https://github.com/kentcdodds/js-mocking-fundamentals

JavaScript Mocking Fundamentals on TestingJavaScript.com
https://github.com/kentcdodds/js-mocking-fundamentals

kcd-edu mocking testing testingjavascript

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JavaScript Mocking Fundamentals on TestingJavaScript.com

• Host: GitHub
• URL: https://github.com/kentcdodds/js-mocking-fundamentals
• Owner: kentcdodds
• License: other
• Created: 2018-06-20T03:23:36.000Z (over 6 years ago)
• Default Branch: main
• Last Pushed: 2024-02-01T15:49:05.000Z (12 months ago)
• Last Synced: 2024-10-19T18:25:30.189Z (3 months ago)
• Topics: kcd-edu, mocking, testing, testingjavascript
• Language: JavaScript
• Homepage: https://testingjavascript.com/courses/javascript-mocking-fundamentals
• Size: 172 KB
• Stars: 306
• Watchers: 12
• Forks: 286
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE.md
  • Code of conduct: CODE_OF_CONDUCT.md

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README

        


  JavaScript Mocking Fundamentals





  
TestingJavaScript.com

  

    

  







  Learn how mocking in JavaScript tests works by implementing them from scratch!





In this material, we have a set of `no-framework` tests that correspond to a set

of jest tests (in the `__tests__` directory). The idea is that (with the

exception of the first test), you look at the jest version first, then see how

that would be implemented without a testing framework.

Order of material:

1.  `monkey-patching.js` (no jest version)

2.  `mock-fn.js`

3.  `spy.js`

4.  `inline-module-mock.js`

5.  `external-mock-module.js`

The files are intended to test the `thumb-war.js` module and mock the `utils`

module.

To run the tests, run `npx jest`. To start watch mode run `npx jest --watch`

## Custom jest runner.

You can definitely run the `no-framework` files just using `node` (like this:

`node src/no-framework/monkey-patching.js`), but in an effort to make running

these easier, I created a custom jest runner that uses jest to run the files,

but allow them to be run without the jest testing framework. It's really cool.

It uses [`create-jest-runner`](https://www.npmjs.com/package/create-jest-runner)

and should probably be published eventually.