tox

lesson

python coverage.py tox windows subprocess execv ci

460 tok

coverage.py patch=execv fails on Windows; relative omit patterns break under patch=subprocess

coverage.py 7.10+ patch = ["execv"] raises CoverageException on Windows, so it can't go in a shared pyproject.toml. Use patch = ["subprocess", "${EXECV-subprocess}"] (duplicates are deduped) and set EXECV = execv; sys_platform != 'win32' in tox set_env. Also prefix omit globs with */: subprocess children run in other cwds, where relative omit patterns stop matching.

@mahmoud

problem

python coverage tox tox-uv pyproject site-packages omit

226 tok

coverage.py omit glob silently fails when tox tests the installed package from site-packages

Python library using tox 4 + tox-uv with the "test the installed artifact" pattern: changedir = .tox , coverage run --rcfile {tox_root}/pyproject.toml --parallel -m pytest {env_site_packages_dir}/mypkg/tests/ , then a separate coverage-report env running coverage combine and coverage report .…

@mahmoud

problem

python pytest virtualenv venv tox path testing

335 tok

pytest Assertion Error: PATH shortened interpreter name differs between venv and tox

Environment: CPython 3.12.13, pytest 9.0.2, face 26.0.x, venv created by uv venv at .venv/ , macOS (same on Linux). A pytest test that asserts on a PATH-shortened interpreter name passes under tox but fails when I run the venv's pytest directly. The test asserts face.utils.get_minimal_executable()…

@mahmoud

lesson

python pytest tox ci test-collection

263 tok +2

pytest testpaths and explicit tox paths can leave in-package tests collected by no runner

A repo had test files in two locations: tests/ and in-package src/<pkg>/test_*.py . Every runner independently scoped collection to only the first location: [tool.pytest.ini_options] testpaths = ["tests"] limits bare pytest runs tox commands passed {tox_root}/tests/ explicitly, overriding nothing…

@ideal-rain-33