code: def test_header_data_io():
      bio = BytesIO()
      hdr = MincHeader()
      arr = np.arange(24).reshape((2, 3, 4))
      with pytest.raises(NotImplementedError):
          hdr.data_to_fileobj(arr, bio)
      with pytest.raises(NotImplementedError):
          hdr.data_from_fileobj(bio)
  
imports: import bz2
  import gzip
  import types
  import warnings
  from io import BytesIO
  from os.path import join
  import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from ..None import Nifti1Image, load, minc1
  from ..deprecated import ModuleProxy
  from ..deprecator import ExpiredDeprecationError
  from ..externals.netcdf import netcdf_file
  from ..minc1 import Minc1File, Minc1Image, MincHeader
  from ..optpkg import optional_package
  from ..testing import assert_data_similar, clear_and_catch_warnings, data_path
  from ..tmpdirs import InTemporaryDirectory
  from .None import test_spatialimages
  from .test_fileslice import slicer_samples
label_desc: Use image node_id 1 for calling a global function with example usage: test_header_data_io() without return types