Attempt to solve problem of stubbing require.ensure in Mocha unit tests (see https://stackoverflow.com/questions/44114737/how-do-i-stub-webpacks-require-ensure)

PageHeaderTest.js

/**
 * PageHeaderTest.js
 *
 * (C) 2017 mobile.de GmbH
 *
 * @author <a href="mailto:[email protected]">Patrick Hund</a>
 * @since 28 Mai 2017
 */
import { mount } from 'enzyme';
import React from 'react';
import PageHeader from '../../../../src/shared/components/pageHeader/PageHeader';
import { sandbox } from 'sinon';

describe('[shared/components/pageHeader/PageHeader]', () => {
    describe('When I render the component', () => {
        let mySandbox;
        const dummyFunction = () => {
            // intentionally left blank
        };
        beforeEach(() => {
            mySandbox = sandbox.create();
            require.ensure = sandbox.stub();
            mount(<PageHeader requestBoardData={dummyFunction} />);
        });

        describe('webpack code splitting', () => it('is used to load modules asynchronously', () =>
            require.ensure.should.have.been.called
        ));
        afterEach(() => {
            mySandbox.restore();
            delete require.ensure;
        });
    });
});