Add unit tests for setup

[rogerkuou]

Inspired by this issue from the Capentry Incubator repo: https://github.com/carpentries-incubator/geospatial-python/issues/123

Let's:

• [ ] Create a unit test (`test_setup.py) to test all dependencies are running and working
• [ ] Add a one line command (python test_setup.py) in the setup page that the uses can run to verify the setup is working.