public void RecordsLengthDesignerViewModel_UpdateHelp_ShouldCallToHelpViewMode()
{
//------------Setup for test--------------------------
var mockMainViewModel = new Mock <IShellViewModel>();
var mockHelpViewModel = new Mock <IHelpWindowViewModel>();
mockHelpViewModel.Setup(model => model.UpdateHelpText(It.IsAny <string>())).Verifiable();
mockMainViewModel.Setup(model => model.HelpViewModel).Returns(mockHelpViewModel.Object);
CustomContainer.Register(mockMainViewModel.Object);
var viewModel = new TestRecordsLengthDesignerViewModel(CreateModelItem());
//------------Execute Test---------------------------
viewModel.UpdateHelpDescriptor("help");
//------------Assert Results-------------------------
mockHelpViewModel.Verify(model => model.UpdateHelpText(It.IsAny <string>()), Times.Once());
}
