I disagree unless the tests are reasonably high level.
Half the time the thing you’re testing is so poorly defined that the only way to tighten that definition is to iterate.
In this sense, you’re wasting time writing tests until you’ve iterated enough to have something worth testing.
At that point, a couple of regression tests offer the biggest bang for buck so you can sanity check things are still working when you move on to another function and forget all about this one
Jokes on you, my first job was editing files directly in production. It was for a webapp written in Classic ASP. To add a new feature, you made a copy of the current version of the page (eg
index2_new.asp
becameindex2_new_v2.asp
) and developed your feature there by hitting the live page with your web browser.When you were ready to deploy, you modified all the other pages to link to your new page
Good times!