code: def test_add_edge_conflicting_key(self):
      G = self.Graph()
      G.add_edge(0, 1, key=1)
      G.add_edge(0, 1)
      assert G.number_of_edges() == 2
      G = self.Graph()
      G.add_edges_from([(0, 1, 1, {})])
      G.add_edges_from([(0, 1)])
      assert G.number_of_edges() == 2
  
imports: from collections import UserDict
  import pytest
  import networkx
  from networkx.utils import edges_equal
  from .test_graph import BaseAttrGraphTester
  from .test_graph import TestGraph
label_desc: Use image node_id 10 for calling the TestMultiGraph obj's underlying member method code with example usage: obj.test_add_edge_conflicting_key() without return types