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//  Conclusion:
//  Each synchronous call blocks Node's event loop. All concurrent tasks are blocked, and the event loop sits idle, until the call completes.
//  Another important note, async/await runs at 79% of the speed of bare callbacks.

//  Full documentation: https://github.com/yortus/asyncawait

import { describe, it } from 'mocha';
import { expect } from 'chai';

describe('async/await', ()=> {

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  // Promise is triggered by `()`, not `.then()`
  
  describe('promise trigger', () => {
    it('flat promise is triggered by `()` even without .then', done => {
      let result = []
      result.push(1)
      function aFlatPromise(val) {
        return new Promise(resolve => {
          result.push(val)
          resolve(val)

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  it('generator function works', () => {
    function* anotherGenerator(i) {
      yield i + 1
      yield i + 2
      yield i + 3
    }

    function* generator(i){
      yield i
      yield* anotherGenerator(i)

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describe('neither sinon faker server respond nor ajax delays', () => {
  let server
  beforeEach('set up fake server', () => {
    server = sinon.fakeServer.create()
    server.respondWith("GET", 'hey/you', [200, { 'Content-Type': 'application/json' }, JSON.stringify({})])
  })
  afterEach(() => server.restore())

  context('when ajax is called', () => {
    let result

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import proxyquire from 'proxyquire'
import originalWebsocket from 'faye-websocket'
import FirebaseServer from 'firebase-server'

const localhostWS = {
  'faye-websocket': {
    '@global': true,
    Client: url => {
      const localhostUrl = url.replace(/dummy\d+\.firebaseio\.test/i, 'localhost')
      return new originalWebsocket.Client(localhostUrl)

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import { expect } from 'chai'
import { setupDatabase, destroyDatabase } from './firebase-faker'

describe('Firebase fake server', () => {
  let server, data, client
  beforeEach(() => {
    const port = 45001
    data = {
      states: {
        CA: 'California',

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  describe.only('middleware 101', () => {
    let store, stateHistory, dispatched
    beforeEach(()=>{
      const defaultState = { text: 'initial state' }

      function reducer(state = defaultState, action) {
        switch (action.type) {
          case 'SIDE_EFFECT_USER_FETCH':
            return { text: 'THIS HAS FAILED TO BE ESCAPED!!!!'}
          case 'say':

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// coordinator => saga => action => reducer => coordinator => ... 

describe.only('Unidirectional back-end architechure', () => {
    let store, stateHistory, dispatched
    beforeEach(()=>{
      const defaultState = { text: 'initial state' }

      function reducer(state = defaultState, action) {
        switch (action.type) {
          case 'UPDATE_NUMBER':

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// @ package.json
{
  "scripts": {
    "jest": "NODE_ENV=test DB_USER=ivan-wang ./node_modules/jest/bin/jest.js",
    "jest-watch": "NODE_ENV=test DB_USER=ivan-wang ./node_modules/jest/bin/jest.js --watch --onlyChanged"
  },
  "jest": {
    "testEnvironment": "node",
    "automock": true,
    "rootDir": "",

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Babel setup with Jest test

@ package.json

"devDependencies": {
    "babel-cli": "^6.16.0",                        // for production build
    "babel-jest": "^16.0.0",                       // for Jest test with ES6
    "babel-plugin-transform-runtime": "^6.15.0",   // for Babel Register. Because babel only handle syntax translation, but not provide                                                    // missing APIs from old javascript like `Array.includes`.
                                                   // `Promise`, `Set`, `Map`, or instance methods like `String.repeat` or