It's actually not as common as it sounds from reading HN. There is definitely a bias based on the fact that the big tech companies do it and startups tend to do

It's actually not as common as it sounds from reading HN. There is definitely a bias based on the fact that the big tech companies do it and startups tend to do it. Which many commenters here have experience with. A lot of more traditional software development roles do not have much testing. Sometimes they will have a quick online timed test or a simple question on an intitial phone screen. That isn't to say that all companies do not have testing. But it's definitely the startup and big tech worlds that have the majority of it.