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Mastering React Test-Driven Development

You're reading from   Mastering React Test-Driven Development Build simple and maintainable web apps with React, Redux, and GraphQL

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Product type Paperback
Published in Sep 2022
Publisher Packt
ISBN-13 9781803247120
Length 564 pages
Edition 2nd Edition
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Author (1):
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Daniel Irvine Daniel Irvine
Author Profile Icon Daniel Irvine
Daniel Irvine
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Table of Contents (26) Chapters Close

Preface 1. Part 1 – Exploring the TDD Workflow
2. Chapter 1: First Steps with Test-Driven Development FREE CHAPTER 3. Chapter 2: Rendering Lists and Detail Views 4. Chapter 3: Refactoring the Test Suite 5. Chapter 4: Test-Driving Data Input 6. Chapter 5: Adding Complex Form Interactions 7. Chapter 6: Exploring Test Doubles 8. Chapter 7: Testing useEffect and Mocking Components 9. Chapter 8: Building an Application Component 10. Part 2 – Building Application Features
11. Chapter 9: Form Validation 12. Chapter 10: Filtering and Searching Data 13. Chapter 11: Test-Driving React Router 14. Chapter 12: Test-Driving Redux 15. Chapter 13: Test-Driving GraphQL 16. Part 3 – Interactivity
17. Chapter 14: Building a Logo Interpreter 18. Chapter 15: Adding Animation 19. Chapter 16: Working with WebSockets 20. Part 4 – Behavior-Driven Development with Cucumber
21. Chapter 17: Writing Your First Cucumber Test 22. Chapter 18: Adding Features Guided by Cucumber Tests 23. Chapter 19: Understanding TDD in the Wider Testing Landscape 24. Index 25. Other Books You May Enjoy

Stubbing fetch responses

As with many HTTP requests, our POST /customers endpoint returns data: it will return the customer object together with a newly generated identifier that the backend has chosen for us. Our application will make use of this by taking the new ID and sending it back to the parent component (although we won’t build this parent component until Chapter 8, Building an Application Component).

To do that, we’ll create a new CustomerForm prop, onSave, which will be called with the result of the fetch call.

But hold on—didn’t we just remove an onSubmit prop? Yes, but this isn’t the same thing. The original onSubmit prop received the form values submitted by the user. This onSave prop is going to receive the customer object from the server after a successful save.

To write tests for this new onSave prop, we’ll need to provide a stub value for global.fetch, which essentially says, “This is the return value of calling...

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