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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 First, Test Later, Test Never

In this chapter, we are going to review some of the nuances of Test-Driven Development (TDD). We’ve already covered the broad techniques of writing unit tests as part of an overall test strategy. We can use the test pyramid and hexagonal architecture to guide the scope of our tests in terms of what specifically they need to cover.

We have two more dimensions we need to decide on: when and where to start testing. The first question is one of timing. Should we always write our tests before the code? What difference would it make to write tests after the code? In fact, what about not testing at all – does that ever make sense? Where to start testing is another variable to decide. There are two schools of thought when it comes to TDD – testing from the inside out or the outside in. We will review what these terms mean and what impact each has on our work. Finally, we will consider how these approaches work with a hexagonal architecture...

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