The previous example used our custom mock objects. When you're working with a lot of interfaces, writing these can become cumbersome and error-prone. This is a place where generating code makes a lot of sense. Fortunately, there's a package called github.com/golang/mock/gomock that provides a generation of mock objects and gives us a very useful library to use in conjunction with interface testing.

This recipe will explore some of the functionality of gomock and will cover trade-offs on where, when, and how to work with and generate mock objects.