Python testing tutorial

Set up

1. Create virtual environment: python -m venv .venv --prompt pytest-tutorial
2. Activate the virtual environment: source .venv/bin/activate
3. Install the tutorial module: pip install -e .
4. Install other dependencies: pip install -r requirements.txt
5. Run the tests pytest -v -s

Take a look through tests/test_mocks.py for various ways on using python mocks and patching to test things.