Pytest plugin to only run tests affected by changes
pytest-cagoule is a pytest plugin to find which tests interact with the code you’ve just changed.
Collect coverage information using --cagoule-capture
Then, to run the subset of tests that touch a particular file, use cagoule-select=<filename>[:line number], e.g.
If you are using git, cagoule can find the files and lines that have changes in the current working directory:
or for any other diff spec that git can parse, using --diff=<spec>, e.g.
You probably want to configure your CI server to handle capturing.
Install pytest-cagoule using pip:
pip install pytest-cagoule
Only lines executed during individual test runs are captured. This often excludes module level code, which is executed at import time, before the test starts. Also, tests are of course registered against the code as it was when data was captured, so if using --diff, no new tests will be included.
Idea from nose-knows
MIT. See LICENSE for details