code: def test_get_edges(self):
      edges_expected = {
          ("var_0", "var_1"),
          ("var_0", "var_2"),
          ("var_1", "var_2"),
      }
      self.assertSetEqual(self.reader_string.edges, edges_expected)
      self.assertSetEqual(
          self.reader_string_with_comment.edges, edges_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 5 for calling the TestUAIReader obj's underlying member method code with example usage: obj.test_get_edges() without return types