public void ShouldRegisterOnIsBusyChangedMessage_WhenInitialized()
        {
            //act
            var navigationToolBarViewModel = new NavigationToolBarViewModel(_navigationServiceMock.Object, _messengerServiceMock.Object);

            //assert
            _messengerMock.Verify(x => x.Register(It.IsAny <object>(), It.IsAny <Action <IsBusyChangedMessage> >()), Times.Once);
        }
        public void ShouldNavigateToLoginPageAsync_WhenGotoLoginPage()
        {
            //arrange
            var navigationToolBarViewModel = new NavigationToolBarViewModel(_navigationServiceMock.Object, _messengerServiceMock.Object);

            //act
            navigationToolBarViewModel.GotoLoginPageCommand.Execute(null);

            //assert
            _navigationServiceMock.Verify(x => x.NavigateToLoginPageAsync(It.IsAny <NavigationData>()), Times.Once);
        }