ASGI tests are failing on Python 3.14 due to missing event loop #1137
Description
All of the tests in tests/test_asgi.py are failing with Python 3.14.0rc2:
$ uv pip install -e . pytest asgiref
Resolved 7 packages in 2ms
Built prometheus-client @ file:///tmp/client_python
Prepared 1 package in 648ms
Installed 7 packages in 9ms
+ asgiref==3.9.1
+ iniconfig==2.1.0
+ packaging==25.0
+ pluggy==1.6.0
+ prometheus-client==0.23.0 (from file:///tmp/client_python)
+ pygments==2.19.2
+ pytest==8.4.2
$ .venv/bin/pytest tests/test_asgi.py -x
========================================================= test session starts =========================================================
platform linux -- Python 3.14.0rc2, pytest-8.4.2, pluggy-1.6.0
rootdir: /tmp/client_python
configfile: pyproject.toml
collected 9 items
tests/test_asgi.py FE
=============================================================== ERRORS ================================================================
_______________________________________________ ERROR at teardown of ASGITest.test_gzip _______________________________________________
self = <tests.test_asgi.ASGITest testMethod=test_gzip>
def tearDown(self):
if self.communicator:
> asyncio.get_event_loop().run_until_complete(
^^^^^^^^^^^^^^^^^^^^^^^^
self.communicator.wait()
)
tests/test_asgi.py:48:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <asyncio.unix_events._UnixDefaultEventLoopPolicy object at 0x7f893e9078c0>
def get_event_loop(self):
"""Get the event loop for the current context.
Returns an instance of EventLoop or raises an exception.
"""
if self._local._loop is None:
> raise RuntimeError('There is no current event loop in thread %r.'
% threading.current_thread().name)
E RuntimeError: There is no current event loop in thread 'MainThread'.
/usr/lib/python3.14/asyncio/events.py:715: RuntimeError
============================================================== FAILURES ===============================================================
_________________________________________________________ ASGITest.test_gzip __________________________________________________________
self = <tests.test_asgi.ASGITest testMethod=test_gzip>
def test_gzip(self):
# Increment a metric.
metric_name = "counter"
help_text = "A counter"
increments = 2
self.increment_metrics(metric_name, help_text, increments)
app = make_asgi_app(self.registry)
self.seed_app(app)
# Send input with gzip header.
self.scope["headers"] = [(b"accept-encoding", b"gzip")]
> self.send_input({"type": "http.request", "body": b""})
tests/test_asgi.py:163:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:56: in send_input
asyncio.get_event_loop().run_until_complete(
^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <asyncio.unix_events._UnixDefaultEventLoopPolicy object at 0x7f893e9078c0>
def get_event_loop(self):
"""Get the event loop for the current context.
Returns an instance of EventLoop or raises an exception.
"""
if self._local._loop is None:
> raise RuntimeError('There is no current event loop in thread %r.'
% threading.current_thread().name)
E RuntimeError: There is no current event loop in thread 'MainThread'.
/usr/lib/python3.14/asyncio/events.py:715: RuntimeError
======================================================= short test summary info =======================================================
FAILED tests/test_asgi.py::ASGITest::test_gzip - RuntimeError: There is no current event loop in thread 'MainThread'.
ERROR tests/test_asgi.py::ASGITest::test_gzip - RuntimeError: There is no current event loop in thread 'MainThread'.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 2 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
===================================================== 1 failed, 1 error in 0.15s ======================================================Note that using asyncio.get_event_loop() to create a new event loop was deprecated, and in Python 3.14 it raises an exception instead. FWIU you need to create the event loop yourself (I gues in the setUp() method).
I can reproduce this with 0.23.0.
Reactions are currently unavailable