Testing an Ext JS 6 App Generated with Sencha Cmd

Lately we have received a number of questions relating to testing Sencha Cmd applications. And since most applications written with the Sencha libraries (Ext JS and Sencha Touch) are generated using Sencha Cmd, we decided to write a little ‘How-to-guide’ to get you started with your javascript testing. Let’s get started!

Generating A Sencha Cmd 6 App

First of all, make sure you have the latest Cmd version installed. You can download it here. Let’s start from scratch by generating a new Sencha Cmd 6 application, this is done by running the following on the command line (from the Sencha getting started guide):

sencha -sdk /path/to/extjs/framework generate app MyApp MyApp
cd MyApp
sencha app watch

This will generate the following files in the MyApp folder in your file system.

Screen Shot 2015-07-19 at 14.19.36

As you can see we get an app folder with ‘model’, ‘store’ and ‘view’ folders along with an app.js which bootstraps the application. If you navigate to http://localhost:1841 in your browser, you’ll see the sample application with a few tabs and a grid panel.

Screen Shot 2015-07-27 at 10.58.42

Creating Your Test Harness

Now that the app is up and running, we create a tests folder in the root of the MyApp folder. Inside it we put our harness HTML page which contains the Siesta application, and a Harness JS file which contains details about the test suite:

<!DOCTYPE html>
        <link rel="stylesheet" type="text/css" href="localhost/siesta/resources/css/siesta-all.css">

        <script type="text/javascript" src="localhost/siesta/siesta-all.js"></script>

        <!-- The test harness -->
        <script type="text/javascript" src="index.js"></script>
var Harness = Siesta.Harness.Browser.ExtJS;

    title              : 'My Tests'

        group       : 'Unit Tests',
        pageUrl     : '../index.html?unittest',
        items       : [
        group : 'Application Tests',
        items : [

For our unit tests, we first need to make sure all our application JS classes get injected into each test. Instead of using preload for this, with Ext JS 6 we use pageUrl and set it to the root index.html page. By doing this, we let Ext JS choose and load the application files as it sees fit. We could’ve also selected to include only the JS classes being tested in each test, but this would require too much effort. If you run the test above, you’ll note that the application will start which is of course not desirable when doing unit tests. To fix this, we simply modify our app.js a little bit.

 * This file is generated and updated by Sencha Cmd. You can edit this file as
 * needed for your application, but these edits will have to be merged by
 * Sencha Cmd when upgrading.
    name: 'MyApp',

    extend: 'MyApp.Application',

    requires: [

    // The name of the initial view to create. With the classic toolkit this class
    // will gain a "viewport" plugin if it does not extend Ext.Viewport. With the
    // modern toolkit, the main view will be added to the Viewport.
    mainView: location.search.match('unittest') ? null : 'MyApp.view.main.Main'
    // Most customizations should be made to MyApp.Application. If you need to
    // customize this file, doing so below this section reduces the likelihood
    // of merge conflicts when upgrading to new versions of Sencha Cmd.

We simply add an inline check for the presence of a ‘unittest’ string in the query string. If this string exists, we prevent the application from starting. Now lets start writing a simple unit test. If you do it this way, each Ext JS class file will be loaded on demand which makes debugging very easy (compared to having one huge xx-all-debug.js). In your nightly builds, you should consider testing against a built test version of the app for faster test execution. You can build such a version by executing this Cmd statement:

sencha app build testing

Writing a Basic Unit Test

The Personnel store for the sample application looks like this:

Ext.define('MyApp.store.Personnel', {
    extend: 'Ext.data.Store',

    alias: 'store.personnel',

    fields: [
        'name', 'email', 'phone'

    data: { items: [
        { name: 'Jean Luc', email: "jeanluc.picard@enterprise.com", phone: "555-111-1111" },
        { name: 'Worf',     email: "worf.moghsson@enterprise.com",  phone: "555-222-2222" },
        { name: 'Deanna',   email: "deanna.troi@enterprise.com",    phone: "555-333-3333" },
        { name: 'Data',     email: "mr.data@enterprise.com",        phone: "555-444-4444" }

    proxy: {
        type: 'memory',
        reader: {
            type: 'json',
            rootProperty: 'items'

It doesn’t contain any logic yet, so let’s add a simple getUserByPhoneNumber method:

getUserByPhoneNumber : function(nbr) {
    // TODO

For now, we’ll just add a stub and focus on writing the test first. The test for this method will look like this:

describe('My first unit test', function(t) {

    t.ok(MyApp.view.main.Main, 'Found mainview');

    var store;

    t.beforeEach(function(t) {
        store = new MyApp.store.Personnel({
            data : [
                { name: 'Jean Luc', email: "jeanluc.picard@enterprise.com", phone: "555-111-1111" },
                { name: 'Worf',     email: "worf.moghsson@enterprise.com",  phone: "555-222-2222" }

    t.it('Should support getting a user by phone number lookup', function(t) {
        t.expect(store.getUserByPhoneNumber('555-111-1111').get('name')).toBe('Jean Luc');


