code: def test_remove_node(self):
      G = self.K3
      G.remove_node(0)
      assert G.adj == {1: {2: {0: {}}}, 2: {1: {0: {}}}}
      with pytest.raises(nx.NetworkXError):
          G.remove_node(-1)
  
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 8 for calling the TestMultiGraph obj's underlying member method code with example usage: obj.test_remove_node() without return types