Book Image

Test-Driven Java Development, Second Edition - Second Edition

By : Viktor Farcic, Alex Garcia
Book Image

Test-Driven Java Development, Second Edition - Second Edition

By: Viktor Farcic, Alex Garcia

Overview of this book

Test-driven development (TDD) is a development approach that relies on a test-first procedure that emphasizes writing a test before writing the necessary code, and then refactoring the code to optimize it.The value of performing TDD with Java, one of the longest established programming languages, is to improve the productivity of programmers and the maintainability and performance of code, and develop a deeper understanding of the language and how to employ it effectively. Starting with the basics of TDD and understanding why its adoption is beneficial, this book will take you from the first steps of TDD with Java until you are confident enough to embrace the practice in your day-to-day routine.You'll be guided through setting up tools, frameworks, and the environment you need, and we will dive right into hands-on exercises with the goal of mastering one practice, tool, or framework at a time. You'll learn about the Red-Green-Refactor procedure, how to write unit tests, and how to use them as executable documentation.With this book, you'll also discover how to design simple and easily maintainable code, work with mocks, utilize behavior-driven development, refactor old legacy code, and release a half-finished feature to production with feature toggles.You will finish this book with a deep understanding of the test-driven development methodology and the confidence to apply it to application programming with Java.
Table of Contents (18 chapters)
Title Page
Packt Upsell
Contributors
Preface
9
Refactoring Legacy Code – Making It Young Again
Index

Chapter 10. Feature Toggles – Deploying Partially Done Features to Production

"Do not let circumstances control you. You change your circumstances."

– Jackie Chan

We have seen so far how TDD makes the development process easier and decreases the amount of time spent on writing quality code. But there's another particular benefit to this. As code is being tested and its correctness is proven, we can go a step further and assume that our code is production-ready once all tests have passed.

There are some software life cycle approaches based on this idea. Some extreme programming (XP) practices such as continuous integration (CI), continuous delivery, and continuous deployment (CD) will be introduced. The code examples can be found at https://bitbucket.org/alexgarcia/packt-tdd-java/src/, in the folder 10-feature-toggles.

The following topics will be covered in this chapter:

  • Continuous integration, delivery, and deployment
  • Testing the application in production
  • Feature Toggles