This test asserts that we can lookup a valid phone number and get a user back, but also verifies that we get null when providing a non-existing phone number. Running this test confirms that we get failed assertions which is the first step of TDD. Now we can go ahead and write the simple implementation of the method:

getUserByPhoneNumber : function(nbr) {
   var index = this.find('phone', nbr);

   if (index < 0) return null;

   return this.getAt(index);

After running this in Siesta, you should a nice screen with all tests green.

Screen Shot 2015-07-23 at 12.09.15

Let’s continue looking at a more advanced type of test – application tests.

Creating an Application Smoke Test

For our application tests, we create the following test group in our Harness JS file.

    group       : 'Application Tests',
    hostPageUrl : '../index.html',
    items       : [

We also create a file called “smoketest.t.js” in the filesystem and place it in an “application-tests” folder.

describe('My first application test', function (t) {

    t.it('Should be possible to open all tabs', function (t) {
            { click : ">>tab[text=Users]" },

            { click : ">>tab[text=Groups]" },

            { click : ">>tab[text=Settings]" },

            { click : ">>tab[text=Home]" }

In this type of test we of course want the application to start normally so we just point the tests to the index.html file. The purpose of our smoke test is just to open each tab and make sure no exceptions are thrown.

Verifying Presence Of an Alert Dialog

Now let’s add one more test file, in which we assert that a popup is shown when clicking on a row in the Personnel grid:

Screen Shot 2015-07-25 at 12.04.51

describe('Personnel grid tests', function (t) {

    t.it('Should show a confirm popup when clicking grid row', function (t) {
            { click : "mainlist[title=Personnel] => table.x-grid-item" },

            // Make sure we see a window with proper title on a row double click
            { waitForCQVisible : 'window[title=Confirm]' },

            { click : ">>[itemId=yes]" }
Try running the suite

We’ve put the runnable test suite online if you want to try running these tests yourself. You can inspect the sources of each test and see how easy it is.


Testing applications generated with Sencha Cmd is just as easy as testing any other code base. We recommend that you start with unit testing your core files such as stores, model and logic classes. Once you have good coverage there, then also invest in a few application tests covering your most common user scenarios. If you’ve encountered any issues or problems with your Sencha testing, please let us know and we’ll try to help you.

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ante kotarac
ante kotarac

I tried this step by step and at the end I get blank page in another words – nothing happening.


Which step by step are referring to?

Thorsten Suckow-Homberg

Worked very well for me!I had to make a few changes to the index.html, though:

1) The urls in the href-attributes are malformed (protocol missing)
2) The path to the siesta library should be explained in more detailed. You’re assuming a localhost/-installation here, whereas I simply specify a reative path (../vendor/siesta/…) here.

This might be an issue for ante (see post above)/a few users…


@Thorsten, thanks for your feedback.

1. Can you please clarify? Urls aren’t malformed, intentionally left out the protocol as it’s irrelevant.

2. Makes sense, we’ll take this into account 🙂


Yeah I’ve already looked it up since I couldn’t believe something trivial like this would slip under your radar 🙂 For anyone who’s interested, it’s called protocol relative URL (RFC3986).

Roberto Lopez
Roberto Lopez

I followed all the steps and I am not getting the expected results, is similar to the runnable test suite online link that you provided:

Arcady Zherdev

Thing is this blog post now is a bit outdated. In the “Creating Your Test Harness” chapter ExtJS5 URLs are used while modern version of siesta needs ExtJS6.
I’ve just fixed the online test suite to use proper ExtJS 6.0.1 URLs so it’s working now.
You might want to do the same. Your harness page should link:
1) this stylesheet from extjs6.0.1 distribution:
2) and this js file from it:


These instructions do not really work for running tests on a build server against the production code that was built. Basically it forces your build server to do two builds, one for testing and one for production.


David, it certainly worked well for us. Could you please let us know what issues you faced?


I tried to do all by steps, but i got Cannot read property ‘store’ of undefined siesta-all.js

This messaged shows for block Harness.start()
I tried to set this block empty without any data and got this error too ^(( Spent some hours but dont understand where is a problem(


Vasily, please post in our Siesta forums and we’ll help you!



the website to download sencha has not worked in months. anybody notice that.