JavaScript Configuring Enzyme 3.x Adapter configure enzyme adapter,configure enzyme adapter jest,enzyme.configure( adapter

It doesn't need a particular name, and yes, it's run before any tests are.

You hook it up in your package.json's jest stanza.

This is an example from a project I'm working on.

  "jest": {
    // other stuff...
    "setupFiles": [
      "./js/jest-setup.js"
    ],
    // ....
   }

The actual js/jest-setup.js file looks like this (i.e. like your example).

import Enzyme from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

Enzyme.configure({adapter: new Adapter()});

Answer:1

Enzyme has a nifty guide on setup here: https://github.com/airbnb/enzyme/blob/master/docs/guides/jest.md

Though the initial step doesn't say it is the package.json.

Posting the relevant sections (with some minor tweaks) here so we don't lose it:

Configure with Jest

To run the setup file to configure Enzyme and the Adapter with Jest direct setupTestFrameworkScriptFile to literally the string <rootDir> and the path to your setup file.

package.json:

{
  "jest": {
    "setupTestFrameworkScriptFile": "<rootDir>src/setupTests.js"
  }
}

Jest version 15 and up

Starting with version 15, Jest no longer mocks modules by default. Because of this, you no longer have to add any special configuration for Jest to use it with enzyme.

Install Jest, and its Babel integrations, as recommended in the Jest docs. Install enzyme. Then, simply require/import React, enzyme functions, and your module at the top of a test file.

setupTests.js:

import React from 'react';
import { shallow, mount, render } from 'enzyme';

import Foo from '../Foo';

Answer:2

Jest & enzyme configuration : Add following code in package.json

"jest": {
    "testEnvironment": "jsdom",
    "moduleDirectories": [
      "src",
      "node_modules"
    ],
    "moduleNameMapper": {
      "\\.(css|scss)$": "<rootDir>/__mocks__/styleMock.js",
      "\\.(jpg|gif|ttf|eot|svg)$": "<rootDir>/__mocks__/fileMock.js"
    },
    "transform": {
      "^.+\\.(js|jsx)$": "babel-jest",
      ".+\\.(css|styl|less|sass|scss)$": "<rootDir>/node_modules/jest-css-modules-transform"
    },
    "setupTestFrameworkScriptFile": "<rootDir>/setupTests.js",
    "setupFiles": [
      "<rootDir>setup.js"
    ],
    "moduleFileExtensions": [
      "css",
      "scss",
      "js",
      "json",
      "jsx"
    ],
    "testRegex": "\/test\/spec\/.*\\.js$",
    "transformIgnorePatterns": [
      "/node_modules/(?!test-component).+\\.js$"
    ]
  }

For setup of Enzyme => setup.js

import { configure } from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'

configure({ adapter: new Adapter() })

For setupTestFrameworkScriptFile : setupTests.js global.fetch = require('jest-fetch-mock')

const { JSDOM } = require('jsdom')
const jsdom = new JSDOM('<!doctype html><html><body></body></html>')
const { window } = jsdom

const exposedProperties = ['window', 'navigator', 'document']
const { document } = new JSDOM('').window
global.document = document
global.window = document.defaultView
global.HTMLElement = window.HTMLElement
global.HTMLAnchorElement = window.HTMLAnchorElement

Object.keys(document.defaultView).forEach(property => {
  if (typeof global[property] === 'undefined') {
    exposedProperties.push(property)
    global[property] = document.defaultView[property]
  }
})

global.navigator = {
  userAgent: 'node.js',
}

Answer:3

I was just having this same issue and the easiest solution was to simply create a file named exactly setupTests.js, in the src/ directory with the contents:

import { configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

Jest automatically detects it and the error goes away.

Answer:4

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