code: def test_get_edges(self):
      edges_expected = [
          ["VisitToAsia", "Tuberculosis"],
          ["Smoking", "LungCancer"],
          ["Tuberculosis", "TbOrCa"],
          ["LungCancer", "TbOrCa"],
          ["TbOrCa", "XRay"],
          ["Smoking", "Bronchitis"],
          ["TbOrCa", "Dyspnea"],
          ["Bronchitis", "Dyspnea"],
      ]
      edges = self.reader.get_edges()
      for index, edge in enumerate(edges_expected):
          self.assertListEqual(edge, edges[index])
  
imports: import unittest
  import numpy
  from pgmpy import config
  from pgmpy.readwrite import NETReader, NETWriter
  from pgmpy.utils import compat_fns, get_example_model
label_desc: Use image node_id 6 for calling the TestNETReader obj's underlying member method code with example usage: obj.test_get_edges() without return types