pytest-forked: run each test in a forked subprocess

.. warning::

this is a extraction of the xdist --forked module,
future maintenance beyond the bare minimum is not planned until a new maintainer is found.

This plugin does not work on Windows because there's no fork support.

• --forked: run each test in a forked subprocess to survive SEGFAULTS or otherwise dying processes.

|python| |version| |ci| |pre-commit| |black|

.. |version| image:: http://img.shields.io/pypi/v/pytest-forked.svg :target: https://pypi.python.org/pypi/pytest-forked

.. |ci| image:: https://github.com/pytest-dev/pytest-forked/workflows/build/badge.svg :target: https://github.com/pytest-dev/pytest-forked/actions

.. |python| image:: https://img.shields.io/pypi/pyversions/pytest-forked.svg :target: https://pypi.python.org/pypi/pytest-forked/

.. |black| image:: https://img.shields.io/badge/code%20style-black-000000.svg :target: https://github.com/ambv/black

.. |pre-commit| image:: https://results.pre-commit.ci/badge/github/pytest-dev/pytest-forked/master.svg :target: https://results.pre-commit.ci/latest/github/pytest-dev/pytest-forked/master

Installation

Install the plugin with::

pip install pytest-forked

or use the package in develope/in-place mode with a checkout of the pytest-forked repository_ ::

pip install -e .

Usage examples

If you have tests involving C or C++ libraries you might have to deal with tests crashing the process. For this case you may use the boxing options::

pytest --forked

which will run each test in a subprocess and will report if a test crashed the process. You can also combine this option with running multiple processes via pytest-xdist to speed up the test run and use your CPU cores::

pytest -n3 --forked

this would run 3 testing subprocesses in parallel which each create new forked subprocesses for each test.

You can also fork for individual tests::

@pytest.mark.forked
def test_with_leaky_state():
    run_some_monkey_patches()

This test will be unconditionally boxed, regardless of CLI flag.

.. _pytest-forked repository: https://github.com/pytest-dev/pytest-forked