Great job writing your tests! Here are a couple of tips for the future:

• Put your tests in a separate file, and then simply import your main application into the testing file.
• Examine these docs for help following convention and having good structure for your test file: https://docs.python.org/3/library/unittest.html
• Keep your outer scope functions to run your app in your " if name == "main": " boolean in your app's file, and then running " pytest <name_of_testfile>.py " will run all your functions with "test" in the name of the functions.
• Include a .gitignore file in your project directory that contains *.pyc so none of your files that result from testing end up in your git repo.

• Nice use of docstrings
• You could improve commenting throughout your code within the functions to describe what is happening more clearly
• Good job making your code modular and organizing everything into functions
• Clean up the TODOs after you are finished with them, many of your TODOs would make nice comments if you simply delete the “TODO” part
• Good job using semantic variable naming