setupTests.js

import React from 'react';
import Enzyme, { shallow, render, mount } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';
import { createSerializer } from 'enzyme-to-json';
import sinon from 'sinon';

expect.addSnapshotSerializer(createSerializer({mode: "deep"}));

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

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