code: def test_get_parents(self):
      parents_expected = {
          "bowel_problem": [],
          "dog_out": ["bowel_problem", "family_out"],
          "family_out": [],
          "hear_bark": ["dog_out"],
          "kid": [],
          "light_on": ["family_out"],
      }
      parents = self.reader.variable_parents
      for variable in parents_expected:
          self.assertListEqual(
              parents_expected[variable], parents[variable]
          )
  
imports: import os
  import unittest
  import xml.etree.ElementTree
  import numpy
  import numpy.testing
  from pgmpy import config
  from pgmpy.factors.discrete import TabularCPD
  from pgmpy.models import BayesianNetwork
  from pgmpy.readwrite import XMLBIFReader, XMLBIFWriter
label_desc: Use image node_id 4 for calling the TestXMLBIFReaderMethods obj's underlying member method code with example usage: obj.test_get_parents() without return types