test_generated_extension FAILED on tox 4 with envlist = default

[jfishe]

Describe your use-case

test_generated_extension fails with tox version 4, when envlist = default is present in tox.ini. It passes when envlist is empty.

I've tried without uv--i.e., with python -m venv .venv, so this is not uv specific.

putup --custom-extension pre-commit-ruff
cd pyscaffoldext-pre-commit-ruff
uvx --isolated --from='tox>4.0' tox -vvv > tox-4.21.2.txt 2>&1 # fails
uvx --isolated --from='tox<4.0' tox -vvv > tox-3.28.0.txt 2>&1 # succeeds

tox.ini contains:

[tox]
minversion = 3.24
envlist = default
isolated_build = True

Describe the solution you would like to see for your use-case

Please update the template to tox version 4 and remove envlist and isolated_build (v4 default), e.g:

[tox]
minversion = 4.0

[jfishe]

This appears to be the relevant output when envlist = default is selected. It is not present when envlist is empty.

default: 1539 I create virtual environment via CPython3Posix(dest=/home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default, clear=False, no_vcs_ignore=False, global=False) [virtualenv/run/session.py:50]
default: 1539 D create folder /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/bin [virtualenv/util/path/_sync.py:12]
default: 1540 D create folder /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/lib/python3.12/site-packages [virtualenv/util/path/_sync.py:12]
default: 1540 D write /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/pyvenv.cfg [virtualenv/create/pyenv_cfg.py:33]
default: 1540 D 	home = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/bin [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D 	implementation = CPython [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D 	version_info = 3.12.7.final.0 [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D 	virtualenv = 20.26.6 [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D 	include-system-site-packages = false [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D 	base-prefix = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D 	base-exec-prefix = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D 	base-executable = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/bin/python3.12 [virtualenv/create/pyenv_cfg.py:38]
default: 1540 D symlink /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/bin/python3.12 to /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/bin/python [virtualenv/util/path/_sync.py:32]
default: 1540 D create virtualenv import hook file /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/lib/python3.12/site-packages/_virtualenv.pth [virtualenv/create/via_global_ref/api.py:91]
default: 1541 D create /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/lib/python3.12/site-packages/_virtualenv.py [virtualenv/create/via_global_ref/api.py:94]
default: 1541 D ============================== target debug ============================== [virtualenv/run/session.py:52]
default: 1541 D debug via /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/bin/python /home/jdfen/.cache/uv/archive-v0/DU_EUPJ52wyY9fKFcqev9/lib/python3.12/site-packages/virtualenv/create/debug.py [virtualenv/create/creator.py:200]
default: 1541 D {
  "sys": {
    "executable": "/home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/bin/python",
    "_base_executable": "/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/bin/python3.12",
    "prefix": "/home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default",
    "base_prefix": "/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu",
    "real_prefix": null,
    "exec_prefix": "/home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default",
    "base_exec_prefix": "/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu",
    "path": [
      "/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python312.zip",
      "/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12",
      "/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/lib-dynload",
      "/home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/lib/python3.12/site-packages"
    ],
    "meta_path": [
      "<class '_virtualenv._Finder'>",
      "<class '_frozen_importlib.BuiltinImporter'>",
      "<class '_frozen_importlib.FrozenImporter'>",
      "<class '_frozen_importlib_external.PathFinder'>"
    ],
    "fs_encoding": "utf-8",
    "io_encoding": "utf-8"
  },
  "version": "3.12.7 (main, Oct  8 2024, 00:20:25) [Clang 18.1.8 ]",
  "makefile_filename": "/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/config-3.12-x86_64-linux-gnu/Makefile",
  "os": "<module 'os' (frozen)>",
  "site": "<module 'site' (frozen)>",
  "datetime": "<module 'datetime' from '/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/datetime.py'>",
  "math": "<module 'math' (built-in)>",
  "json": "<module 'json' from '/home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/lib/python3.12/json/__init__.py'>"
} [virtualenv/run/session.py:53]
default: 1558 I add seed packages via FromAppData(download=False, pip=bundle, via=copy, app_data_dir=/home/jdfen/.local/share/virtualenv) [virtualenv/run/session.py:57]
default: 1559 D got embed update of distribution %s from ('pip', PosixPath('/home/jdfen/.local/share/virtualenv/wheel/3.12/embed/3/pip.json')) [virtualenv/app_data/via_disk_folder.py:131]
default: 1560 D install pip from wheel /home/jdfen/.cache/uv/archive-v0/DU_EUPJ52wyY9fKFcqev9/lib/python3.12/site-packages/virtualenv/seed/wheels/embed/pip-24.2-py3-none-any.whl via CopyPipInstall [virtualenv/seed/embed/via_app_data/via_app_data.py:49]
default: 1561 D copy directory /home/jdfen/.local/share/virtualenv/wheel/3.12/image/1/CopyPipInstall/pip-24.2-py3-none-any/pip to /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/lib/python3.12/site-packages/pip [virtualenv/util/path/_sync.py:40]
default: 1580 D copy /home/jdfen/.local/share/virtualenv/wheel/3.12/image/1/CopyPipInstall/pip-24.2-py3-none-any/pip-24.2.virtualenv to /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/lib/python3.12/site-packages/pip-24.2.virtualenv [virtualenv/util/path/_sync.py:40]
default: 1580 D copy directory /home/jdfen/.local/share/virtualenv/wheel/3.12/image/1/CopyPipInstall/pip-24.2-py3-none-any/pip-24.2.dist-info to /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/lib/python3.12/site-packages/pip-24.2.dist-info [virtualenv/util/path/_sync.py:40]
default: 1581 D generated console scripts pip pip3.12 pip3 pip-3.12 [virtualenv/seed/embed/via_app_data/pip_install/base.py:43]
default: 1581 I add activators for Bash, CShell, Fish, Nushell, PowerShell, Python [virtualenv/run/session.py:63]
default: 1583 D write /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/default/pyvenv.cfg [virtualenv/create/pyenv_cfg.py:33]
default: 1583 D 	home = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/bin [virtualenv/create/pyenv_cfg.py:38]
default: 1583 D 	implementation = CPython [virtualenv/create/pyenv_cfg.py:38]
default: 1583 D 	version_info = 3.12.7.final.0 [virtualenv/create/pyenv_cfg.py:38]
default: 1583 D 	virtualenv = 20.26.6 [virtualenv/create/pyenv_cfg.py:38]
default: 1583 D 	include-system-site-packages = false [virtualenv/create/pyenv_cfg.py:38]
default: 1583 D 	base-prefix = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu [virtualenv/create/pyenv_cfg.py:38]
default: 1583 D 	base-exec-prefix = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu [virtualenv/create/pyenv_cfg.py:38]
default: 1583 D 	base-executable = /home/jdfen/.local/share/uv/python/cpython-3.12.7-linux-x86_64-gnu/bin/python3.12 [virtualenv/create/pyenv_cfg.py:38]
.pkg: 1587 D package .tmp/package/20/pyscaffoldext_pre_commit_ruff-0.0.post1.dev1+g3e1993e.tar.gz links to .pkg/dist/pyscaffoldext_pre_commit_ruff-0.0.post1.dev1+g3e1993e.tar.gz (/home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox) [tox/util/file_view.py:39]

