We did not use code coverage tools throughout this exercise. The reason is that we wanted you to be focused on the Red-Green-Refactor model. You wrote a test, saw it fail, wrote the implementation code, saw that all the tests were executed successfully, refactored the code whenever you saw an opportunity to make it better, and then you repeated the process. Did our tests cover all cases? That's something that code coverage tools such as JaCoCo can answer. Should you use those tools? Probably, only in the beginning. Let me clarify that. When you are starting with TDD, you will probably miss some tests or implement more than what the tests defined. In those cases, using code coverage is a good way to learn from your own mistakes. Later on, the more experienced you become with TDD, the less of a need you'll have for such tools. You'll write tests and...
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Test-Driven Java Development, Second Edition
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Test-Driven Java Development, Second Edition
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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 (14 chapters)
Preface
Free Chapter
Why Should I Care for Test-Driven Development?
Tools, Frameworks, and Environments
Red-Green-Refactor – From Failure Through Success until Perfection
Unit Testing – Focusing on What You Do and Not on What Has Been Done
Design – If It's Not Testable, It's Not Designed Well
Mocking – Removing External Dependencies
TDD and Functional Programming – A Perfect Match
BDD – Working Together with the Whole Team
Refactoring Legacy Code – Making It Young Again
Feature Toggles – Deploying Partially Done Features to Production
Putting It All Together
Leverage TDD by Implementing Continuous Delivery
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