Jest + Enzyme

fileMock.js

// This is file is used by jest to resolve imports to asset files such as images or fonts
export default 'test-file-stub'

jestsetup.js

import 'raf/polyfill'

import Enzyme, { shallow, render, mount } from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'

// React 16 Enzyme adapter
Enzyme.configure({ adapter: new Adapter() })

// Make Enzyme functions available in all test files without importing
global.shallow = shallow
global.render = render
global.mount = mount

package.json

{
  "scripts": {
    "test": "jest",
    "test:watch": "jest --watch",
    "test:coverage": "jest --coverage"
  },
  "jest": {
    "setupFiles": [
      "./jestsetup.js"
    ],
    "snapshotSerializers": [
      "enzyme-to-json/serializer"
    ],
    "projects": [
      "<rootDir>/services/app"
    ],
    "modulePaths": [
      "<rootDir>/services/app"
    ],
    "moduleNameMapper": {
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
      "\\.(css|less)$": "identity-obj-proxy"
    },
    "coverageReporters": [
      "text",
      "text-summary"
    ]
  },
  "devDependencies": {
    "babel-jest": "^21.2.0",
    "babel-preset-env": "^1.6.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-latest": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "enzyme": "^3.2.0",
    "enzyme-adapter-react-16": "^1.1.0",
    "enzyme-to-json": "^3.2.2",
    "identity-obj-proxy": "^3.0.0",
    "jest": "^21.2.1",
    "raf": "^3.4.0",
    "react-test-renderer": "^16.2.0"
  }
}