code: def test_write_xmlbif_statefull(self):
      self.writer.write_xmlbif("dog_problem_output.xbif")
      with open("dog_problem_output.xbif", "r") as f:
          file_text = f.read()
      reader = XMLBIFReader(string=file_text)
      model = reader.get_model(state_name_type=str)
      self.assert_models_equivelent(self.expected_model, model)
      os.remove("dog_problem_output.xbif")
  
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 2 for calling the TestXMLBIFWriterMethodsString obj's underlying member method code with example usage: obj.test_write_xmlbif_statefull() without return types