" Automated testing helps developers discover their mistakes quickly (usually within minutes), which enables faster fixes as well as genuine learning-learning that is impossible when mistakes are discovered six months later during integration testing, when memories and the link between cause and effect have long faded. Instead of accruing technical debt, problems are fixed as they are found, mobilizing the entire organization if needed, because global goals outweigh local goals. "

― Gene Kim , The DevOps Handbook: How to Create World-Class Agility, Reliability, and Security in Technology Organizations