Book description
This book will teach the concepts of test driven development in Java so you can build clean, maintainable and robust code
About This Book
- Explore the most popular TDD tools and frameworks and become more proficient in building applications
- Create applications with better code design, fewer bugs, and higher test coverage, enabling you to get them to market quickly
- Implement test-driven programming methods into your development workflows
Who This Book Is For
If you're an experienced Java developer and want to implement more effective methods of programming systems and applications, then this book is for you.
What You Will Learn
- Explore the tools and frameworks required for effective TDD development
- Perform the Red-Green-Refactor process efficiently, the pillar around which all other TDD procedures are based
- Master effective unit testing in isolation from the rest of your code
- Design simple and easily maintainable code by implementing different techniques
- Use mocking frameworks and techniques to easily write and quickly execute tests
- Develop an application to implement behavior-driven development in conjunction with unit testing
- Enable and disable features using feature toggles
In Detail
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.
Style and approach
An easy-to-follow, hands-on guide to building applications through effective coding practices. This book covers practical examples by introducing different problems, each one designed as a learning exercise to help you understand each aspect of TDD.
Table of contents
- Title Page
- Copyright and Credits
- Packt Upsell
- Contributors
- Preface
- Why Should I Care for Test-Driven Development?
- Tools, Frameworks, and Environments
-
Red-Green-Refactor – From Failure Through Success until Perfection
- Setting up the environment with Gradle and JUnit
- The Red-Green-Refactor process
- Tic-Tac-Toe game requirements
-
Developing Tic-Tac-Toe
- Requirement 1 – placing pieces
- Requirement 2 – adding two-player support
-
Requirement 3 – adding winning conditions
- Test – by default there's no winner
- Implementation
- Test – winning condition I
- Implementation
- Refactoring
- Test – winning condition II
- Implementation
- Test – winning condition III
- Implementation
- Test – winning condition IV
- Implementation
- Refactoring
- Requirement 4 – tie conditions
- Code coverage
- More exercises
- Summary
-
Unit Testing – Focusing on What You Do and Not on What Has Been Done
- Unit testing
- Unit testing with TDD
-
TestNG
- The @Test annotation
- The @BeforeSuite, @BeforeTest, @BeforeGroups, @AfterGroups, @AfterTest, and @AfterSuite annotations
- The @BeforeClass and @AfterClass annotations
- The @BeforeMethod and @AfterMethod annotations
- The @Test(enable = false) annotation argument
- The @Test(expectedExceptions = SomeClass.class) annotation argument
- TestNG versus JUnit summary
- Remote-controlled ship requirements
- Developing the remote-controlled ship
- Requirement – detecting obstacles
- Summary
-
Design – If It's Not Testable, It's Not Designed Well
- Why should we care about design?
- Connect 4
-
Test-last implementation of Connect 4
- Requirement 1 – the game's board
- Requirement 2 – introducing discs
- Requirement 3 – player shifts
- Requirement 4 – the game's output
- Requirement 5 – win conditions (I)
- Requirement 6 – win condition (II)
- Requirement 7 – win condition (III)
- Requirement 8 – win condition (IV)
-
The TDD or test-first implementation
- Hamcrest
- Requirement 1 – the game's board
- Requirement 2 – introducing discs
- Requirement 3 – player shifts
- Requirement 4 – the game's output
- Requirement 5 – win condition (I)
- Requirement 6 – win condition (II)
- Requirement 7 – win condition (III)
- Requirement 8 – win condition (IV)
- Final considerations
- Summary
-
Mocking – Removing External Dependencies
- Mocking
- Mockito
- Tic-Tac-Toe v2 requirements
-
Developing Tic-Tac-Toe v2
-
Requirement 1 – store moves
- Specification – DB name
- Implementation
- Specification – a name for the Mongo collection
- Implementation
- Refactoring
- Specification – adding items to the Mongo collection
- Implementation
- Specification – adding operation feedback
- Implementation
- Refactoring
- Specification – error handling
- Implementation
- Specification – clear state between games
- Implementation
- Specification – drop operation feedback
- Implementation
- Specification – error handling
- Implementation
- Requirement 2 – store every turn
-
Requirement 1 – store moves
- Integration tests
- Summary
- 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
- Other Books You May Enjoy
Product information
- Title: Test-Driven Java Development - Second Edition
- Author(s):
- Release date: March 2018
- Publisher(s): Packt Publishing
- ISBN: 9781788836111
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