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Use SelectorEventLoop on Windows to fix pytest crashes

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Windows ProactorEventLoop has known memory corruption issues that cause
pytest-xdist worker crashes with "node down: Not properly terminated".

Setting WindowsSelectorEventLoopPolicy in conftest.py avoids this issue.

See: https://github.com/python/cpython/issues/116773

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Chris Guidry 2025-12-05 12:03:05 -05:00
commit bcd2e594f0
1 changed files with 7 additions and 0 deletions
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7
tests/conftest.py
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@ -1,4 +1,6 @@
import asyncio
import socket import socket
import sys
from collections.abc import Callable from collections.abc import Callable
from pathlib import Path from pathlib import Path
from typing import Any from typing import Any
@ -7,6 +9,11 @@ import pytest
from fastmcp.utilities.tests import temporary_settings from fastmcp.utilities.tests import temporary_settings
# Use SelectorEventLoop on Windows to avoid ProactorEventLoop crashes
# See: https://github.com/python/cpython/issues/116773
if sys.platform == "win32":
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
def pytest_collection_modifyitems(items): def pytest_collection_modifyitems(items):
"""Automatically mark tests in integration_tests folder with 'integration' marker.""" """Automatically mark tests in integration_tests folder with 'integration' marker."""