This part of the book will get you up to speed with the current state of unit testing. In chapter 1, I’ll define the goal of unit testing and give an overview of how to differentiate a good test from a bad one. We’ll talk about coverage metrics and discuss properties of a good unit test in general.
In chapter 2, we’ll look at the definition of unit test. A seemingly minor disagreement over this definition has led to the formation of two schools of unit testing, which we’ll also dive into. Chapter 3 provides a refresher on some basic topics, such as structuring of unit tests, reusing test fixtures, and test parametrization.