Summary

In this chapter, we expanded on unit testing essentials by learning how to handle code dependencies. We began by introducing DI and exploring different approaches to how this is done in Go. You learned how to use mocks to have fine-grained control over the preconditions that your test runs in, as well as how to generate them using the testify/mock framework. Then, we explored different assertion frameworks and how to use them to streamline our tests. Finally, we discussed the SOLID principles, which will help us to write testable code.

In Chapter 4, Building Efficient Test Suites, we will begin to look at our tests as a collection, ensuring they complement each other and cover edge cases. We will also explore the popular Go technique of table-driven testing.