Bug#1064762: dune-grid: FTBFS: make[1]: *** [/usr/share/dune/dune-debian.mk:39: override_dh_auto_test] Error 1

[Markus Blatt]

Hi,

these tests write out vtk files and read them in using python3-vtk9.
If parsing of the file succeeds then the test was successful.

How the files are written did not change between Debian stable and Debian sid.
I have verified that the files are the same.

Attached is a small test case in python3-vtk9-test.tar.gz that mimics the
problems. The script test/vtkcheckcomb.py will read the file 
vtktest-1D-leafview-nonconforming-appendedbase64.vtp using different
relative paths with vtkXMLPolyDataReader.

On Debian stable all those cases succeed (see log file tests/stable/vtkcheckcomb.log.

On Debian sid all of the fail with this error of vtk xml parser:

2024-03-11 14:31:34.098 (   0.123s) [        A51E0740]       vtkXMLParser.cxx:375    ERR| vtkXMLDataParser (0x1659c80): Error parsing XML in stream at line 27, column 9, byte index 1562: not well-formed (invalid token)
2024-03-11 14:31:34.099 (   0.123s) [        A51E0740]       vtkXMLReader.cxx:521    ERR| vtkXMLPolyDataReader (0x15f4e90): Error parsing input file.  ReadXMLInformation aborting.
2024-03-11 14:31:34.099 (   0.123s) [        A51E0740]       vtkExecutive.cxx:752    ERR| vtkCompositeDataPipeline (0x1631800): Algorithm vtkXMLPolyDataReader(0x15f4e90) returned failure for request: vtkInformation (0x166e920)
   Debug: Off
   Modified Time: 775
   Reference Count: 1
   Registered Events: (none)
   Request: REQUEST_INFORMATION
   ALGORITHM_AFTER_FORWARD: 1
   FORWARD_DIRECTION: 0

I have no clue why this is the case. To me it is more likely that the problem
is due a change in vtk9. Hence I am reassinging to vtk9 in the hope
that the maintainers there have more clues than me.

Best,

Markus


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