The testing pyramid is one of the most famous concepts in agile. But how relevant is it for developers today? Mike Cohn first proposed a concept he called the “test automation pyramid” in 2004 before formalizing it in his 2009 book Succeeding With Agile. It sets out a three-stage process, with broad, basic unit tests at the bottom covering individual code functions or components, which are fast, cheap, and easily automated. In the traditional model, the next stage involves integration testing to...