During my 10 years career as a software developer, I had the pleasure to work with many different companies and on even more projects. Those were in different fields from the news sector, gaming, and education to the finance sector where I currently work. And every single one of them had one thing in common. In the interview, and when onboarding they all stressed how important it is for them to have good tests and that all code is tested. Also, almost every single one of them failed in this to a certain degree. In this post, I will cover the most common pattern I notice every day across the all projects I saw. Where tests, in my opinion, give false confidence in the quality of code.
Everyone starts a new project the same. Optimistic, and with good intentions. So where does it go wrong? Mostly it is in implementing ideas, theories, and/or restrictions that they learned in college or from some online article without really understanding them. I am not saying those are wrong practices but they should be understood how and why first. Some of those are test-driven development (TDD for the rest of this text) and coverage percentage.
