// if we can't convert the obj to PV, just return
	if !ok {
		return nil
	}
	for _, f := range pv.Finalizers {
		if f == volumeutil.PVProtectionFinalizer {
			// Finalizer is already present, nothing to do
			return nil
		}
	}
	klog.V(4).Infof("adding PV protection finalizer to %s", pv.Name)
	pv.Finalizers = append(pv.Finalizers, volumeutil.PVProtectionFinalizer)

	return nil
}

 * `entryNodes` is not changed by this class.
 *
 * <h2>Note about finalizers</h2>
 * A dependency of a finalizer must not run until it is known to be needed by something else that should run.
 * So if the dependency is only required by a finalizer, then it should not start until the finalizer is ready to start

  /**
   * Iterates through the given loaders until it finds one that can load Finalizer.
   *
   * @return Finalizer.class
   */
  private static Class<?> loadFinalizer(FinalizerLoader... loaders) {
    for (FinalizerLoader loader : loaders) {
      Class<?> finalizer = loader.loadFinalizer();
      if (finalizer != null) {
        return finalizer;
      }
    }

    throw new AssertionError();
  }

	require.NoError(t, err)

	// Create a CR with a finalizer.
	ns := "not-the-default"
	name := "foo123"
	noxuResourceClient := newNamespacedCustomResourceClient(ns, dynamicClient, noxuDefinition)

	instance := fixtures.NewNoxuInstance(ns, name)
	instance.SetFinalizers([]string{"noxu.example.com/finalizer"})

	}{
		// PV events
		//
		{
			name:      "PV without finalizer -> finalizer is added",
			updatedPV: pv(),
			expectedActions: []clienttesting.Action{
				clienttesting.NewUpdateAction(pvVer, "", withProtectionFinalizer(pv())),
			},
		},
		{
			name:            "PVC with finalizer -> no action",
			updatedPV:       withProtectionFinalizer(pv()),

		},
		{
			name: "deleted PVC with finalizer + pod with the PVC exists -> finalizer is not removed",
			initialObjects: []runtime.Object{
				withPVC(defaultPVCName, pod()),
			},
			updatedPVC:      deleted(withProtectionFinalizer(pvc())),
			expectedActions: []clienttesting.Action{},
		},
		{
			name: "deleted PVC with finalizer + pod with unrelated PVC and EmptyDir exists -> finalizer is removed",

    }

    private boolean hasACycle(Node finalized, SetMultimap<FinalizerGroup, FinalizerGroup> reachableGroups) {
        if (!(finalized.getGroup() instanceof HasFinalizers) || finalized.getGroup().isReachableFromEntryPoint()) {
            // Is not a member of a finalizer group or will not be blocked
            return false;
        }
        HasFinalizers groups = (HasFinalizers) finalized.getGroup();

	ch := make(chan bool, 10)
	finalize := func(x *int) {
		if *x != 97531 {
			t.Errorf("finalizer %d, want %d", *x, 97531)
		}
		ch <- true
	}

	var finalizerTests = []struct {
		convert   func(*int) any
		finalizer any
	}{
		{func(x *int) any { return x }, func(v *int) { finalize(v) }},
		{func(x *int) any { return Tintptr(x) }, func(v Tintptr) { finalize(v) }},

			runtime.SetFinalizer(x, test.fin)

			runtime.KeepAlive(x)

			// Queue the finalizer.
			runtime.GC()
			runtime.GC()

			if !runtime.BlockUntilEmptyFinalizerQueue(int64(time.Second)) {
				t.Fatal("finalizer failed to execute")
			}
			if got := int(regConfirmRun.Load()); got != test.confirmValue {
				t.Fatalf("wrong finalizer executed? got %d, want %d", got, test.confirmValue)
			}
		})
	}

			// yet to sync the volume and add the pv deletion protection finalizer. The custom finalizer is some
			// pre-existing finalizer, for example the pv-protection finalizer. When csi-migration is disabled,
			// the migrated-to annotation will be removed shortly when updateVolumeMigrationAnnotationsAndFinalizers
			// is called followed by adding back the in-tree pv protection finalizer.