Tests are a good thing, right? But how much should we test? What's not enough? What's too much? What should we test, and when? In this talk, we'll look at the many levels of testing, from the outermost UI tests to unit tests, what works well, what doesn't work well. We'll look at functional testing, subcutaneous testing, integration and unit testing and where and why we would want to do each. We'll arrive at a testing strategy for the sane without retreating into dogma by looking at real-world examples of how testing strategies differ per environment and team. At the end, you feel the fulfillment of a customized, holistic testing strategy that works for you and your team.