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Sunday, 20 August 2017

Lightning Testing Service Part 2 - Custom Jasmine Reporter

Lightning Testing Service Part 2 - Custom Jasmine Reporter

Customjasmine

(Note: This blog applies to the Jasmine variant of the Lightning Testing Service)

Introduction

One of the cool things about Jasmine is how easy it is to add your own reporter. Compared to some of the other JavaScript testing frameworks I’ve used in the past, it’s entirely straightforward. Essentially you are implementing an interface, although as JavaScript doesn’t have interfaces it’s very much based on what you should rather than must implement. A Jasmine Reporter is a JavaScript object with the appropriate functions for the framework to call when something interesting happens. Even cooler is the fact that the framework first checks that you have provided the function before it is invoked, so if you don’t care about specific events, you just leave out the functions to handle those events and you are all good.

Functions

Some or all of the following functions are required to handle the various events that occur as test are executed - basically things commencing and completing:

  • jasmineStarted/jasmineDone - called before any specs (tests) execute/once all tests have completed
  • suiteStarted/suiteDone - called before a specific suite (group of tests) execute/once they have completed
  • specStarted/specDone - called before a specific test executes/once it has completed

Once you have your object with the desired functions, it must be registered before any tests are queued:

jasmine.getEnv().addReporter(your_reporter);

and that’s all there is to it.

Example

Below is an example lightning component that creates a simple reporter to capture the success/failure of each suite/spec and log information to the console. Note that this relies on the Jasmine artefacts installed by the latest version of the Lightning Testing Service unmanaged package. The component is named KABJasmineReporter:

Component

<aura:component extensible="true">
    <ltng:require scripts="{!join(',',
				$Resource.lts_jasmine + '/lib/jasmine-2.6.1/jasmine.js',
				$Resource.lts_jasmine + '/lib/jasmine-2.6.1/jasmine-html.js',
				$Resource.lts_jasmineboot
				)}"
                  afterScriptsLoaded="{!c.doInit}" />
</aura:component>

Controller

({
	doInit : function(component, event, helper) {
		helper.initialiseJasmineReporter(component, event);
	}
})

Helper

({
    myReporter : {
        content : '',
        suites : [],
        totalSuccesses:0,
        totalFailures:0,
        totalTests:0,
        output : function(message) {
            console.log(message);
            this.content+=message;
        },
        clear: function() {
            this.content='';
            this.suites=[];
            this.totalSuccesses=0;
            this.totalFailures=0;
            this.totalTests=0;
        },
        getCurrentSuite: function() {
            return this.suites[this.suites.length-1];
        },
        getCurrentSpec : function() {
            return this.getCurrentSuite().specs[this.getCurrentSuite().specs.length - 1];
        },
        jasmineStarted: function(suiteInfo) {
            this.output('Running suite with ' + suiteInfo.totalSpecsDefined + ' specs');
        },
        suiteStarted: function(result) {
            this.output('Suite started: ' + result.description + ' whose full description is: ' + result.fullName);
            this.suites.push({name : result.fullName,
                              specs : []});
        },
        specStarted: function(result) {
            this.output('Spec started: ' + result.description + ' whose full description is: ' + result.fullName);
            this.getCurrentSuite().specs.push({name: result.description,
                                               failures: [],
                                               failureCount: 0,
                                               successes: 0});
        },
        specDone: function(result) {
            this.output('Spec: ' + result.description + ' complete status was ' + result.status);
            this.output(result.failedExpectations.length + ' failures');
            for(var i = 0; i < result.failedExpectations.length; i++) {
                var failure=result.failedExpectations[i];
                this.output('Failure: ' + failure.message);
                this.output(failure.stack);
                this.getCurrentSpec().failures.push({message: failure.message,
                                                     stack : failure.stack});
                this.getCurrentSpec().failureCount++;
                this.totalFailures++;
            }
            this.output(result.passedExpectations.length + ' successes');
            this.getCurrentSpec().successes+=result.passedExpectations.length;
            this.totalSuccesses+=result.passedExpectations.length;
        },
        suiteDone: function(result) {
            this.output('Suite: ' + result.description + ' was ' + result.status);
            for(var i = 0; i < result.failedExpectations.length; i++) {
                this.output('AfterAll ' + result.failedExpectations[i].message);
                this.output(result.failedExpectations[i].stack);
            }
        },
        jasmineDone: function() {
            this.totalTests=this.totalSuccesses+this.totalFailures;
	        this.output('Finished tests');
    	    this.output('Successes : ' + this.totalSuccesses);
	        this.output('Failures : ' + this.totalFailures);
	        this.output('Details : ' + JSON.stringify(this.suites, null, 4));
        }
    },
    initialiseJasmineReporter : function(component, event) {
        console.log('Initialising jasmine reporter');
        var self=this;
        this.myReporter.clear();
        var env = jasmine.getEnv();
        jasmine.getEnv().addReporter(this.myReporter);
    }
})

A couple of tweaks to the jasmineTests app to include my reporter (and to limit to a couple of tests, otherwise there’s a lot of information in the console log):

App

<aura:application >
    <c:KAB_JasmineReporter />
    <c:lts_jasmineRunner testFiles="{!join(',',
    	$Resource.jasmineHelloWorldTests
    )}" />
</aura:application>

