def METHOD_NAME(self):
    """Test setting of global backend properties.
    This sets and gets global backend properties and only runs if
    compiled with SIONlib, as the corresponding backend is the
    only backend with global parameters.
    """
    nest.ResetKernel()
    if HAVE_SIONLIB:
        chunksize_before = nest.GetDefaults("sionlib", "sion_chunksize")
        sionlib_options = {"sion_chunksize": chunksize_before + 1}
        nest.SetDefaults("sionlib", sionlib_options)
        chunksize_after = nest.GetDefaults("sionlib", "sion_chunksize")
        self.assertEqual(chunksize_after, chunksize_before + 1)