code: def test_get_domain(self):
      domain_expected = {"var_1": "2", "var_2": "3", "var_0": "2"}
      self.assertDictEqual(self.reader_string.domain, domain_expected)
      self.assertDictEqual(
          self.reader_string_with_comment.domain, domain_expected
      )
  
imports: import unittest
  import networkx
  import numpy
  from pgmpy import config
  from pgmpy.factors.discrete import DiscreteFactor, TabularCPD
  from pgmpy.models import BayesianNetwork, MarkovNetwork
  from pgmpy.readwrite import UAIReader, UAIWriter
label_desc: Use image node_id 4 for calling the TestUAIReader obj's underlying member method code with example usage: obj.test_get_domain() without return types