code: def test_remove_multiedge(self):
      G = self.K3
      G.add_edge(0, 1, key="parallel edge")
      G.remove_edge(0, 1, key="parallel edge")
      assert G.adj == {
          0: {1: {0: {}}, 2: {0: {}}},
          1: {0: {0: {}}, 2: {0: {}}},
          2: {0: {0: {}}, 1: {0: {}}},
      }
      G.remove_edge(0, 1)
      kd = {0: {}}
      assert G.adj == {0: {2: kd}, 1: {2: kd}, 2: {0: kd, 1: kd}}
      with pytest.raises(nx.NetworkXError):
          G.remove_edge(-1, 0)
  
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 15 for calling the TestMultiGraph obj's underlying member method code with example usage: obj.test_remove_multiedge() without return types