Python Testing with pytest

tox: Testing Multiple Configurations

tox is a command-line tool that allows you to run your complete suite of tests in multiple environments. We’re going to use it to test the Tasks project in multiple versions of Python. However, tox is not limited to just Python versions. You can use it to test with different dependency configurations and different configurations for different operating systems.

In gross generalities, here’s a mental model for how tox works:

tox uses the setup.py file for the package under test to create an installable source distribution of your package. It looks in tox.ini for a list of environments and then for each environment…

1. tox creates a virtual environment in a .tox directory.
2. tox pip installs some dependencies.
3. tox ...