How to use the mock-require.reRequire function in mock-require

beforeEach(() => {
    // Mock out the "require" calls in the module under test
    fsMock = { readFileSync: simpleMock.stub() };
    mockRequire('fs', fsMock);

    vmMock = { runInThisContext: simpleMock.stub() };
    mockRequire('vm', vmMock);

    testEnvironmentMaker = mockRequire.reRequire('./test-environment-maker');
  });

beforeEach(function() {
    // Mock out the "require" calls in the module under test
    fsMock = { readFileSync: simpleMock.stub() };
    mockRequire('fs', fsMock);
    fileFragmentLoader = mockRequire.reRequire('./file-fragment-loader.js');
  });

it('should expose a getWebpackConfig method', () => {
    const lib = mock.reRequire(configPath);
    expect(typeof lib.getWebpackConfig).toEqual('function');
  });

it('should return a config object', () => {
    const lib = mock.reRequire(configPath);
    const config = lib.getWebpackConfig(skyPagesConfig);
    expect(config).toEqual(jasmine.any(Object));
  });

it('should expose a runCommand method', () => {
    const lib = mock.reRequire('../index');
    expect(typeof lib.runCommand).toEqual('function');
  });

it('requires common config file', () => {
        //setup
        process.env.NODE_ENV = 'dev';

        //exercise
        config = Mock.reRequire('config');

        //verify
        expect(config).to.be.an.object();
        expect(config.common).to.be.a.boolean();
        expect(config.common).to.equals(true);
    });

beforeEach(()=>{
      fakeHighcharts = {};
        console.log(modulename);
      mock(modulename, fakeHighcharts);
      Component = mock.reRequire('../../' + libPath);
    });

before(() => {
        Config = require('config');
        mailConfig = Config.mail;
        smtpConfig = Config.smtp;

        Mock('plugins/logger', Logger);
        Mailer = Mock.reRequire('plugins/mailer');
    });

beforeEach(() => {
    mock('../config/sky-pages/sky-pages.config', {
      spaPath: (...segments) => segments.join('/'),
      spaPathTempSrc: () => '',
      spaPathTemp: () => ''
    });
    util = mock.reRequire('../cli/utils/prepare-library-package');
  });

beforeEach(() => {
    lib = mock.reRequire('../config/protractor/protractor.conf.js');
    config = lib.config;
  });