Method constructor

packages/core/src/testability/testability.ts:104–126

(
    private _ngZone: NgZone,
    private registry: TestabilityRegistry,
    @Inject(TESTABILITY_GETTER) testabilityGetter: GetTestability,
  )

  private readonly pendingTasksInternal = inject(PendingTasksInternal);
  private readonly _usePendingTasks = inject(USE_PENDING_TASKS);
  constructor(
    private _ngZone: NgZone,
    private registry: TestabilityRegistry,
    @Inject(TESTABILITY_GETTER) testabilityGetter: GetTestability,
  ) {
    // Attempt to retrieve a `DestroyRef` optionally.
    // For backwards compatibility reasons, this cannot be required.
    if (isInInjectionContext()) {
      this._destroyRef = inject(DestroyRef, {optional: true}) ?? undefined;
    }

    // If there was no Testability logic registered in the global scope
    // before, register the current testability getter as a global one.
    if (!_testabilityGetter) {
      setTestabilityGetter(testabilityGetter);
      testabilityGetter.addToWindow(registry);
    }
    this._watchAngularEvents();
    _ngZone.run(() => {
      this._taskTrackingZone =
        typeof Zone == 'undefined' ? null : Zone.current.get('TaskTrackingZone');
    });
  }

  private _watchAngularEvents(): void {
    const onUnstableSubscription = this._ngZone.onUnstable.subscribe({