test: [#65222] upgrade pytest-asyncio

The `event_loop_policy` fixture is no longer required on Python 3.11+.
See pytest-dev/pytest-asyncio#1008.

Author: caspervk

backend/tests/conftest.py

@@ -1,23 +1,16 @@
 # SPDX-FileCopyrightText: Magenta ApS <https://magenta.dk>
 # SPDX-License-Identifier: MPL-2.0
 import asyncio
-import contextvars
 import os
 import secrets
-import traceback
-from asyncio import AbstractEventLoopPolicy
-from asyncio import DefaultEventLoopPolicy
-from asyncio import Task
 from collections.abc import AsyncGenerator
 from collections.abc import AsyncIterator
 from collections.abc import Awaitable
 from collections.abc import Callable
 from collections.abc import Generator
 from contextlib import asynccontextmanager
 from dataclasses import dataclass
-from functools import partial
 from operator import itemgetter
-from pathlib import Path
 from typing import Any
 from typing import AsyncContextManager
 from typing import Protocol
@@ -494,51 +487,6 @@ async def fixture_db(
         yield session
 
 
-@pytest.fixture(scope="session", autouse=True)
-def event_loop_policy() -> AbstractEventLoopPolicy:
-    """Custom implementation of pytest-asyncio's event_loop_policy fixture[1].
-
-    This fixture is used by pytest-asyncio to run test's setup/run/teardown. It
-    is needed to share contextvars between these stages; without it,
-    contextvars from async coroutine fixtures are not passed correctly to the
-    individual tests. See the issue[2] with solution implementation[3].
-
-    The fixture name shadows the default fixture from pytest-asyncio, and thus
-    overrides it. Note that the links below reference overwriting the event_loop
-    fixture instead of the event_loop_policy -- this has been deprecated.
-
-    [1] https://github.com/pytest-dev/pytest-asyncio/blob/e92efad68146469228b3ac3478b254b692c6bc90/pytest_asyncio/plugin.py#L957-L970
-    [2] https://github.com/pytest-dev/pytest-asyncio/issues/127
-    [3] https://github.com/Donate4Fun/donate4fun/blob/cdf047365b7d2df83a952f5bb9544c29051fbdbd/tests/fixtures.py#L87-L113
-    """
-
-    def task_factory(loop, coro, context=None):
-        # The task_factory breaks context isolation for asyncio tasks, so we need to
-        # check the calling context.
-        stack = traceback.extract_stack()
-        for frame in stack[-2::-1]:
-            package_name = Path(frame.filename).parts[-2]
-            if package_name != "asyncio":
-                if package_name == "pytest_asyncio":
-                    # This function was called from pytest_asyncio, use shared context
-                    break
-                else:
-                    # This function was called from somewhere else, create context copy
-                    context = None
-                break
-        return Task(coro, loop=loop, context=context)
-
-    context = contextvars.copy_context()
-
-    class CustomEventLoopPolicy(DefaultEventLoopPolicy):
-        def new_event_loop(self):
-            loop = super().new_event_loop()
-            loop.set_task_factory(partial(task_factory, context=context))
-            return loop
-
-    return CustomEventLoopPolicy()
-
-
 @dataclass
 class GQLResponse:
     data: dict | None