Unit tests are usefule or uneeded in develepment (Node.js, React,Angular,etc...)

They may seem like something that slow you down, but you will love them a year into a release when you have to add that thing that "could" break something

@viking8
that's what i scare ...
but it's seems fun and lovely.
maybe i use TDD for my next project just risking :D

@n1arash tests are a pain in the ass. So easy to comment out when you refactor and break your test.

But, your code will be less testable if you don't write tests continuously and you end up with too much code to cover that you don't care anymore.

Naming things is not the hardest in programming. Maintaining tests is.