How to write unit test methods form MVVM pattern WPF viewmodel classes?

I am not able to mock the navigationcontext using moq framework.
Can anyone help on this

Constructor
--------------
 public CreateQuestionsViewModel(IEventAggregator eventAggregator, IUnityContainer unityContainer)
            : base(eventAggregator, unityContainer)
        {
            FrameWorkManager.Log(DisplayMessages.msgBoxInitrCreateViewModelLog);
            Initialize();
        }

Method
---------
 public override void OnNavigatedTo(NavigationContext navigationContext)
        {
            try
            {
                using (new WaitCursor())
                {
                    if (navigationContext.NavigationService.Region.Context != null)
                    {
                        if (navigationContext.NavigationService.Region.Context is QuestionDTO question)
                        {
                            if (navigationContext.Parameters[Constants.ISUSEREDITING_QUESTION] != null)
                            {
                                _IsQuestionEditing = (bool)navigationContext.Parameters[Constants.ISUSEREDITING_QUESTION];
                            }
                            if (navigationContext.Parameters[Constants.ISUSERCLONING_QUESTION] != null)
                            {
                                _IsQuestionCloning = (bool)navigationContext.Parameters[Constants.ISUSERCLONING_QUESTION];
                                CloneQuestionCommand.RaiseCanExecuteChanged();
                            }
                            LoadQuestionForCloningOrEditing(question);
                        }
                        EnableDisableSavePreviewButtons();
                    }
                    else
                        _AddNewQuestionInstance = true;

                }
            }
            catch (Exception ex)
            {
                FrameWorkManager.PublishException(ex);
                MessageBoxService.Show(DisplayMessages.strErrorLoadingQuestion, DisplayMessages.msgBoxErrorCaption, DXMVVM.MessageButton.OK, DXMVVM.MessageIcon.Error, DXMVVM.MessageResult.OK);

            }
        }

Below are the other methods name inside the viewmodel
public override void OnNavigatedFrom(NavigationContext navigationContext)

public override void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback)