have enough disk space and a good Internet connection, or a lot of patience!  
```bash
$ RUN_SLOW=yes python -m pytest -n auto --dist=loadfile -s -v ./tests/
```  
`unittest` is fully supported, here's how to run tests with it:  
```bash
$ python -m unittest discover -s tests -t . -v
$ python -m unittest discover -s examples -t examples -v
```