Tips

To run tests

Install requirements: pip install -r test-requirements.txt (possibly in a virtualenv)
Actually run the tests: pytest pytest_trio
Format the code with black .

To make a release

Update the version in pytest_trio/_version.py
Run towncrier to collect your release notes.
Review your release notes.
Check everything in.
Double-check it all works, docs build, etc.
Build your sdist and wheel: python setup.py sdist bdist_wheel
Upload to PyPI: twine upload dist/*
Use git tag to tag your version.
Don't forget to git push --tags.