What is proper testing? 100% code coverage doesn't mean you covered 100% of the paths in your code. Maybe you hit a line, but didn't hit that line with particul

What is proper testing? 100% code coverage doesn't mean you covered 100% of the paths in your code. Maybe you hit a line, but didn't hit that line with particular inputs that expose a bug. I'd argue that unit testing is a design tool, not necessarily a tenant of "proper testing". It will be impossible to test every unit of code super thoroughly. Even 1 line of code that accepts 1 input has an infinite number of states it can be in. Proper testing is exercising all the functionality via the UI and understanding your program and it's use cases. If you're doing end to end testing, the codes architecture does not matter because your program is basically a black box.