"OSError: could not get source code" Came Up When "pytest_fixture_setup()" Executed about pytest-asyncio

[Klavionik]

The same error here, pytest 7.4.4 and pytest-asyncio 0.23.4. It was harassing me for hours yesterday and then suddenly gone (just as suddenly, as it started).

[halvomez]

pytest-asyncio 0.23.6 and pytest 8.2.0 same

gone with pytest==8.1.1

[seifertm]

Thanks for reporting this. The pytest-asyncio tests don't seem to be affected, so it's hard to find the cause of the error.

@muazhari @Klavionik @halvomez: Can any one provide a minimal code example that reproduces the issue?

[muazhari]

Fixed in pytest==8.2.1. However, I can't reproduce the error with minimal codes with pytest==8.2.0 and the same environment. I don't know why.

============================= test session starts ==============================
platform linux -- Python 3.10.12, pytest-8.2.1, pluggy-1.5.0
rootdir: /app
plugins: cov-5.0.0, asyncio-0.23.6, xdist-3.6.1, anyio-4.3.0
asyncio: mode=strict
1 worker [6 items] 
......       

[seifertm]

Since this issue seems to be fixed with more recent versions of pytest and I cannot reproduce it, I'll close the ticket until further evidence arrives.

[mike-oakley]

Also encountered this on the latest pytest (8.3.2). Causes the first test in the session to fail, but then all the subsequent ones succeed. Reverting to 0.21.2 resolves this 🤔

platform linux -- Python 3.9.6, pytest-8.3.2, pluggy-1.5.0

plugins: asyncio-0.23.8

asyncio: mode=auto

[seifertm]

@mike-oakley Any chance you can cook up a reproducer so we can get to the bottom of this?

[c137santos]

The same problem:

`$ poetry show pytest
 name         : pytest                                      
 version      : 8.3.2                                       
 description  : pytest: simple powerful testing with Python `

and

`$ poetry show pytest-asyncio
 name         : pytest-asyncio             
 version      : 0.23.8                     
 description  : Pytest support for asyncio `

[seifertm]

There's really not much I can do to help, unless someone can provide a minimal reproducer.

[devTarik]

There's really not much I can do to help, unless someone can provide a minimal reproducer.

Here is example fixture "event_loop" which we have a problem with

@pytest.fixture(scope='session')
def event_loop():
    try:
        loop = asyncio.get_running_loop()
    except RuntimeError:
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
    yield loop
    loop.close()

Try to run any tests, you might get error always in first test, because problem in moment initialization.

pytest==8.1.1 work good, 8.2.1 sometimes work, 8.2.2 doesn't work

You can try this and reproduce:
conftest.py

import asyncio
from httpx import AsyncClient

@pytest.fixture(scope='session')
def event_loop():
    try:
        loop = asyncio.get_running_loop()
    except RuntimeError:
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
    yield loop
    loop.close()

@pytest.fixture(scope='session')
async def http_client():
    async with AsyncClient(app=app, base_url='https://test.io/') as client:
        yield client

test_ping.py

from httpx import AsyncClient

async def test__ping(http_client: AsyncClient):
    response = await http_client.get('/ping')
    assert response.status_code == 200
    assert response.json() == {'msg': 'pong'}

Even this tiny test return this error