Tests fail with ROOT 6.36

[lahwaacz]

Hi, I tried building version 5.6.3 for Arch Linux but the following tests fail:

FAILED tests/test_0420_pyroot_uproot_interoperability.py::test_from_pyroot - AttributeError: Failed to get attribute _Uproot_buffer_sizer from ROOT
FAILED tests/test_0420_pyroot_uproot_interoperability.py::test_write_pyroot_TObjString - AttributeError: Failed to get attribute _Uproot_buffer_sizer from ROOT
FAILED tests/test_0420_pyroot_uproot_interoperability.py::test_write_pyroot_TLorentzVector - AttributeError: Failed to get attribute _Uproot_buffer_sizer from ROOT
FAILED tests/test_0420_pyroot_uproot_interoperability.py::test_write_pyroot_TH1F - AttributeError: Failed to get attribute _Uproot_buffer_sizer from ROOT
FAILED tests/test_0705_rntuple_writing_metadata.py::test_ROOT - AttributeError: <namespace cppyy.gbl.ROOT.Experimental at 0x55c371cfa410> has no attribute 'RNTupleReader'. Full details:
  type object 'Experimental' has no attribute 'RNTupleReader'
  'ROOT::Experimental::RNTupleReader' is not a known C++ class
  'RNTupleReader' is not a known C++ template
  'RNTupleReader' is not a known C++ enum
FAILED tests/test_0965_inverted_axes_variances_hist_888.py::test_axes_of_variances_to_hist_2D_weighted - AttributeError: Failed to get attribute _Uproot_buffer_sizer from ROOT
FAILED tests/test_1000-write-TProfiles.py::test_write_TProfile - AttributeError: Failed to get attribute _Uproot_buffer_sizer from ROOT
FAILED tests/test_1356_basic_rntuple_writing.py::test_flat_arrays_ROOT - AttributeError: <namespace cppyy.gbl.ROOT.Experimental at 0x55c371cfa410> has no attribute 'RNTupleReader'. Full details:
  type object 'Experimental' has no attribute 'RNTupleReader'
  'ROOT::Experimental::RNTupleReader' is not a known C++ class
  'RNTupleReader' is not a known C++ template
  'RNTupleReader' is not a known C++ enum
FAILED tests/test_1395_rntuple_writing_lists_and_structs.py::test_writing_then_reading_with_ROOT - AttributeError: <namespace cppyy.gbl.ROOT.Experimental at 0x55c371cfa410> has no attribute 'RNTupleReader'. Full details:
  type object 'Experimental' has no attribute 'RNTupleReader'
  'ROOT::Experimental::RNTupleReader' is not a known C++ class
  'RNTupleReader' is not a known C++ template
  'RNTupleReader' is not a known C++ enum

Then I tried to build the previous version 5.6.2 and got the same failures. But when we built 5.6.2 in May, it was with ROOT 6.34.08 and the tests passed. Now we have ROOT 6.36.02

[ianna]

Hi @lahwaacz Thanks for reporting it! Indeed ROOT::Experimental::RNTupleReader became production-ready in ROOT 6.36.02: https://root.cern.ch/doc/master/classROOT_1_1RNTupleReader.html. We should update ROOT::Experimental::RNTupleReader to ROOT::RNTupleReader Thanks!

[ariostas]

The RNTuple failures are no big deal. That is test-only code, so we'll just fix that once ROOT 6.36 is in conda-forge and is being used in the CI. It usually takes a while for new versions to get there.

The other failures are actually important, since it seems there's some incompatibility with the new version of ROOT. I'll take a look at those.

[ariostas]

#1463 will fix this