angular testing click event inside loop ngFor

Question

I'm trying to test the intention of the click event inside an *ngFor but I can't make the test pass.

this is my template:

<div class="container-notification-item" *ngFor="let item of menu.detail">
  <div class="notification-item" (click)="getDetailsMessage(item)">
    <div class="notification-item__icon" [ngClass]="item.iconStyle">
        <span>
          <i class={{item.icon}}></i>
        </span>
    </div>
    <div class="notification-item__text text-muted">
        <h6 [attr.class]="item.textStyle" [ngStyle]="{'font-size':'1.2rem' }">{{item.title}}</h6>
        <div>
            <p *ngIf="item.detail" class="detail-title">{{item.detail}}</p>
            <p *ngIf="item.time" class="detail-time">
              <i class="mdi mdi-clock-outline"></i>
              <span>{{item.time}}</span>
            </p>
        </div>
    </div>
  </div>
</div>

this is my component:

export class AccountMenuComponent implements DropdownMenuComponentInterface {

  @Input() menu: DropdownMenu;
  redirect = false;
  constructor() { }

  getDetailsMessage(item?: DropdownMenuDetail) {
    this.redirect = true;
  }

  getDetailsMessages() {
    console.log(this.menu.detail);
  }

}

and this is my test:

  it('must redirect to view all messages', () => {
    fixture.detectChanges();
    fixture.whenStable().then(() => {
      const elem: DebugElement[] = fixture.debugElement.queryAll(By.css('.notification-item'));
      console.log(elem[0]);

      elem[0].triggerEventHandler('click', null);

      expect(component.redirect).toBeTruthy();
    })
  })

when I do a console.log of the elem variable I have the html element selected but the test fails.

Wesley Trantham · Accepted Answer · 2022-10-18 00:58:12Z

I think the whenStable is throwing off when karma thinks the test has completed. I was able to get the following to run in a test project.

it('should create the app', (done) => {
  // setup that you probably have in a beforeEach
  const fixture = TestBed.createComponent(AppComponent);
  const component = fixture.componentInstance;
  const menu = {detail: ['a','b','c']};
  // suggest a fake parent component - but for simplicity I'm just assigning
  component.menu = menu;

  fixture.detectChanges();
  fixture.whenStable().then(() => {
    const elem: DebugElement[] = fixture.debugElement.queryAll(By.css('.notification-item'));
    console.log(elem[0]);

    elem[0].triggerEventHandler('click', null);

    // since the value itself is `true`, suggest strongly testing for exactly that 
    // instead of truthy, which allows more passing conditions
    expect(component.redirect).toBe(true);
    // call the function passed in to tell it that this test is now done
    // because your code is in a promise it runs asynchronously
    done();
  })
});

Normally you only need whenStable for template forms to finish doing their thing. It can also be used to get past a debounceTime from rxjs, but I suggest using fakeAsync and tick in that case.

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