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<h1 align="center"> <a href="https://testingjavascript.com/courses/javascript-mocking-fundamentals">JavaScript Mocking Fundamentals</a> </h1> <div align="center"> <h2><a href="https://testingjavascript.com">TestingJavaScript.com</a></h2> <a href="https://testingjavascript.com"> <img width="500" alt="Learn the smart, efficient way to test any JavaScript application." src="https://kentcdodds.com/images/testingjavascript-promo/tjs-4.jpg" /> </a> </div> <hr /> <p align="center" style="font-size: 1.2rem;"> Learn how mocking in JavaScript tests works by implementing them from scratch! </p> <hr />

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:

monkey-patching.js (no jest version)
mock-fn.js
spy.js
inline-module-mock.js
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 and should probably be published eventually.