unit tests (using PHPUnit). It has the following additional requirements:
* [behave test framework](https://behave.readthedocs.io) >= 1.2.5
-* [nose](https://nose.readthedocs.io)
* [phpunit](https://phpunit.de) >= 7.3
* [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer)
sudo apt install php-cgi phpunit php-codesniffer \
python3-pip python3-setuptools python3-dev
-pip3 install --user behave nose mkdocs
+pip3 install --user behave mkdocs
```
The `mkdocs` executable will be located in `.local/bin`. You may have to add