Rewiremock mockery

dooms-day.test.js

import rewiremock from 'rewiremock';
import sinon from 'sinon';

// mockery.registerMock('./rocket-silo', {
//  Launch: sinon.stub()
// });

rewiremock('./rocket-silo').with({
  Launch: sinon.stub()
});

rewiremock('doom-scheduler').with({
 theDay: Promise.resolve()
});

rewiremock.enable();
require('./dooms-day.js');
rewiremock.disable();

expect(Launch).toHaveBeenCalled();