code: def test_add_multiple_edges(self):
      self.graph.add_edges_from([("a", "phi1"), ("b", "phi1")])
      self.assertListEqual(
          sorted(self.graph.nodes()), ["a", "b", "phi1"]
      )
      self.assertListEqual(
          hf.recursive_sorted(self.graph.edges()),
          [["a", "phi1"], ["b", "phi1"]],
      )
  
imports: import numpy
  import unittest
  from pgmpy.factors.discrete import DiscreteFactor
  from pgmpy.models import FactorGraph
  from pgmpy.models import MarkovNetwork
  from pgmpy.models import JunctionTree
  from pgmpy.tests import help_functions
label_desc: Use image node_id 7 for calling the TestFactorGraphCreation obj's underlying member method code with example usage: obj.test_add_multiple_edges() without return types