I am developing a tool for python programmers but to test to the tool I need python code with unit tests of various difficulty to test my code on. I was wondering the best way to go about this (im a fairly new programmer).

So far I have been testing my program on just some python code with basic programs like factorial in a testing folder within my project. but now I need to test on projects with unit tests and im unsure first how to find these kinds of projects easily on GitHub, and how to really test on a GitHub repos project.