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Svelte with Test-Driven Development

You're reading from   Svelte with Test-Driven Development Advance your skills and write effective automated tests with Vitest, Playwright, and Cucumber.js

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Product type Paperback
Published in Jun 2023
Publisher Packt
ISBN-13 9781837638338
Length 250 pages
Edition 1st Edition
Languages
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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 (22) Chapters Close

Preface 1. Part 1: Learning the TDD Cycle
2. Chapter 1: Setting up for Testing FREE CHAPTER 3. Chapter 2: Introducing the Red-Green-Refactor Workflow 4. Chapter 3: Loading Data into a Route 5. Chapter 4: Saving Form Data 6. Chapter 5: Validating Form Data 7. Chapter 6: Editing Form Data 8. Part 2: Refactoring Tests and Application Code
9. Chapter 7: Tidying up Test Suites 10. Chapter 8: Creating Matchers to Simplify Tests 11. Chapter 9: Extracting Logic Out of the Framework 12. Chapter 10: Test-Driving API Endpoints 13. Chapter 11: Replacing Behavior with a Side-By-Side Implementation 14. Chapter 12: Using Component Mocks to Clarify Tests 15. Chapter 13: Adding Cucumber Tests 16. Part 3: Testing SvelteKit Features
17. Chapter 14: Testing Authentication 18. Chapter 15: Test-Driving Svelte Stores 19. Chapter 16: Test-Driving Service Workers 20. Index 21. Other Books You May Enjoy

Adding an API endpoint for updating data

The final piece of the puzzle is to add a PUT request handler function for dealing with updates. Similar to the POST function, we must provide the request body using the createRequest helper.

The form of our PUT request means that id is passed as a parameter in the URL, like this:

Here’s a reminder of how the URL must be passed:

PUT http://localhost:1234/api/birthday/abc123

To make SvelteKit register the abc123 value as a parameter, we need to create a new route directory at src/routes/api/birthday/[id]. SvelteKit will then know that abc123 matches the [id] bit of the directory path. The directory itself will then contain the +server.js file and its tests.

Let’s start with the tests:

  1. Create a new file named src/routes/api/birthday/[id]/server.test.js and add the following imports. This has everything we’ve used previously for the GET and POST functions, together with an import for the PUT function...
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