Function expectStableTexts

packages/core/test/application_ref_spec.ts:939–957

(component: Type<any>, expected: string[])

    });

    function expectStableTexts(component: Type<any>, expected: string[]) {
      const fixture = TestBed.createComponent(component);
      const appRef: ApplicationRef = TestBed.inject(ApplicationRef);
      const zone: NgZone = TestBed.inject(NgZone);
      appRef.attachView(fixture.componentRef.hostView);
      zone.run(() => appRef.tick());

      let i = 0;
      const sub = appRef.isStable.subscribe({
        next: (stable: boolean) => {
          if (stable) {
            expect(i).toBeLessThan(expected.length);
            expect(fixture.nativeElement).toHaveText(expected[i++]);
            stableCalled = true;
          }
        },
      });
      fixture.debugElement.injector.get(DestroyRef).onDestroy(() => sub.unsubscribe());
    }

    it('isStable should fire on synchronous component loading', waitForAsync(() => {
      expectStableTexts(SyncComp, ['1']);