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PyTesting while multiprocessing?

No worries!

In this blog post I talk about how to do Python (py)testing while multiprocessing.

This repo is the accompanying code. Feel free to read it as it is (lots of comments in the code) or follow the story in the blog (There are pictures).

Enjoy!

Setup and run:

Setup is based on anaconda. I like to fix only the major packages, the rest, should be installed at their best version available.

conda create -y --copy -n demo-mp python=3.9.2 pytest pytest-mock pytest-cov

That's it. Load the code in your IDE, configure it and run the tests, of course! Check the blog post for more descriptions!

Coverage tests

Run More Run/Debug -> Run Pytest with Coverage

Note the lack of coverage in multiprocessing.

To have reports from multiprocessing (Will break the "regular" coverage)

  1. Make .coveragerc in test folder with:

.coveragerc file:

    [run]
    concurrency=multiprocessing
    branch = True

  1. Run it again from IDE. Now there is no coverage report shown!

  2. Navigate where the IDE is saving the coverage files PyCharm: ~/.cache/JetBrains/PyCharmXXXX.Y/coverage

  3. Make sure the conda env is active. Run

    coverage combine .coverage.; coverage xml

  4. Now, back to IDE, Run -> Show Coverage Data -> Plus -> (navigate to xml)

Hint: If you want back the IDE coverage, disable the first line in .coveragerc

Enjoy!