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tests/test_asgi.py failures with python 3.12 #1020
Description
I bump into some test failures with python 3.12, alpine linux edge:
======================================= test session starts ========================================
platform linux -- Python 3.12.2, pytest-8.1.1, pluggy-1.4.0
rootdir: /home/ncopa/aports/community/py3-prometheus-client/src/prometheus_client-0.20.0
collected 309 items
tests/openmetrics/test_exposition.py .................... [ 6%]
tests/openmetrics/test_parser.py ............................................. [ 21%]
tests/test_asgi.py FException ignored in: <function ApplicationCommunicator.__del__ at 0x7f0e7e09d120>
Traceback (most recent call last):
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 58, in __del__
self.stop(exceptions=False)
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 49, in stop
if not self.future.done():
^^^^^^^^^^^
AttributeError: 'ApplicationCommunicator' object has no attribute 'future'
FFFFException ignored in: <function ApplicationCommunicator.__del__ at 0x7f0e7e09d120>
Traceback (most recent call last):
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 58, in __del__
self.stop(exceptions=False)
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 49, in stop
if not self.future.done():
^^^^^^^^^^^
AttributeError: 'ApplicationCommunicator' object has no attribute 'future'
Exception ignored in: <function ApplicationCommunicator.__del__ at 0x7f0e7e09d120>
Traceback (most recent call last):
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 58, in __del__
self.stop(exceptions=False)
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 49, in stop
if not self.future.done():
^^^^^^^^^^^
AttributeError: 'ApplicationCommunicator' object has no attribute 'future'
Exception ignored in: <function ApplicationCommunicator.__del__ at 0x7f0e7e09d120>
Traceback (most recent call last):
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 58, in __del__
self.stop(exceptions=False)
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 49, in stop
if not self.future.done():
^^^^^^^^^^^
AttributeError: 'ApplicationCommunicator' object has no attribute 'future'
FFF [ 23%]
tests/test_core.py ......................................................................... [ 47%]
........................... [ 55%]
tests/test_exposition.py .......................................................... [ 74%]
tests/test_gc_collector.py .. [ 75%]
tests/test_graphite_bridge.py ....... [ 77%]
tests/test_multiprocess.py ............................. [ 87%]
tests/test_parser.py ........................ [ 94%]
tests/test_platform_collector.py .. [ 95%]
tests/test_process_collector.py .... [ 96%]
tests/test_samples.py .. [ 97%]
tests/test_twisted.py . [ 97%]
tests/test_wsgi.py ....... [100%]
============================================= 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)
tests/test_asgi.py:151:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e3290>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
___________________________________ ASGITest.test_gzip_disabled ____________________________________
self = <tests.test_asgi.ASGITest testMethod=test_gzip_disabled>
def test_gzip_disabled(self):
# Increment a metric.
metric_name = "counter"
help_text = "A counter"
increments = 2
self.increment_metrics(metric_name, help_text, increments)
# Disable compression explicitly.
app = make_asgi_app(self.registry, disable_compression=True)
> self.seed_app(app)
tests/test_asgi.py:167:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e3570>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
________________________________ ASGITest.test_openmetrics_encoding ________________________________
self = <tests.test_asgi.ASGITest testMethod=test_openmetrics_encoding>
def test_openmetrics_encoding(self):
"""Response content type is application/openmetrics-text when appropriate Accept header is in request"""
app = make_asgi_app(self.registry)
> self.seed_app(app)
tests/test_asgi.py:178:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e3290>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
_________________________________ ASGITest.test_plaintext_encoding _________________________________
self = <tests.test_asgi.ASGITest testMethod=test_plaintext_encoding>
def test_plaintext_encoding(self):
"""Response content type is text/plain when Accept header is missing in request"""
app = make_asgi_app(self.registry)
> self.seed_app(app)
tests/test_asgi.py:188:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e3850>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
__________________________________ ASGITest.test_report_metrics_1 __________________________________
self = <tests.test_asgi.ASGITest testMethod=test_report_metrics_1>
def test_report_metrics_1(self):
> self.validate_metrics("counter", "A counter", 2)
tests/test_asgi.py:133:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:126: in validate_metrics
self.seed_app(app)
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e39c0>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
__________________________________ ASGITest.test_report_metrics_2 __________________________________
self = <tests.test_asgi.ASGITest testMethod=test_report_metrics_2>
def test_report_metrics_2(self):
> self.validate_metrics("counter", "Another counter", 3)
tests/test_asgi.py:136:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:126: in validate_metrics
self.seed_app(app)
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e3b30>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
__________________________________ ASGITest.test_report_metrics_3 __________________________________
self = <tests.test_asgi.ASGITest testMethod=test_report_metrics_3>
def test_report_metrics_3(self):
> self.validate_metrics("requests", "Number of requests", 5)
tests/test_asgi.py:139:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:126: in validate_metrics
self.seed_app(app)
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e39c0>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
__________________________________ ASGITest.test_report_metrics_4 __________________________________
self = <tests.test_asgi.ASGITest testMethod=test_report_metrics_4>
def test_report_metrics_4(self):
> self.validate_metrics("failed_requests", "Number of failed requests", 7)
tests/test_asgi.py:142:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
tests/test_asgi.py:126: in validate_metrics
self.seed_app(app)
tests/test_asgi.py:53: in seed_app
self.communicator = ApplicationCommunicator(app, self.scope)
/usr/lib/python3.12/site-packages/asgiref/testing.py:24: in __init__
self.future = contextvars.Context().run(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
coro = <coroutine object make_asgi_app.<locals>.prometheus_app at 0x7f0e7d2e3850>
def create_task(coro, *, name=None, context=None):
"""Schedule the execution of a coroutine object in a spawn task.
