Example project demonstrating using Django’s test runner with Coverage.py

Example project demonstrating using Django’s test runner with Coverage.py

Set up with:

python -m venv --prompt . venv
source venv/bin/activate
python -m pip install -r requirements.txt

Run tests in parallel mode with coverage with this combination of commands:

coverage erase && coverage run manage.py test --parallel 2 && coverage combine && coverage report

You can also omit the number 2 to use as many test processes as there are CPU cores. But on Django < 4.0 this will trigger a warning:

CoverageWarning: No data was collected. (no-data-collected)

This warning is due to Django launching more test processes than there are test cases, meaning there’s no coverage data to collect in those processes. This was fixed in Ticket #27734.

With larger projects using you won’t encounter this warning except when running a subset of tests.

Also note that manage.py has been patched to run on macOS, as per this blog post.