I have a hard time imagining a large monolithic function where I wouldn't want to test any parts, ever. Also, I find that most people can only keep a certain am

I have a hard time imagining a large monolithic function where I wouldn't want to test any parts, ever. Also, I find that most people can only keep a certain amount of code in their head at the same time, so even if you have a monolithic function, I think you'd still want nested helper functions so that the more complicated portions of the code that are hard to read and understand stay manageable.