docstr: Group degree centrality for a single node group
docstr_tok: ["Group","degree","centrality","for","a","single","node","group"]
code: def test_group_degree_centrality_single_node(self):
      """
      Group degree centrality for a single node group
      """
      G = nx.path_graph(4)
      d = nx.group_degree_centrality(G, [1])
      d_answer = nx.degree_centrality(G)[1]
      assert d == d_answer
  
imports: import pytest
  import networkx
label_desc: Use image node_id 1 for calling the TestGroupDegreeCentrality obj's underlying member method code with example usage: obj.test_group_degree_centrality_single_node() without return types