code: def test_estimate_titanic(self):
      e1 = self.est_titanic.estimate()
      self.assertSetEqual(
          set(e1.edges()),
          set(
              [
                  ("Survived", "Pclass"),
                  ("Sex", "Pclass"),
                  ("Sex", "Survived"),
              ]
          ),
      )
  
file_path: pgmpy/pgmpy/tests/test_estimators/test_ExhaustiveSearch.py
imports: import unittest
  import numpy
  import pandas
  from pgmpy.estimators import BDeuScore, BicScore, ExhaustiveSearch
label_desc: Use image node_id 4 for calling the TestBaseEstimator obj's underlying member method code with example usage: obj.test_estimate_titanic() without return types