changedir not working

[zkurtz]

Issue

I'm using tox specifically so that I can catch errors that pytest would otherwise miss. For example, if I add a package resource to my files and include a unit test that loads that resource, pytest will think everything is fine. Noticing that my package doesn't load because I failed to include the new resource in package data happens only later, when I try to install the package in a new environment using the whl.

I've found that running tox with this configuration works as desired, raising an error where I try to load a package resource that was not added to package data:

[tox]
isolated_build=True

[testenv]
description = Run unit tests
deps =
    pytest
dependency_groups = extras
changedir = {envtmpdir}  # suggested by https://blog.ganssle.io/articles/2019/08/test-as-installed.html
commands = python -m pytest {posargs} {toxinidir}

However, deleting

deps =
    pytest

and replacing it with

runner = uv-venv-lock-runner
with_dev = true

puts me back where I started; tox runs without noticing the problem. Please let me know if it's obvious what's going on here -- if not I may follow up with a reproducable example.

Environment

• OS: OSX 15.1.1

[ssbarnea]

@zkurtz Feel free to make PR to fix it. Basically every option supported by Tox own venv implementation will need to be implemented by this as they do not magically work.

[zkurtz]

I'm interested to work on this if someone can provide some suggestions on how to get started. I'll poke around a bit.