Executing the app produces the following console output:

Initialising jasmine reporter
Running suite with 2 specs
Suite started: A simple passing test whose full description is: A simple passing test
Spec started: verifies that true is always true whose full description is: A simple passing test verifies that true is always true
Spec: verifies that true is always true complete status was passed
0 failures
1 successes
Suite: A simple passing test was finished
Suite started: A simple failing test whose full description is: A simple failing test
Spec started: fails when false does not equal true whose full description is: A simple failing test fails when false does not equal true
Spec: fails when false does not equal true complete status was pending
0 failures
0 successes
Suite: A simple failing test was finished
Finished tests
Successes : 1
Failures : 0
Details : [
    {
        "name": "A simple passing test",
        "specs": [
            {
                "name": "verifies that true is always true",
                "failures": [],
                "failureCount": 0,
                "successes": 1
            }
        ]
    },
    {
        "name": "A simple failing test",
        "specs": [
            {
                "name": "fails when false does not equal true",
                "failures": [],
                "failureCount": 0,
                "successes": 0
            }
        ]
    }
]

Conclusion

While this has been a simple example, there’s a lot more that can be done with custom reporters, such as posting notifications with the tests results, which I plan to explore in later posts. 

Related Posts

 

Saturday, 5 August 2017

Lightning experience utility bar - add an app for that

Lightning experience utility bar - add an app for that

Introduction

This week I’ve been working on adding utility bar functionality to our BrightMedia appcelerator. Typically when I build functionality of this nature I’ll start off with with the component markup using hardcoded values to get the basic styling right, then make it dynamic with the data coming from the JavaScript controller/helper, before finally wiring it up to an Apex controller that extract data from the Salesforce database, either through sobjects or custom settings.

For the purposes of this blog I’m going to say that it was presenting a list of Trailmixes, the new feature in Trailhead (it wasn’t, but this is a much simpler example and taps into the zeitgeist).

First incarnation

The version of the component that simply displayed a Trailmix with a button to open it:

<aura:component implements="flexipage:availableForAllPageTypes"
                access="global">
    
    <div class="slds-p-around--x-small slds-border--bottom slds-theme--shade">
        <div class="slds-grid slds-grid--align-spread slds-grid--vertical-align-center">
            <div>
                Blog Trailmix
            </div>
            <div>
            </div>
            <div>
                <lightning:buttonIcon iconName="utility:open"
                                      title="Open"
                                      alternativeText="Open" variant="border-filled"/>
            </div>
        </div>
    </div>
</aura:component>

and, not surprisingly, this worked fine:

Screen Shot 2017 08 05 at 16 54 45

Second incarnation

The second version initialised a list of Trailmixes, still containing a single element, in the JavaScript controller, which the component then iterated. First the component:

<aura:component implements="flexipage:availableForAllPageTypes"
                access="global">
    
    <aura:attribute name="mixes" type="Object[]" />
    
    <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
    
    <aura:iteration items="{!v.mixes}" var="mix">
        <div class="slds-p-around--x-small slds-border--bottom slds-theme--shade">
            <div class="slds-grid slds-grid--align-spread slds-grid--vertical-align-center">
                <div>
                    {!mix.name}
                </div>
                <div>
                </div>
                <div data-record="{!mix.key}">
                    <lightning:buttonIcon onclick="{!c.OpenMix}"
                                          iconName="utility:open"
                                          title="Open"
                                          alternativeText="Open" variant="border-filled"/>
                </div>
            </div>
        </div>
    </aura:iteration>
</aura:component>

Next, the controller

({
	doInit : function(component, event, helper) {
        var mixes[];
        mixes.push({key:"BLOG",
                    name:"Blog Trailmix",
                    link:"https://trailhead.salesforce.com/users/0055000000617DXAAY/trailmixes/basics"});
		component.set('v.mixes', mixes);
    }
})

Here things started to go awry - clicking the utility bar item to open it did nothing and a few seconds later a toast message would appear, with a message along the lines of “we’re still working on your request”, but nothing further. Changing the component in the utility bar configuration to initialise in the background got a little further, but still no content, instead a perpetual spinner:

Screen Shot 2017 08 05 at 17 03 23

 

Viewing the JavaScript console showed nothing out of the ordinary. I’d been having a few problems with my internet connection soI assumed it was either that or Salesforce having an issue, and as it was fairly late at night I decided to leave it until the morning to see if things were resolved. No such luck.

Wrap it and app it

I then did what I usually do when I’m having issues with a lightning component - create an app with just the component in and see what happens then. The app couldn’t be simpler:

<aura:application >
    <c:Trailmixes />
</aura:application>

Previewing this showed that there was an error that was somehow being swallowed:

Screen Shot 2017 08 05 at 17 08 10

which I’m sure the eagle-eyed reader has spotted - the declaration of my mixes variable that eventually gets stored as an attribute was missing an ‘=‘ character:

var mixes[];

After correcting this and refreshing the page a couple of times, and I was back on track with my Trailmix component. 

In conclusion

Always try any troublesome component in an app of it’s own - while in most cases you won’t have the utility bar swallowing errors, it’s way easier to debug a component when there aren’t 50 others on the same page firing events and changing attributes. Also, sometimes a syntax type error was shown in the JavaScript console and sometimes not, so look there first.

Related posts