Angular2 trigger button click in unit test and verify event handling

Question

I'm trying to test if click event is properly handled. I'm trying to trigger click event on a button and check if proper call on router was executed. Don't know why stubRouteSpy did not registered call to navigate (last expect fails)

Template code:

<div class="col-lg-3 col-md-4 col-xs-6 thumb project" *ngFor="let project of projects">
    <div class = "thumbnail">
        <img class="img-responsive img-rounded" src="{{project.imgUrl}}" alt="">
        <div class = "caption">
         <h4 id='titleHeader'>{{project.title}}</h4>
         <div class="btn-group" role="group" style="all">
          <button class="btn btn-primary">Order</button>
          <button id='customizeButton' class="btn btn-info" (click)="onCustomize(project.id)">Customize</button>
        </div>
    </div>
</div>

Component code:

public errorMessage = '';
public projects = [];

constructor(private router: Router, private projectListService: ProjectListService) {
}

public ngOnInit() {
    this.getProjects();
}

public getProjects() {
    this.projectListService.getAllProjects()
        .subscribe(
            (projects) => this.projects = projects,
            (error) =>  this.errorMessage = <any> error);
}

public onCustomize(id: string) {
    console.log(id);
    let navigate = this.router.navigate(['design', id]);
}

Spec code:

describe('GalleryComponent (inline template)', () => {

    let comp: GalleryComponent;
    let fixture: ComponentFixture<GalleryComponent>;
    let projectListService: ProjectListService;
    let spy: jasmine.Spy;
    let de: DebugElement[];
    let stubRoute: Router;
    let stubRouteSpy: jasmine.Spy;

    beforeEach(() => {
        stubRoute = <Router> { navigate: ([]) => {}};
        TestBed.configureTestingModule({
            declarations: [GalleryComponent],
            providers: [
                ProjectListService,
                {provide: Router, useValue: stubRoute},
                {provide: Http, useValue: {}}
                ],
        });

        fixture = TestBed.createComponent(GalleryComponent);
        comp = fixture.componentInstance;

        // ProjectListService actually injected into the component
        projectListService = fixture.debugElement.injector.get(ProjectListService);

        // Setup spy on the `getAllProjects` method
        let fakeProjects = [new Project(1, 'title1', ''), new Project(2, 'title2', '')];
        spy = spyOn(projectListService, 'getAllProjects')
            .and.returnValue(Observable.of<Project[]>(fakeProjects));

        stubRouteSpy = spyOn(stubRoute, 'navigate');
    });

    it('should navigate to designer when customize button clicked', async(() => {
        fixture.detectChanges(); // init
        fixture.whenStable().then(() => { // wait for async getAllProjects
            fixture.detectChanges(); // update view with projects

            fixture.nativeElement.querySelectorAll('#customizeButton')[0].click();
            expect(fixture.nativeElement.querySelectorAll('#customizeButton').length).toBe(2); // this pass

            fixture.detectChanges();

            expect(stubRouteSpy.calls.any()).toBe(true, 'navigate called'); // this is false
        });
    }));
});

Northern · Accepted Answer · 2017-03-10 15:56:19Z

1

According the documentation here, you should get the provided RouterStub from the injector.

I suggest you use the example in the documentation.

the stub class:

class RouterStub {
    navigateByUrl(url: string) { return url; }
}

provide:

{ provide: Router,      useClass: RouterStub }

get injector:

routerStub = fixture.debugElement.injector.get(RouterStub);

answered Mar 10, 2017 at 15:56

Northern

2,5582 gold badges19 silver badges20 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

mrh Over a year ago

Thanks! This is exactly what I was doing wrong. After getting instance from injector test passed

Collectives™ on Stack Overflow

Angular2 trigger button click in unit test and verify event handling

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related