Unit testing - Getting issue with Alert Controller in Ionic Framework - ionic-framework

Question

I am trying to write a testcase for a method which has been called or not. Inside that method, I am calling an alert confirmation box.
I am getting an error like
Failed: this.alertCtrl.create is not a function
Component.ts
submitTicket(comments) {
if (comments.length > 0) {
const prompt = this.alertCtrl.create({
title: "<span> Improve Solution </span>",
message: "<span>" + 'Are you sure you want <br>' + "</span>" +
"<span>" + 'to submit this improvement' + "</span>",
enableBackdropDismiss: false,
buttons: [
{
text: 'Cancel',
handler: data => {
// Some stuff
}
},
{
text: 'Improve Solution',
handler: data => {
//Some stuff
}
}
]
});
prompt.present();
} else {
this.errorMsg = true;
}
}
component.spec.ts
import {AlertControllerMock } from 'ionic-mocks';
beforeEach(async(()=> {
TestBed.configureTestingModule({
declarations: [ImprovedsolutionsPage],
imports: [
IonicModule.forRoot(ImprovedsolutionsPage),
HttpClientTestingModule
],
providers: [
NavController,
AppService,
AlertController,
ImprovedsolutionsPage,
{provide: ViewController, useClass: ViewControllerMock},
{provide: LoadingController, useClass: LoadingControllerMock},
{provide: AlertController, useClass: AlertControllerMock},
]
}).compileComponents
}))
beforeEach(()=> {
fixture=TestBed.createComponent(ImprovedsolutionsPage)
component=fixture.componentInstance
fixture.detectChanges()
})
it('should be call submitTicket method', async(()= > {
spyOn(component, 'submitTicket').and.callThrough()
let comment='Needs to improve in detailing '
component.submitTicket(comment)
expect(component.submitTicket).toHaveBeenCalled()
}))
Here I am using ionic-mocks module and I imported AlertControllerMock as shown in the above code. And I am using ionic version 3. For testing I am using Karma and jasmine
Could someone please help me out in this issue.

Answer 1

[Updated] Here is my tip: I am not able to check your mock's implementation. However, make sure you have a separate boolean var to testify if the mocked function, for example, create, is called elsewhere.
create(opts?: AlertOptions): Promise<HTMLIonAlertElement> {
this.createAlertCalled = true;
this.opts = opts;
const self = this;
return Promise.resolve(<HTMLIonAlertElement>{
present: (): Promise<void> => {
self.presentCalled = true;
return Promise.resolve();
}
});
}
Subsequently, do a spyOn with AlertControllerMock on the mentioned variable and expect the assertion to be truthy.