@rocketsofawesome/mirage/src/setupTests.js

import React from 'react'
import * as enzyme from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'
import 'jest-enzyme'

const localStorageMock = {
  getItem: jest.fn(),
  setItem: jest.fn(),
  clear: jest.fn(),
}

global.localStorage = localStorageMock;

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