theKashey

import {theDay} from 'doom-scheduler'
import {Launch} from './rocket-silo';

theDay
  .then(Launch)
  .then( () => alert(' :) '),
         () => alert(' :( next time, you know...'); 

theKashey

export const theDay = Promise.resolve();

theKashey

import {Launch} from './rocket-silo';
import {theDay} from 'doom-scheduler'
import 'rocket-silo';

jest.mock('./rocket-silo'); // mocking something we already imported!!!
jest.mock('doom-scheduler');

theDay.mockResolvedValue("comming!");

expect(Launch).toHaveBeenCalled();

theKashey

import mockery from 'mockery';
import sinon from 'sinon';
//import {Launch} from './rocket-silo'; // you cannot use imports
//import {theDay} from 'doom-scheduler'

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

mockery.registerMock('doom-scheduler', {

theKashey

import proxyquire from 'proxyquire';
import sinon from 'sinon';

const  Launch= sinon.stub()

const case = proxyquire.load('./dooms-day.js',{  
 './rocket-silo', { Launch },
 'doom-scheduler', { theDay: Promise.resolve()
});

theKashey

import td from 'testdouble';

const {Launch} = td.replace('./rocket-silo'); // automock
const scheduler = td.replace('doom-scheduler', { theDay: Promise.resolve() })

require('./dooms-day.js');

td.verify(Launch());

theKashey

import rewiremock from 'rewiremock';
import {Launch} from './rocket-silo';
import {theDay} from 'doom-scheduler'
import 'rocket-silo';

// prev jest.mock('doom-scheduler');
rewiremock('./rocket-silo').mockThrough();
rewiremock('doom-scheduler').mockThrough();

theDay.resolves("comming!"); // sinon

theKashey

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

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

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

theKashey

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

const  Launch = sinon.stub()

// const case = proxyquire.load('./dooms-day.js',{  
const case = rewiremock.proxy('./dooms-day.js',{  
 './rocket-silo': { Launch },
 'doom-scheduler': { theDay: Promise.resolve()}
});

theKashey

import rewiremock from 'rewiremock';

const {Launch} = rewiremock('./rocket-silo').mockThrough(); // automock
const scheduler = rewiremock('doom-scheduler').with({ theDay: Promise.resolve() })

rewiremock.proxy('./dooms-day.js');

expect(Launch).toHaveBeenCalled();