Clean Odif You Can't Be Tested

A lot of times when we talk about unit testing, we kind of give a few things a kind of free passes. I license to dod not be tested. It's hard to test h exploratory code because you don't know what you're doing yet. So i thought this was an absolutely fantastic point that i'd never even really thought about. The thing that caught me on this is, actually seems like it's more important to do it for a third party than it would be your own cod right?