I think all links from this post: How to catch errors in VTK seem to be broken.
The first one might be this one: vtkTestingOutputWindow
And the latest might be this one: https://github.com/Slicer/Slicer/blob/47deb76d7556e40de4e25e585c4b24a63a153da5/Libs/MRML/Core/Testing/vtkMRMLDisplayableHierarchyNodeTest3.cxx#L262