Automated tests

[salastro]

They basically exist in the __main__ in func.py For reference:

• https://www.youtube.com/watch?v=DhUpxWjOhME
• https://stackoverflow.com/questions/27954702/unittest-vs-pytest
• https://docs.python.org/3/library/unittest.html
• https://docs.pytest.org/

[salastro]

Windows is still not working, but will close this issue for now.