code: def test_estimate_titanic(self):
      self.assertSetEqual(
          set(self.est_titanic2.estimate(show_progress=False).edges()),
          set(
              [
                  ("Survived", "Pclass"),
                  ("Sex", "Pclass"),
                  ("Sex", "Survived"),
              ]
          ),
      )
  
      self.assertTrue(
          ("Pclass", "Survived")
          in self.est_titanic2.estimate(
              fixed_edges=[("Pclass", "Survived")], show_progress=False
          ).edges()
      )
  
file_path: pgmpy/pgmpy/tests/test_estimators/test_HillClimbSearch.py
imports: import unittest
  import numpy
  import pandas
  from pgmpy.estimators import HillClimbSearch, K2Score
  from pgmpy.models import BayesianNetwork
label_desc: Use image node_id 6 for calling the TestHillClimbEstimator obj's underlying member method code with example usage: obj.test_estimate_titanic() without return types