I'm trying to imagine what on earth your private methods can be doing that wouldn't be affected by the public interface. There should be no situation where the

I'm trying to imagine what on earth your private methods can be doing that wouldn't be affected by the public interface. There should be no situation where the same exact call in the public interface could take multiple different paths in the private method. The only thing I can think of that could make that happen would be some dependancy, which should be mocked at the top level to control these cases.