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Test-Driven Development with Java

You're reading from   Test-Driven Development with Java Create higher-quality software by writing tests first with SOLID and hexagonal architecture

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Product type Paperback
Published in Jan 2023
Publisher Packt
ISBN-13 9781803236230
Length 348 pages
Edition 1st Edition
Languages
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Author (1):
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Alan Mellor Alan Mellor
Author Profile Icon Alan Mellor
Alan Mellor
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Table of Contents (21) Chapters Close

Preface 1. Part 1: How We Got to TDD
2. Chapter 1: Building the Case for TDD FREE CHAPTER 3. Chapter 2: Using TDD to Create Good Code 4. Chapter 3: Dispelling Common Myths about TDD 5. Part 2: TDD Techniques
6. Chapter 4: Building an Application Using TDD 7. Chapter 5: Writing Our First Test 8. Chapter 6: Following the Rhythms of TDD 9. Chapter 7: Driving Design – TDD and SOLID 10. Chapter 8: Test Doubles – Stubs and Mocks 11. Chapter 9: Hexagonal Architecture –Decoupling External Systems 12. Chapter 10: FIRST Tests and the Test Pyramid 13. Chapter 11: Exploring TDD with Quality Assurance 14. Chapter 12: Test First, Test Later, Test Never 15. Part 3: Real-World TDD
16. Chapter 13: Driving the Domain Layer 17. Chapter 14: Driving the Database Layer 18. Chapter 15: Driving the Web Layer 19. Index 20. Other Books You May Enjoy

Test Doubles – Stubs and Mocks

In this chapter, we’re going to solve a common testing challenge. How do you test an object that depends on another object? What do we do if that collaborator is difficult to set up with test data? Several techniques are available to help us with this and they build on the SOLID principles we learned previously. We can use the idea of dependency injection to enable us to replace collaborating objects with ones specially written to help us write our test.

These new objects are called test doubles, and we will learn about two important kinds of test double in this chapter. We will learn when to apply each kind of test double and then learn two ways of creating them in Java – both by writing the code ourselves and by using the popular library Mockito. By the end of the chapter, we will have techniques that allow us to write tests for objects where it is difficult or impossible to test them with the real collaborating objects in place...

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