Ensure automatically provisioned environment is torn down

[vytas7]

Fixes #3600.

• ran the linter to address style issues (tox -e fix)
• wrote descriptive pull request text (see the newsfragment)
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
• updated/extended the documentation

[vytas7]

I had no energy to write any tests either since the issue doesn't affect me, and there exists an easy workaround.

But if you could provide pointers how such a test could look like, I can try to hack together something...

[webknjaz]

But if you could provide pointers how such a test could look like, I can try to hack together something...

@vytas7 maybe just extend/copy

tox/tests/tox_env/python/virtual_env/package/test_package_pyproject.py

Lines 469 to 487 in b33a43c

	@pytest.mark.usefixtures("enable_pip_pypi_access")
	def test_pyproject_installpkg_pep517_envs(tox_project: ToxProjectCreator, pkg_with_pdm_backend: Path) -> None:
	# Regression test for #3512
	tox_ini = """
	[tox]
	envlist = dummy1,dummy2
	[testenv:dummy1]
	commands =
	python -c print(1)
	[testenv:dummy2]
	commands =
	python -c print(42)
	"""
	sdist = pkg_with_pdm_backend / "dist" / "skeleton-0.1.1337.tar.gz"
	proj = tox_project({"tox.ini": tox_ini}, base=pkg_with_pdm_backend)
	result = proj.run("--installpkg", str(sdist))
	result.assert_success()

/

tox/tests/tox_env/python/virtual_env/package/test_package_cmd_builder.py

Lines 180 to 196 in b33a43c

	def test_run_installpkg_targz(
	tox_project: ToxProjectCreator,
	pkg_with_sdist: Path,
	enable_pip_pypi_access: str | None, # noqa: ARG001
	) -> None:
	project = tox_project({
	"tox.ini": """
	[tox]
	envlist = base, flake8
	[testenv]
	package = sdist
	[testenv:base]
	[testenv:flake8]
	"""
	})
	outcome = project.run(f"--installpkg={pkg_with_sdist}")
	outcome.assert_success()

adding a lightweight dep?

[vytas7]

adding a lightweight dep?

Right, I hacked something together based on the existing examples. I needed to add a mirrored Devpi index to be able to fetch setuptools in the automatically provisioned environment, not sure if there is a better way.