perf(ci): run tests in parallel via pytest-xdist

.coveragerc.ci

@@ -0,0 +1,16 @@
+# Coverage config for CI only — used via COVERAGE_RCFILE=.coveragerc.ci.
+#
+# Why a separate file: the local .coveragerc sets
+# `dynamic_context = test_function`, which coverage.py implements via
+# sys.settrace. pytest-cov refuses to run that under pytest-xdist
+# (DistCovError, pytest-cov#604) and it adds ~+13.6% runtime
+# (AGENT_DIARY 2026-09-15). CI only needs the coverage % gate, not
+# per-test contexts, so it uses this context-free config and runs in
+# parallel (-n auto). Local/bootstrap runs keep the context-rich
+# .coveragerc.
+[run]
+source = src
+branch = true
+
+[report]
+show_missing = true

.github/workflows/ci.yml

@@ -76,7 +76,15 @@ jobs:
           pip-audit -r requirements-lock.txt --no-deps --disable-pip
 
       - name: Full test suite (no filters)
-        run: python -m pytest tests/ -q --tb=short -m 'not slow and not benchmark' --cov=src --cov-report=term-missing --cov-fail-under=38
+        # -n auto (pytest-xdist): run tests on all runner cores. Measured
+        # locally 197s -> 71s (x2.76, 12 cores); CI runners have 4 cores.
+        # COVERAGE_RCFILE=.coveragerc.ci: the local .coveragerc sets
+        # dynamic_context=test_function, which pytest-cov rejects under xdist
+        # (DistCovError, pytest-cov#604) and which costs ~+13.6% (sys.settrace).
+        # CI only needs the coverage % gate, so it uses the context-free config.
+        env:
+          COVERAGE_RCFILE: .coveragerc.ci
+        run: python -m pytest tests/ -q --tb=short -m 'not slow and not benchmark' -n auto --cov=src --cov-report=term-missing --cov-fail-under=38
         timeout-minutes: 20
 
       # Grader mutation probe (evalmut-перенос, 2026-08-14): мутационный аудит

.gitignore

@@ -68,6 +68,7 @@ desktop.ini
 .coverage
 .coverage*
 .coveragerc
+!.coveragerc.ci
 htmlcov/
 .tox/
 

pyproject.toml

@@ -101,6 +101,7 @@ dependencies = [
 dev = [
     "pytest>=7.4.0",
     "pytest-asyncio>=0.21.0",
+    "pytest-xdist>=3.5.0",  # CI parallel run (-n auto): 197s -> 71s locally
     "pytest-cov>=7.1.0",  # CI coverage reporting (проверено: 7.1.0 + pytest 9.0.3)
     # Pinned: ruff 0.16+ ужесточил I001 (сортировка вложенных импорт-блоков) —
     # CI падал на lint 2026-08-05 (10 ошибок в 8 файлах). Бамп — только после

tests/test_temporal_facts_generator.py

@@ -7,6 +7,8 @@
 import importlib.util
 from pathlib import Path
 
+import pytest
+
 ROOT = Path(__file__).resolve().parent.parent
 
 _spec = importlib.util.spec_from_file_location(
@@ -15,8 +17,19 @@
 _spec.loader.exec_module(_mod)  # noqa: E402
 
 
-def test_generate_structure_and_kinds():
-    facts = _mod.generate(seed=7)
+@pytest.fixture(scope="module")
+def facts():
+    """generate(seed=7) — один раз на модуль (было 5 вызовов, стало 3).
+
+    generate() делает десятки git-подпроцессов (~7с на вызов). Три теста
+    используют один и тот же детерминированный набор. test_deterministic_
+    generation намеренно вызывает generate дважды (проверка детерминизма),
+    поэтому его не кэшируем.
+    """
+    return _mod.generate(seed=7)
+
+
+def test_generate_structure_and_kinds(facts):
     assert len(facts) >= 30
     kinds = {f["kind"] for f in facts}
     assert {"removed", "real", "absent"} <= kinds
@@ -27,9 +40,9 @@ def test_generate_structure_and_kinds():
         assert f["id"].startswith("T")
 
 
-def test_removed_ground_truth_validated_via_git():
+def test_removed_ground_truth_validated_via_git(facts):
     """removed-факт: символ реально был на C~1 (родителе коммита удаления), false@HEAD."""
-    removed = [f for f in _mod.generate(seed=7) if f["kind"] == "removed"]
+    removed = [f for f in facts if f["kind"] == "removed"]
     assert removed
     r = removed[0]
     path = r["support_patterns"][0][5:]
@@ -42,8 +55,8 @@ def test_removed_ground_truth_validated_via_git():
     assert r["was_true"] is True and r["truth"] is False
 
 
-def test_absent_names_are_grep_zero():
-    for f in _mod.generate(seed=7):
+def test_absent_names_are_grep_zero(facts):
+    for f in facts:
         if f["kind"] == "absent":
             assert _mod._grep_zero(f["value"]), f"{f['value']} встречается в src/"