In this Tech Talk Alberto Savoia, CTO of Agitar Software explains how his early experiences with agile development at Google turned him into an evangelist for unit and developer testing, but also made him realize that, without some automation, most developer testing initiatives are bound to fail. View this Tech talk to learn how unit testing improves agile development and how automation helps all types of developers succeed at testing better and faster. Savoia discusses in this Tech Talk that when it comes to unit testing their own code, developers fall into one of three categories: a minority of developers are easily convinced and become "test-infected" almost immediately; most developers require more convincing but eventually become test-infected (at least temporarily); and a significant number seem to be immune to test infection and resist the very idea of testing.