Pragmatic Unit Testing in Java with JUnit, 3rd Edition

Summary

It’s easy to write a lot of code quickly. It’s just as easy to let that code get dirty to the point where it becomes difficult to comprehend and navigate. Unit tests provide the safeguards you need to clean up messy code without breaking things.

In this chapter, you learned techniques for keeping your system clean continually to help you keep your system from degrading into a frustrating mess. You renamed variables and methods, you extracted smaller methods, you in-lined variables, and you replaced older Java constructs with newer ones. You might call this very incremental method-level cleanup “micro” refactoring—a programmer’s version of the continuous editing that a writer performs.

Don’t let your code get to the point of the convoluted ...