fix(test/schema): pin xdist_group to prevent multi-server startup, cap workers at 4

Makefile

@@ -12,7 +12,7 @@ FUZZ_FLAGS  := --override-ini="addopts=-v -x" -n logical -m fuzz \
 	--ignore=tests/api/test_schemathesis_swarm.py \
 	--ignore=tests/api/test_schemathesis_ttp.py
 SCHEMA_QUICK ?= 0
-SCHEMA_FLAGS := --override-ini="addopts=-v -x" -n logical -m fuzz --timeout=600 --timeout-method=thread
+SCHEMA_FLAGS := --override-ini="addopts=-v -x" -n 4 -m fuzz --timeout=600 --timeout-method=thread
 BENCH_FLAGS := --override-ini="addopts=-v" -p no:xdist --benchmark-only -m bench
 
 # ── Unit suites (xdist, 30s timeout) ─────────────────────────────────────────

tests/api/test_schemathesis.py

@@ -41,6 +41,7 @@ LIVE_PORT = _free_port()
 LIVE_SERVER_URL = f"http://127.0.0.1:{LIVE_PORT}"
 TEST_SECRET = "test-secret-for-automated-fuzzing"
 _QUICK = os.getenv("SCHEMA_QUICK") == "1"
+pytestmark = pytest.mark.xdist_group("schemathesis")
 
 import decnet.web.auth
 decnet.web.auth.SECRET_KEY = TEST_SECRET
@@ -145,7 +146,7 @@ schema = st.openapi.from_url(f"{LIVE_SERVER_URL}/openapi.json")
 @pytest.mark.fuzz
 @st.pytest.parametrize(api=schema)
 @settings(
-    max_examples=100 if _QUICK else 3000,
+    max_examples=10 if _QUICK else 100,
     deadline=None,
     verbosity=Verbosity.debug,
     suppress_health_check=[
@@ -162,7 +163,7 @@ def test_schema_compliance(case):
 @pytest.mark.fuzz
 @st.pytest.parametrize(api=schema)
 @settings(
-    max_examples=100 if _QUICK else 500,
+    max_examples=50 if _QUICK else 500,
     deadline=None,
     verbosity=Verbosity.normal,
     suppress_health_check=[

tests/api/test_schemathesis_ttp.py

@@ -28,6 +28,7 @@ import os
 import pytest
 
 _QUICK = os.getenv("SCHEMA_QUICK") == "1"
+pytestmark = pytest.mark.xdist_group("schemathesis")
 import schemathesis as st
 from hypothesis import HealthCheck, Verbosity, settings