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Unit Testing Input Event in Angular6

By : nidi
Date : August 27 2020, 06:00 AM
Hope this helps I have an Input field in the UI , Try this-
code :
it('some text', async(async() => {
      spyOn(component, 'onBLCChanged');
      // first round of change detection
      // get ahold of the input
      let input = debugElement.query(By.css('#blc'));
      let inputElement = input.nativeElement;

      //set input value
      inputElement.value = 'test';

      // save event object so that you can do comparison.
      const event = new Event('change');


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Mocking the event object in AngularJS event unit testing

By : Maxime Mulder
Date : March 29 2020, 07:55 AM
I wish this help you I have the following test: , In this line:
code :
$rs.$broadcast('$locationChangeStart', eventStub);
$rootScope.$on('$locationChangeStart', function (event) 
$rootScope.$on('$locationChangeStart', function (event, eventStub) 

Unit Testing - Raising static event to test proper event handler assignment

By : Pratama NPurwiyatna
Date : March 29 2020, 07:55 AM
I wish this helpful for you I got around this by deciding that I don't need to raise the event myself. Instead I can have a private method to raise the event and then use PrivateType to invoke that method.
code :
public class EventOrigin {
    public static event handler eventOccurred;
    public delegate void handler(string arg1, string arg2);

    #region testability seams

    private static raiseEventOccurred(string arg1, string arg2) {
        if(eventOccurred != null)
            eventOccurred(arg1, arg2);

private void whenEventRaised_someStuffHappens(){
    PrivateType eventOriginType = new PrivateType(typeof(EventOrigin));
    eventOriginType.InvokeStatic("raiseEventOccurred", "arg1", "arg2");


How to provide mock files to change event of <input type='file'> for unit testing

By : chantal
Date : March 29 2020, 07:55 AM
help you fix your problem Let's rethink AngularJS, DOM must be handled in a directive
We should not deal with DOM element in a controller, i.e. element.on('change', .., especially for testing purpose. In a controller, You talk to data, not to DOM.
code :
<input type="file" name='file' ng-change="fileChanged()" /> <br/>
<input type="file" 
  onchange="angular.element(this).scope().fileChanged(this.files)" />
$scope.fileChanged = function(files) {
  return files.0.length < 500000;
describe(‘MyCtrl’, function() {
  it('does check files', inject(
    function($rootScope, $controller) {
      scope = $rootScope.new();
      ctrl = $controller(‘UploadCtrl’, {‘$scope’: scope});

      var files = { 0: {name:'foo', size: 500001} };

Unit testing an event which is not bound by event emitter

By : Reinhard Stahn
Date : March 29 2020, 07:55 AM
hop of those help? Big disclaimer first: I don't know TypeScript, nor the internals of your application, so the following may not work out-of-the-box. However, it may provide you with some ideas on how to implement these sorts of tests.
I abstracted your client code (the code thats needs to be tested):
code :
// mqtt-module.js
const mqtt = require('mqtt');
const messageReceivedCallBack = require('./callbacks');

// This mimics what your code does. Instead of a class I just make it a
// simple function.
module.exports = {
 setup() {
    let client = mqtt.connect();
    client.on('message', (topic, message) => {
      // We want to test this.
// callbacks.js
module.exports = {
  onMessageReceived(message) {}
// test.js
const mqtt = require('mqtt');

// The modules mentioned above.
const mqttModule              = require('./mqtt-module');
const messageReceivedCallBack = require('./callbacks');

// Set up Sinon and Chai
const sinon = require('sinon');
const chai  = require('chai');
let expect  = chai.expect;

// Create a fake client for testing purposes.
const EventEmitter = require('events').EventEmitter;
class Client extends EventEmitter {}

// The test case.
describe('my test case', () => {
  var mockClient;

  beforeEach(() => {
    mockClient = new Client();
    // mqtt.connect() returns a fake client instance, with
    // just enough logic to allow events to be emitted and
    // received.
    sinon.stub(mqtt, 'connect').returns(mockClient);

    // Call the setup of our MQTT class (this will likely be
    // entirely different in your case, but the idea is that
    // it gets called _after_ `mqtt.connect()` gets stubbed.

  afterEach(() => {
    // Restore the original.

  it('should call messageReceivedCallBack.onMessageReceived', () => {
    // The message that we're going to pass.
    let message = 'this is a test message';

    // We want to stub messageReceivedCallBack.onMessageReceived()
    sinon.stub(messageReceivedCallBack, 'onMessageReceived');

    // Emit a `message` event on our mock client, which will trigger
    // the `client.on('message', ...)` in your MQTT class.
    mockClient.emit('message', 'topic', message);

    // Test if the stub was called with the proper argument.

    // Restore to the original function.


Angular2+ integration unit-testing: How to fake user typing something into input, with 'keydown'-event AND 'input'-event

By : user2255629
Date : March 29 2020, 07:55 AM
hope this fix your issue I found a solution.
Was missing the fact that the event should be cancelable (thanks to this).
code :
describe('NumberComponent', () => {
    let component: NumberComponent;
    let fixture: ComponentFixture<NumberComponent>;

    beforeEach(async(() => {
            declarations: [NumberComponent, NumberOnlyDirective],
            imports: [FormsModule]

    beforeEach(async(() => {
        fixture = TestBed.createComponent(NumberComponent);
        component = fixture.componentInstance;


    it('should prohibit non-numeric input', () => {
        let numberDebug = fixture.debugElement.query(By.css('.number-input'));
        let numberInput = numberDebug.nativeElement as HTMLInputElement;

        fakeTyping('12abc34de', numberInput);


    function fakeTyping(value: string, inputEl: HTMLInputElement) {
        let result: string = '';
        for (let char of value) {
            let eventMock = createKeyDownEvent(char);
            if (eventMock.defaultPrevented) {
                // invalid char
            } else {
                result = result.concat(char);

        inputEl.value = result;
        inputEl.dispatchEvent(new Event('input'));
export function createKeyDownEvent(value: string, cancelable = true) {  
    return new KeyboardEvent('keydown', { key: value, cancelable })  
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