I once ran into an issue where a base class's method's signature changed thus breaking some subclasses. No compiler warning but also no refactoring support eith

I once ran into an issue where a base class's method's signature changed thus breaking some subclasses. No compiler warning but also no refactoring support either. If you ran tests only on the base class you would be fine. Especially if different people were responsible for the base class and subclasses.... Wonder if Python tools have refactoring support...