The SRP and Profile class

Writing unit tests isn’t an exercise that occurs in a vacuum. It’s instead part of the larger, continually shifting puzzle we call design. Our system’s design impacts our ability to write tests and vice versa.

We’ll also investigate command-query separation, which uses methods that don’t end up fooling their users by both creating side effects and returning values.

We’ll apply these principles by refactoring code in the Profile class.

Let’s take a look at our Profile class so far: