Tox

Available on Docker Hub as mikicz/tox.

This image is intended for running tox with Python 3.7, 3.8, 3.9, 3.10, 3.11 and PyPy3. Its goal is to make testing your code against multiple Python versions quick and easy. The image contains several ONBUILD commands for initializing the tox environments with your project's requirements.txt files.

Usage

The Dockerfile contains the following ONBUILD commands:

ONBUILD COPY install-prereqs*.sh requirements*.txt tox.ini /app/
ONBUILD ARG SKIP_TOX=false
ONBUILD RUN bash -c " \
    if [ -f '/app/install-prereqs.sh' ]; then \
        bash /app/install-prereqs.sh; \
    fi && \
    if [ $SKIP_TOX == false ]; then \
        TOXBUILD=true tox; \
    fi"

This means your project must contain a tox.ini file.

You can also optionally include an install-prereqs.sh script for installing prerequisites of the project requirements.

To avoid the tox environments being rebuilt every time you want to test your code, tox is run twice - first with the TOXBUILD environment variable set to true, and second without it being set:

$ TOXBUILD=true tox

Executed during the build phase to initialize all of the environments. It is expected not to install your code nor run your tests; it should only install the requirements which your project needs to be tested.

This step can be skipped by specifying --build-arg SKIP_TOX=true in the build phase.
$ tox

Executed during the run phase to test your code.

When your requirements or tox configuration changes, both steps are run. When your code changes, only the second step is run, saving valuable time. This also ensures that your code is always tested in a completely clean environment.

Example tox.ini supporting the TOXBUILD environment variable:

[tox]
envlist = py37,py38,py39,py310,py311,pypy3
skipsdist = {env:TOXBUILD:false}

[testenv]
passenv = LANG
whitelist_externals = true
deps =
    -rrequirements_test_runner.txt
    -rrequirements_static_analysis.txt
    -rrequirements_test.txt
commands = {env:TOXBUILD:./tests.sh --static-analysis}

For a full example, see the python-pypi-template project, which uses this image.

License

mikicz/docker-tox

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