pytest-asyncio doesn't work with trio fixtures

[flolf]

My pytest.ini file contains the following:

asyncio_mode = strict

I have the following fixture

@pytest_trio.trio_fixture
async def a_fixture():
    async with trio_asyncio.open_loop():
        ...

And the following test:

@pytest.mark.trio
async def test_something(a_fixture):
    ...

Unfortunately the pytest collection fails at the fixture level:

/mnt/harmonix_vol2/soporifix_vol3/user/home/atl/ops3venv8_1/lib/python3.8/site-packages/pluggy/hooks.py:286: in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
/mnt/harmonix_vol2/soporifix_vol3/user/home/atl/ops3venv8_1/lib/python3.8/site-packages/pluggy/manager.py:93: in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
/mnt/harmonix_vol2/soporifix_vol3/user/home/atl/ops3venv8_1/lib/python3.8/site-packages/pluggy/manager.py:84: in <lambda>
    self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
/mnt/harmonix_vol2/soporifix_vol3/user/home/atl/ops3venv8_1/lib/python3.8/site-packages/pytest_asyncio/plugin.py:327: in pytest_pycollect_makeitem
    _preprocess_async_fixtures(collector.config, _HOLDER)
/mnt/harmonix_vol2/soporifix_vol3/user/home/atl/ops3venv8_1/lib/python3.8/site-packages/pytest_asyncio/plugin.py:244: in _preprocess_async_fixtures
    assert _has_explicit_asyncio_mark(fixturedef.func)
E   AssertionError: assert False
E    +  where False = _has_explicit_asyncio_mark(<function server_client at 0x7f0ef019ff70>)

Why is pytest-asyncio not recognising the trio fixture?

[asvetlov]

pytest-asyncio bug

[seifertm]

I came up with a possible fix (see this branch), but the corresponding test is still failing on Python 3.7.

I got in touch with pytest-trio to figure out the issue (see python-trio/pytest-trio#126)

[seifertm]

@flolf Can you please test again, if the latest state of master fixes your problem?
pip install --upgrade git+https://github.com/pytest-dev/pytest-asyncio.git

[aqc-carlodri]

Just stumbled into this issue and yes @seifertm I can confirm that pytest-asyncio-0.18.3.dev3+gf979af9 fixes the problem! Thank you! Is there a timeline for an official release including this fix?

[seifertm]

@aqc-carlodri Thanks for the feedback!
If it fixes the issue, we can do a release right now.

[aqc-carlodri]

sounds great thank you!

[seifertm]

@aqc-carlodri pytest-asyncio-0.18.3 is now available on PyPI