docstr: Group closeness centrality for a group with more than
  1 node
docstr_tok: ["Group","closeness","centrality","for","a","group","with","more","than","1","node"]
code: def test_group_closeness_multiple_node(self):
      """
      Group closeness centrality for a group with more than
      1 node
      """
      G = nx.path_graph(4)
      c = nx.group_closeness_centrality(G, [1, 2])
      c_answer = 1
      assert c == c_answer
  
imports: import pytest
  import networkx
label_desc: Use image node_id 3 for calling the TestGroupClosenessCentrality obj's underlying member method code with example usage: obj.test_group_closeness_multiple_node() without return types