Linux didn't have unit tests. For the most part we had Linus eyeballing every line of code before merging it. And if you wrote an extra if or did a boo boo usi

Linux didn't have unit tests. For the most part we had Linus eyeballing every line of code before merging it. And if you wrote an extra if or did a boo boo using the wrong enum flag or you overran your buffer, you were flogged, berated and pitied in front of an international audience of engineers. I don't know how things go now in the post-sensitivity world.