code: def test_dateheader_unsupported(self):
      def read_dateheader_unsupported():
          with open(test8) as ofile:
              _, _ = read_header(ofile)
  
      assert_raises(ValueError, read_dateheader_unsupported)
  
imports: import datetime
  import os
  import sys
  from os.path import join
  from io import StringIO
  import numpy
  from numpy.testing import assert_array_almost_equal, assert_array_equal, assert_equal, assert_
  import pytest
  from pytest import raises
  from scipy.io.arff.arffread import loadarff
  from scipy.io.arff.arffread import read_header, ParseArffError
label_desc: Use image node_id 5 for calling the TestHeader obj's underlying member method code with example usage: obj.test_dateheader_unsupported() without return types