You're absolutely right: functional code is the source of the readability. But writing unit tests incentivizes engineers to keep things functional. What's a be

You're absolutely right: functional code is the source of the readability. But writing unit tests incentivizes engineers to keep things functional. What's a better term than "dependency injection"? What should I call an argument whose default is always used in production code, but is there to make passing a mock easy? I'm not trying to be snide -- I'm genuinely curious.