code: def test_add_edges_from(self):
      G = self.G()
      G.add_edges_from([("B", "C")])  # test add_edges_from()
      assert G.has_edge("B", "C")
      if G.is_directed():
          assert not G.has_edge("C", "B")
      else:
          assert G.has_edge("C", "B")  # undirected
  
      G.add_edges_from([("D", "F"), ("B", "D")])
      assert G.has_edge("D", "F")
      assert G.has_edge("B", "D")
  
      if G.is_directed():
          assert not G.has_edge("D", "B")
      else:
          assert G.has_edge("D", "B")
  
imports: import pytest
  import networkx
  from networkx import convert_node_labels_to_integers
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 15 for calling the HistoricalTests obj's underlying member method code with example usage: obj.test_add_edges_from() without return types