`test_aiohttp_request_ctx_manager_not_found` fails intermittently

[sarahec]

Describe the bug

While rebuilding python313Packages.aiohttp @ 3.12.10 on nixpkgs, tests/test_client_functional.py::test_aiohttp_request_ctx_manager_not_found[pyloop] was failing intermittently (~25%) on aarch64-Darwin with AssertionError: never executed

To Reproduce

Using nix on a M-series Mac:
nix-build -A python313Packages.aiohttp --check and observe it fails about a quarter of the time.

Expected behavior

The test should be reliable.

Logs/tracebacks

n/a

Python Version

$ python --version

3.13.4

aiohttp Version

$ python -m pip show aiohttp

3.12.10

multidict Version

$ python -m pip show multidict
6.4.4

propcache Version

$ python -m pip show propcache
0.3.1

yarl Version

$ python -m pip show yarl
1.20.0

OS

Nix on MacOS (aarch64-darwin)

Related component

Client

Additional context

No response

Code of Conduct

• I agree to follow the aio-libs Code of Conduct

[Dreamsorcerer]

Traceback would be useful..

Though we still have a few flaky tests we see in CI sometimes (though certainly not 25% of the time, otherwise we'd see a failure on every PR).

[sarahec]

It appears to be load-sensitive. I'll see if I can get you a traceback.

[Dreamsorcerer]

I've just looked at the test, and it's only:

async def test_aiohttp_request_ctx_manager_not_found() -> None:
    with pytest.raises(aiohttp.ClientConnectionError):
        async with aiohttp.request("GET", "http://wrong-dns-name.com"):
            assert False

I'm not clear what it's even trying to test. Seems to me like it relies on that domain not being registered, which is rather weird...