code: def test_single_node(self):
      # TODO Is this really the intended behavior for providing a
      # single node as the argument `nodes`? Shouldn't the function
      # just return the connectivity value itself?
      G = nx.trivial_graph()
      conn = nx.average_degree_connectivity(G, nodes=0)
      assert conn == {0: 0}
  
file_path: networkx/networkx/algorithms/assortativity/tests/test_connectivity.py
imports: from itertools import permutations
  import pytest
  import networkx
label_desc: Use image node_id 10 for calling the TestNeighborConnectivity obj's underlying member method code with example usage: obj.test_single_node() without return types