This talk takes a look at the positive impacts that automated tests can have on architecture. Unit testing in PHPUnit or PhpSpec, as well as behavioural testing using tools like Behat, have a noticeable effect on software architecture. Tested (or testable) code is often easier to work with, cleaner, and has architectural advantages. We will take a look at some of the impacts that a good test suite can have on your application’s architecture, and how to let your tests be your architect.