Jest test fails with window is not defined

webpack jestjs yarnpkg
Gunnar Eketrapp picture Gunnar Eketrapp · Sep 18, 2017 · Viewed 29.5k times · Source

I am trying to get started with state of the art web development learning React/Redux.

Right now I am stuck at getting tests running. For some reason jest fails with 

Task :frontend:test 
yarn jest v1.0.2
$ "/Users/gunnar/git/app.oakstair.se/frontend/node_modules/.bin/jest" 
FAIL src/containers/App/App.test.js
  ● Test suite failed to run

 ReferenceError: window is not defined

  at Object.<anonymous> (config/polyfills.js:18:1)
  at next (native)
  at process._tickCallback (internal/process/next_tick.js:109:7)

I have googled for a while without any success ...

This is my starting test.js

And this my App test code

Answer

JacksonHaenchen picture JacksonHaenchen · May 16, 2018

I had the same issue and I do not believe modifying globals is the way to do it. The issue was because in my jest config I had testEnvironment set to node when it should've been jsdom. For me this setting was located in package.json as defined by the react starter app.

Related questions

How to use jest with webpack?

I use webpack to develop a React component. Here is a simple version of it: 'use strict'; require('./MyComponent.less'); var React = require('react'); var MyComponent = React.createClass({ render() { return ( <div className="my-component"> Hello World </div&…

Read More
Testing with Jest and Webpack aliases

I am looking to be able to use webpack aliases to resolve imports when using jest, and optimally, reference the webpack.aliases to avoid duplication. Jest conf: "jest": { "modulePaths": ["src"], "moduleDirectories": ["node_modules"], "moduleNameMapper": { "^@shared$": "<rootDir>/shared/", "^@components$": "&…

Read More
How can I mock Webpack's require.context in Jest?

Suppose I have the following module: var modulesReq = require.context('.', false, /\.js$/); modulesReq.keys().forEach(function(module) { modulesReq(module); }); Jest complains because it doesn't know about require.context: FAIL /foo/bar.spec.js (0s) ● Runtime Error - TypeError: …

Read More