code: def setup_method(self):
      self.Graph = nx.MultiGraph
      # build K3
      ed1, ed2, ed3 = ({0: {}}, {0: {}}, {0: {}})
      self.k3adj = {
          0: {1: ed1, 2: ed2},
          1: {0: ed1, 2: ed3},
          2: {0: ed2, 1: ed3},
      }
      self.k3edges = [(0, 1), (0, 2), (1, 2)]
      self.k3nodes = [0, 1, 2]
      self.K3 = self.Graph()
      self.K3._adj = self.k3adj
      self.K3._node = {}
      self.K3._node[0] = {}
      self.K3._node[1] = {}
      self.K3._node[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 1 for calling the TestMultiGraph obj's underlying member method code with example usage: obj.setup_method() without return types