Redesign tests to only check inner and more corrupt potential parts of functions

[aliinreallife]

Intro:

Because our API isn't stable yet, and we're going to have a lot of big changes, focusing on tests isn't the best option.
Of course in time we will go and focus on that, the design of tests now will go from 0 to 100 of every question with given JSON and check every status code every expected predict, potential values etc.

Tasks:

For now, we design some simple test on inner parts of each function and don't go throng all the potential/predict/… Functions to check integrity of every them.

• Remove test_main.py (temporary)
• Code inner test #133