docstr: Group betweenness centrality for group with more than
  1 node and normalized
docstr_tok: ["Group","betweenness","centrality","for","group","with","more","than","1","node","and","normalized"]
code: def test_group_betweenness_normalized(self):
      """
      Group betweenness centrality for group with more than
      1 node and normalized
      """
      G = nx.path_graph(5)
      C = [1, 3]
      b = nx.group_betweenness_centrality(
          G, C, weight=None, normalized=True, endpoints=False
      )
      b_answer = 1.0
      assert b == b_answer
  
imports: import pytest
  import networkx
label_desc: Use image node_id 3 for calling the TestGroupBetweennessCentrality obj's underlying member method code with example usage: obj.test_group_betweenness_normalized() without return types