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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

Summary

In this chapter, we learned how to apply the SOLID principles to decouple external systems completely, leading to an application architecture known as the hexagonal architecture. We saw how this allows us to use test doubles in place of external systems, making our tests simpler to write, with repeatable results. This, in turn, allows us to test entire user stories with a FIRST unit test. As a bonus, we isolate ourselves from future changes in those external systems, limiting the amount of rework that would be required to support new technologies. We’ve seen how the hexagonal architecture combined with dependency injection allows us to support several different external systems choices and select the one we want at runtime via configuration.

The next chapter will look at the different styles of automated testing that apply to the different sections of a hexagonal architecture application. This approach is summarized as the Test Pyramid, and we shall learn more about...

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