Unit tests wouldn't help with that, because it doesn't cover the interaction of all the classes when they pass data on to each other; and they would probably take me months;
I would need integration tests, for which I first need to understand how the code works together
Data flows through functions as well... Or between classes that are injected , no hierarchies required;
Anyways I can't make wishes about how the code was written
I would need integration tests, for which I first need to understand how the code works together