Lets talk about test

When I'm learning something new, these are the steps I take:

In almost all the sites (if not all) they mention that adding tests to our applications is very important, so when I get to that part I get excited, I think Finally! I'll learn to add tests, but then I get there and start to think Wait, what should I test?, and then everything goes downhill and leave it there. So lets talk about test...

This is a companion discussion topic for the original entry at https://kacos.pro/tech-stuff/lets-talk-about-test