code: def test_update_node_parents(self):
      self.G.add_nodes_from(["a", "b", "c"])
      self.G.add_edges_from([("a", "b"), ("a", "c")])
      self.assertListEqual(list(self.G.predecessors("a")), [])
      self.assertListEqual(list(self.G.predecessors("b")), ["a"])
      self.assertListEqual(list(self.G.predecessors("c")), ["a"])
  
imports: import unittest
  import networkx
  import pandas
  import numpy
  from pgmpy.models import NaiveBayes
  from pgmpy.independencies import Independencies
label_desc: Use image node_id 14 for calling the TestBaseModelCreation obj's underlying member method code with example usage: obj.test_update_node_parents() without return types