code: def test_communicability_betweenness_centrality(self):
      answer = {
          0: 0.07017447951484615,
          1: 0.71565598701107991,
          2: 0.71565598701107991,
          3: 0.07017447951484615,
      }
      result = communicability_betweenness_centrality(nx.path_graph(4))
      for k, v in result.items():
          assert answer[k] == pytest.approx(v, abs=1e-7)
  
      answer1 = {
          "1": 0.060039074193949521,
          "Albert": 0.315470761661372,
          "Aric": 0.31547076166137211,
          "Dan": 0.68297778678316201,
          "Franck": 0.21977926617449497,
      }
      G1 = nx.Graph(
          [
              ("Franck", "Aric"),
              ("Aric", "Dan"),
              ("Dan", "Albert"),
              ("Albert", "Franck"),
              ("Dan", "1"),
              ("Franck", "Albert"),
          ]
      )
      result1 = communicability_betweenness_centrality(G1)
      for k, v in result1.items():
          assert answer1[k] == pytest.approx(v, abs=1e-7)
  
file_path: networkx/networkx/algorithms/centrality/tests/test_subgraph.py
imports: import pytest
  import networkx
  from networkx.algorithms.centrality.subgraph_alg import communicability_betweenness_centrality, estrada_index, subgraph_centrality, subgraph_centrality_exp
label_desc: Use image node_id 4 for calling the TestSubgraph obj's underlying member method code with example usage: obj.test_communicability_betweenness_centrality() without return types