Return a Task object.
"""
> loop = events.get_running_loop()
E RuntimeError: no running event loop
/usr/lib/python3.12/asyncio/tasks.py:417: RuntimeError
========================================= warnings summary =========================================
../../../../../../../usr/lib/python3.12/site-packages/twisted/web/http.py:103
/usr/lib/python3.12/site-packages/twisted/web/http.py:103: DeprecationWarning: 'cgi' is deprecated and slated for removal in Python 3.13
import cgi
tests/test_exposition.py::TestPushGateway::test_metrics_handler_subclassing
/home/ncopa/aports/community/py3-prometheus-client/src/prometheus_client-0.20.0/prometheus_client/metrics_core.py:27: RuntimeWarning: coroutine 'make_asgi_app.<locals>.prometheus_app' was never awaited
if not METRIC_NAME_RE.match(name):
Enable tracemalloc to get traceback where the object was allocated.
See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.
tests/test_exposition.py::TestPushGateway::test_metrics_handler_subclassing
tests/test_gc_collector.py::TestGCCollector::test_empty
/usr/lib/python3.12/site-packages/_pytest/unraisableexception.py:80: PytestUnraisableExceptionWarning: Exception ignored in: <function ApplicationCommunicator.__del__ at 0x7f0e7e09d120>
Traceback (most recent call last):
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 58, in __del__
self.stop(exceptions=False)
File "/usr/lib/python3.12/site-packages/asgiref/testing.py", line 49, in stop
if not self.future.done():
^^^^^^^^^^^
AttributeError: 'ApplicationCommunicator' object has no attribute 'future'
warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))
tests/test_gc_collector.py::TestGCCollector::test_empty
/home/ncopa/aports/community/py3-prometheus-client/src/prometheus_client-0.20.0/tests/test_gc_collector.py:14: RuntimeWarning: coroutine 'make_asgi_app.<locals>.prometheus_app' was never awaited
gc.collect()
Enable tracemalloc to get traceback where the object was allocated.
See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.
-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
===================================== short test summary info ======================================
FAILED tests/test_asgi.py::ASGITest::test_gzip - RuntimeError: no running event loop
FAILED tests/test_asgi.py::ASGITest::test_gzip_disabled - RuntimeError: no running event loop
FAILED tests/test_asgi.py::ASGITest::test_openmetrics_encoding - RuntimeError: no running event loop
FAILED tests/test_asgi.py::ASGITest::test_plaintext_encoding - RuntimeError: no running event loop
FAILED tests/test_asgi.py::ASGITest::test_report_metrics_1 - RuntimeError: no running event loop
FAILED tests/test_asgi.py::ASGITest::test_report_metrics_2 - RuntimeError: no running event loop
FAILED tests/test_asgi.py::ASGITest::test_report_metrics_3 - RuntimeError: no running event loop
FAILED tests/test_asgi.py::ASGITest::test_report_metrics_4 - RuntimeError: no running event loop
============================ 8 failed, 301 passed, 5 warnings in 4.16s =============================
Activity
ncopa commentedon Apr 1, 2024
seems like it comes from asgiref 3.8.1 upgrade.
andy-maier commentedon Apr 2, 2024
I also ran into this issue on the tox py3.8 environment when doing PR #1019 and circumvented it py pinning asgiref to 3.6.0 in tox.ini (same solution that was already used for pypy3.8 tox environment).
mgorny commentedon Jul 22, 2024
@ncopa, could you please update the bug summary to mention the cause (asgiref >= 3.8)? That would make it easier to find this.
mgorny commentedon Sep 12, 2025
Is this still a problem? I can't reproduce it with the newest version. And the pins for py3.9 in
tox.ininot only don't seem to make any sense for me, but actually break #1138.fix: Remove obsolete asgiref pin
fix: Use `asyncio.new_event_loop()` to create event loop for tests (#…
csmarchbanks commentedon Sep 26, 2025
I am going to close this as it has been awhile and the pinning is now gone.