Class ComponentFixture

packages/core/testing/src/component_fixture.ts:47–294

 * @publicApi
 */
export class ComponentFixture<T> {
  /**
   * The DebugElement associated with the root element of this component.
   */
  debugElement: DebugElement;

  /**
   * The instance of the root component class.
   */
  componentInstance: T;

  /**
   * The native element at the root of the component.
   */
  nativeElement: any;

  /**
   * The ElementRef for the element at the root of the component.
   */
  elementRef: ElementRef;

  /**
   * The ChangeDetectorRef for the component
   */
  changeDetectorRef: ChangeDetectorRef;

  private _renderer: RendererFactory2 | null | undefined;
  private _isDestroyed: boolean = false;
  /** @internal */
  protected readonly _noZoneOptionIsSet = inject(ComponentFixtureNoNgZone, {optional: true});
  /** @internal */
  protected _ngZone: NgZone = this._noZoneOptionIsSet ? new NoopNgZone() : inject(NgZone);
  // Inject ApplicationRef to ensure NgZone stableness causes after render hooks to run
  // This will likely happen as a result of fixture.detectChanges because it calls ngZone.run
  // This is a crazy way of doing things but hey, it's the world we live in.
  // The zoneless scheduler should instead do this more imperatively by attaching
  // the `ComponentRef` to `ApplicationRef` and calling `appRef.tick` as the `detectChanges`
  // behavior.
  /** @internal */
  protected readonly _appRef = inject(ApplicationRef);
  private readonly _testAppRef = this._appRef as unknown as TestAppRef;
  private readonly pendingTasks = inject(PendingTasksInternal);
  private readonly appErrorHandler = inject(TestBedApplicationErrorHandler);
  private readonly zonelessEnabled = inject(ZONELESS_ENABLED);
  private readonly scheduler = inject(ɵChangeDetectionScheduler);
  private readonly rootEffectScheduler = inject(EffectScheduler);
  private readonly autoDetectDefault = this.zonelessEnabled ? true : false;
  private autoDetect =
    inject(ComponentFixtureAutoDetect, {optional: true}) ?? this.autoDetectDefault;

  private subscriptions = new Subscription();

  // TODO(atscott): Remove this from public API
  ngZone = this._noZoneOptionIsSet ? null : this._ngZone;

  /** @docs-private */
  constructor(public componentRef: ComponentRef<T>) {
    this.changeDetectorRef = componentRef.changeDetectorRef;