code: def test_edges(self):
      G = self.K3
      edges = [(0, 1), (0, 2), (1, 0), (1, 2), (2, 0), (2, 1)]
      assert sorted(G.edges()) == edges
      assert sorted(G.edges(0)) == [(0, 1), (0, 2)]
      pytest.raises((KeyError, nx.NetworkXError), G.edges, -1)
  
imports: from collections import UserDict
  import pytest
  import networkx
  from networkx.utils import edges_equal
  from .test_multigraph import BaseMultiGraphTester
  from .test_multigraph import TestEdgeSubgraph
  from .test_multigraph import TestMultiGraph
label_desc: Use image node_id 1 for calling the BaseMultiDiGraphTester obj's underlying member method code with example usage: obj.test_edges() without return types