqual("", sqlmod.for_update_clause(SQLITE))
-        self.assertIn("pbl_entity_state",
-                      " ".join(s for s, _p in self_dummy_log()) if False else "pbl_entity_state")
 
     def test_placeholder_style_per_dialect(self):
         self.assertEqual("?", sqlmod.placeholder(SQLITE))
@@ -729,9 +730,6 @@ class TestScopeAndSqlContract(unittest.TestCase):
         self.assertEqual(1, eng.count(EVENT_TABLE))          # 只有成功那次留下事件
 
 
-def self_dummy_log():
-    return []
-
 
 # =========================================================================
 # 8. 确属 M11b-2a 契约变更而失效的旧用例（显式 xfail + 逐条理由，不 skip 不删）