Creating a global variable for chai.expect

setup.js

const chai = require('chai');
const sinonChai = require('sinon-chai');
const chaiAsPromised = require('chai-as-promised');
const chaiEnzyme = require('chai-enzyme');

chai.use(sinonChai);
chai.use(chaiAsPromised);
chai.use(chaiEnzyme());

global.chaiExpect = chai.expect;