[Tox](https://tox.readthedocs.io/en/latest/) is a great project where you can automate your testing using virtual environments.
First install tox
```bash
pip install tox
```
I like to write my tests in Python's native [`unittest`](https://docs.python.org/3/library/unittest.html) format. Tests should be stored in a `tests` directory.
I then combine it with the `coverage` library to tell me how much of my code that my test cases cover. To quickly insert my personal opinion, I never aim for 100% test coverage since there's typically overhead in maintaining that.
This all gets described in a `tox.ini` file. This file should live in the same directory as your `setup.py`
```ini
[tox]
envlist =
py38
[testenv]
deps = coverage
commands =
coverage run --source=tests,library -m unittest discover tests
