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Mastering React Test-Driven Development

You're reading from   Mastering React Test-Driven Development Build rock-solid, well-tested web apps with React, Redux and GraphQL

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Product type Paperback
Published in May 2019
Publisher Packt
ISBN-13 9781789133417
Length 496 pages
Edition 1st 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 (21) Chapters Close

Preface 1. Section 1: First Principles of TDD FREE CHAPTER
2. First Steps with Test-Driven Development 3. Test-driving Data Input with React 4. Exploring Test Doubles 5. Creating a User Interface 6. Section 2: Building a Single-Page Application
7. Humanizing Forms 8. Filtering and Searching Data 9. Test-driving React Router 10. Test-driving Redux 11. Test-driving GraphQL 12. Section 3: Interactivity
13. Building a Logo Interpreter 14. Adding Animation 15. Working with WebSockets 16. Section 4: Acceptance Testing with BDD
17. Writing Your First Acceptance Test 18. Adding Features Guided by Acceptance Tests 19. Understanding TDD in the Wider Testing Landscape 20. Other Books You May Enjoy

Designing a WebSocket interaction

Before we begin test-driving, let's think about the up-front design.

There are two modes of operation: presenting and watching. If you're presenting, then everyone watching will get a copy of your commands. A session is made up of one presenter and zero or more watchers. WebSockets are used to communicate with the server. Messages are sent in JSON format.

The new teaching mode, with sharing information at the top of the screen

So, how does it work?

  • The presenter clicks the Start sharing button. The server is sent the following message.
{ type: 'START_SHARING' }
  • The server then responds with the id of the session, as shown:
{ status: 'STARTED', id: 123 }
  • This ID can be used to create a URL that opens the application in watching mode, linked to this ID:
http://localhost:3000/index.html?watching=123
  • The URL can...
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