NetworkError at XMLHttpRequest.send about examples HOT 2 CLOSED

@josuevalrob, are you using jsdom as Jest environment?

Since newer versions of Jest, its default environment is node now. You need to explicitly install and use jest-environment-jsdom to run browser-like code:

npm i jest-environment-jsdom -D

// your.test.js
/**
 * @jest-environment jsdom
 */

Then XMLHttpRequest will be globally defined by the environment.

The error right now happens not because of third-party libraries but because your testing environment doesn't know what XMLHttpRequest is.

I can also see some interesting jest.config.js setup that I've never seen before. I don't think you can use async functions to create Jest config. It must be a plain object.

from examples.

This should be fixed with the new examples. Please give them a try!

from examples.