macos: test_uv_venv_skip_missing_interpreters_fail test fails

[ssbarnea]

Issue

Environment

Provide at least:

• OS:

Output of pip list of the host Python, where tox is installed

macos

Output of running tox

Output of tox -rvv

========================================================================== FAILURES ==========================================================================
________________________________________________________ test_uv_venv_skip_missing_interpreters_fail _________________________________________________________

tox_project = <function init_fixture.<locals>._init at 0x10350a200>

    def test_uv_venv_skip_missing_interpreters_fail(tox_project: ToxProjectCreator) -> None:
        project = tox_project({
            "tox.ini": "[tox]\nskip_missing_interpreters=false\n[testenv]\npackage=skip\nbase_python=1.0"
        })
        result = project.run("-vv")
>       result.assert_failed(code=1)

tests/test_tox_uv_venv.py:123:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = code: -1
cmd: /Users/ssbarnea/code/os/tox-uv/.tox/py/bin/python -m tox -vv
cwd: /private/var/folders/32/1xrphgzd4xv777... Python request `1` from explicit request
  × Invalid version request: Python <3 is not supported but 1 was requested.

code = 1

    def assert_failed(self, code: int | None = None) -> None:
        status_match = self.code != 0 if code is None else self.code == code
>       assert status_match, f"should be {code}, got {self}"  # noqa: S101
E       AssertionError: should be 1, got code: -1
E         cmd: /Users/ssbarnea/code/os/tox-uv/.tox/py/bin/python -m tox -vv
E         cwd: /private/var/folders/32/1xrphgzd4xv777syxjtkpdw80000gn/T/pytest-of-ssbarnea/pytest-90/test_uv_venv_skip_missing_inte0/p
E         standard output
E         ROOT: 9676 D setup logging to DEBUG on pid 36143 [tox/report.py:222]
E         py: 9697 W venv> /Users/ssbarnea/code/os/tox-uv/.tox/py/bin/uv venv -p 1 --allow-existing -v /private/var/folders/32/1xrphgzd4xv777syxjtkpdw80000gn/T/pytest-of-ssbarnea/pytest-90/test_uv_venv_skip_missing_inte0/p/.tox/py [tox/tox_env/api.py:427]
E         py: 9715 W skipped because could not find python interpreter with spec(s): 1 [tox/session/cmd/run/single.py:50]
E           py: SKIP (0.02 seconds)
E           evaluation failed :( (0.04 seconds)
E
E         standard error
E         DEBUG uv 0.5.2 (195f4b634 2024-11-14)
E         DEBUG Using Python request `1` from explicit request
E           × Invalid version request: Python <3 is not supported but 1 was requested.
E
E       assert False

.tox/py/lib/python3.12/site-packages/tox/pytest.py:361: AssertionError

Minimal example

[ssbarnea]

Debugging update

I was able to spot that self.request.allow from https://github.com/tox-dev/tox/blob/5d880fc93c22d37585f838f8f5359be2714223bb/src/tox/execute/local_sub_process/__init__.py#L179 contains only:

(Pdb) self.request.allow
['/Users/ssbarnea/.config/mise/installs/python/3.12.7/bin/uv']

And that is why it fails.

When run without the tox-uv plugin this attribute contains ['.../.tox/py/bin/*'] and I guess that is why it works.

This is happening with the minimal tox.ini file from tha test, one that does not even have any allowlist_externals or even commands inside.