code: def test_add_edges_from_self_loop(self):
      self.assertRaises(ValueError, self.G.add_edges_from, [("a", "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 12 for calling the TestBaseModelCreation obj's underlying member method code with example usage: obj.test_add_edges_from_self_loop() without return types