code: def test_init_exception(self):
      self.assertRaises(ValueError, XMLBeliefNetwork.XBNReader)
  
imports: import io
  import sys
  import unittest
  import xml.etree.ElementTree
  import networkx
  import numpy
  import numpy.testing
  from pgmpy.factors.discrete import TabularCPD
  from pgmpy.models import BayesianNetwork
  from pgmpy.readwrite import XMLBeliefNetwork
label_desc: Use image node_id 2 for calling the TestXBNReaderTorch obj's underlying member method code with example usage: obj.test_init_exception() without return types