tox-factor

What is tox-factor?

tox-factor enables running a subset of tox test envs, based on factor matching.

Okay, but what does that actually mean?

Take the following tox config:

[tox]
envlist =
    py{35,36,37}-django{20,21,22}-{redis,memcached}

The above defines 18 test envs, based on three factor groups - the python version, the django version, and a caching backend. While the above is powerful, tox does not provide a way to run builds based on a subset of those factors. For example, the call to run all Python 3.7 builds would be:

$ tox -e py37-django20-redis,py37-django20-memcached,py37-django21-redis,py37-django21-memcached,py37-django22-redis,py37-django22-memcached

tox-factor functions similarly to the -e <env name> argument, except it runs all envs that match the given factor. The six py37 builds could be ran with:

$ tox -f py37

In addition to ease of use when running tox locally, this is useful for some CI setups. For example, two common tox CI patterns are to either:

• Define a CI job for each tox test env. e.g.,

  tox -e py37-django20-redis

• Define a CI job for a common environment that runs multiple test envs. e.g.,

  tox -e py37-django20-redis,py37-django20-memcached,...

For the latter case, this plugin eases maintenance of CI, as it could be shortened to tox -f py37. Additionally, take the following update to the above tox config:

[tox]
envlist =
    py{35,36,37}-django{20,21,22}-{redis,memcached}
    py{36,37,38}-django{30}-{redis,memcached}

By using tox-factor, it wouldn't be necessary to update the Python 3.7 build, as the new py37-django30-* env would be matched automatically.

Verifying the matched test envs

If you want to verify which test envs are actually ran, combine the factor matching with the -l flag. This will display all test envs that match. e.g.,

$ tox -f py37 -l
py37-django20-redis
py37-django20-memcached
py37-django21-redis
py37-django21-memcached
py37-django22-redis
py37-django22-memcached

Usage details

The factor option accepts a comma-separated list (similar to the -e option).

$ tox -f py27,py37 -l
py27-django111
py37-django21

Alternatively, factors can be provided via the TOXFACTOR environment variable:

$ TOXFACTOR=py27,py37 tox -l
py27-django111
py37-django21

Factors can also match non-generative env names. For example, given the following tox config:

[tox]
envlist =
    py{35,36,37}-django20

[testenv:list]

Then the following would match:

$ tox -f py37,lint -l
py37-django20
lint

Factors are always superseded by a given toxenv. For example, tox-factor would noop in the following cases:

$ tox -f py37 -e py35-django21 -l
py35-django21

$ TOXENV=py35-django21 tox -f py37 -l
py35-django21

Factors do not support partial matching. tox -f py3 would not match py37. However, factors may match disparate dash-separated parts. Given the following:

[tox]
envlist =
    py{35,36,37}-django{20,21,22}-{redis,memcached}

Then tox -f py37-redis would match:

py37-django20-redis
py37-django21-redis
py37-django22-redis

Release Process

• Update changelog
• Update package version in setup.py
• Create git tag for version
• Upload release to PyPI test server
• Upload release to official PyPI server

$ pip install -U pip setuptools wheel twine
$ rm -rf dist/ build/
$ python setup.py sdist bdist_wheel
$ twine upload -r test dist/*
$ twine upload dist/*

Thanks

This code is largely based off the work done by @ryanhiebert in tox-travis. Without his efforts, it would have taken significantly more time to write and test this package.

License

See: LICENSE

BSD 3-Clause License

Copyright (c) 2019, Ryan P Kilby All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.