Thank you for taking the time to read and respond to my article Igor! Unfortunately I don't have a definitive answer, I've always written unit tests on a case-by-case basis. Each project I've worked on is different, and have required different levels of testing. Generally as a courtesy if I'm not the last person working with my code, I'll write a unit test. However sometimes, I'll skip the unit test altogether if it's going to be redundant.