I think the test is whether you can grep an unfamiliar code base to find the implementation of existing functionality, understand it, and modify it to add very

I think the test is whether you can grep an unfamiliar code base to find the implementation of existing functionality, understand it, and modify it to add very similar functionality. Like do the commands have to be registered somewhere? Is it a string mapping the operation name to a function pointer? A cascading if-then statement? Etc. etc. It's just a test of diving in and understanding existing code in a relatively short amount of time.