If we have a unit test file my-spec.js and running with mocha:   mocha my-spec.js   The default timeout will be 2000 ms. It can be overwritten for partial test with a command line parameter:   mocha my-spec.js --timeout 5000   Is it possible to cha...

I have the following ES6 modules:  network.js  export function getDataFromServer() {   return ... }   widget.js  import { getDataFromServer } from 'network.js';  export class Widget() {   constructor() {     getDataFromServer("dataForWi...

I have a callback function in before() which is for cleaning database.  Is everything in before() guaranteed to finish before it() starts?   before(function(){    db.collection('user').remove({}, function(res){}); // is it guaranteed to fin...

describe('some test', function(){     // Could put here a shared variable     it('should pass a value', function(done){         done(null, 1);     });     it('and then double it', function(value, done){         console.log(val...

I've got a test suite that looks like the below:  (Notice the accountToPost variable at the top (below the first describe block)  describe('Register Account', function () {      var accountToPost;      beforeEach(function (done) {...

A typical test in my node.js mocha suite looks like the following:   it("; client should do something", function(done) {     var doneFn = function(args) {       // run a bunch of asserts on args       client.events.removeListener(client.event...

What specifically is the difference between Mocha's before() and beforeEach()? (Same question for after() and afterEach().)  I assume before() runs once per describe() block, and beforeEach() runs once per test (it() block). Is that true?  And wh...

I have a file named test/helper.js that I use to run Mocha tests on my Node.js apps. My tests structure looks like:  test/ test/helper.js    # global before/after test/api/sometest.spec.js test/models/somemodel.spec.js ... more here   The file helper...

I am learning to test React stateless components using the ReactTestUtils library. This is my simple component:  import React from 'react';  const Greeter = ({name,place}) => (   <h1>Hello,{name}. Welcome to the {place}.</h1> )...

I need to test JavaScript code that relies on setTimeout in order to perform periodic tasks. How can I from my Mocha tests simulate the passing of time so that setTimeout callbacks gets called?  I am basically asking for functionality similar to Jasm...