Class AnimationComp

packages/core/test/acceptance/integration_spec.ts:3526–3546

      }

      @Component({
        selector: 'animation-comp',
        animations: [
          trigger('host', [
            state('void', style({height: '0px'})),
            transition('* => *', [animate('1s')]),
          ]),
        ],
        template: ` <ng-content></ng-content> `,
        standalone: false,

        changeDetection: ChangeDetectionStrategy.Eager,
      })
      class AnimationComp {
        @HostBinding('@host') public hostState = '';

        @HostListener('@host.start', ['$event'])
        onLeaveStart(event: AnimationEvent) {
          // we just want to register the listener
        }
      }

      TestBed.configureTestingModule({
        declarations: [Cmp, AnimationComp],