Installing collected packages: distlib, tomlkit, setuptools, pyyaml, pluggy, platformdirs, packaging, nodeenv, iniconfig, identify, filelock, execnet, coverage, configupdater, colorama, chardet, cfgv, cachetools, virtualenv, setuptools-scm, pytest, pyproject-api, tox, pytest-xdist, pytest-cov, pyscaffold, pre-commit
Successfully installed cachetools-5.5.0 cfgv-3.4.0 chardet-5.2.0 colorama-0.4.6 configupdater-3.2 coverage-7.6.3 distlib-0.3.9 execnet-2.1.1 filelock-3.16.1 identify-2.6.1 iniconfig-2.0.0 nodeenv-1.9.1 packaging-24.1 platformdirs-4.3.6 pluggy-1.5.0 pre-commit-4.0.1 pyproject-api-1.8.0 pyscaffold-4.6 pytest-8.3.3 pytest-cov-5.0.0 pytest-xdist-3.6.1 pyyaml-6.0.2 setuptools-75.1.0 setuptools-scm-8.1.0 tomlkit-0.13.2 tox-4.21.2 virtualenv-20.26.6
default: 5506 I exit 0 (3.92 seconds) /home/jdfen/dev/pyscaffoldext-pre-commit-ruff> python -I -m pip install configupdater 'importlib-metadata; python_version < "3.8"' pre-commit 'pyscaffold<5.0a0,>=4.6' pytest pytest-cov pytest-xdist setuptools-scm tox virtualenv pid=106090 [tox/execute/api.py:286]
default: 5506 W install_package> python -I -m pip install --force-reinstall --no-deps /home/jdfen/dev/pyscaffoldext-pre-commit-ruff/.tox/.tmp/package/20/pyscaffoldext_pre_commit_ruff-0.0.post1.dev1+g3e1993e.tar.gz [tox/tox_env/api.py:426]
Processing ./.tox/.tmp/package/20/pyscaffoldext_pre_commit_ruff-0.0.post1.dev1+g3e1993e.tar.gz