In this chapter, we've covered many aspects that are directly connected with testing, but are not strictly necessary to start testing, although they are fundamental if you want to understand why you've taken up this book and if it's necessary to go through the rest of it.

You've seen why it's important to test, some project management methodologies, how to estimate tasks and what it entails, and you've seen different testing approaches such as TDD and BDD, which will be the basis for many of the remaining chapters. At the end, I've tried to give an idea of what it takes to gain the testing mindset required to become a master in this art.

In Chapter 2, Tooling up for Testing, we will start gearing up with the tools we are going to use throughout the rest of this book, understanding the basics of Yii 2 and applying what we've learned in this chapter by outlining our test plan.