docstr: Group betweenness centrality in a disconnected graph
docstr_tok: ["Group","betweenness","centrality","in","a","disconnected","graph"]
code: def test_group_betweenness_disconnected_graph(self):
      """
      Group betweenness centrality in a disconnected graph
      """
      G = nx.path_graph(5)
      G.remove_edge(0, 1)
      C = [1]
      b = nx.group_betweenness_centrality(
          G, C, weight=None, normalized=False
      )
      b_answer = 0.0
      assert b == b_answer
  
imports: import pytest
  import networkx
label_desc: Use image node_id 6 for calling the TestGroupBetweennessCentrality obj's underlying member method code with example usage: obj.test_group_betweenness_disconnected_graph() without return types