docstr: Betweenness centrality: disconnected path
docstr_tok: ["Betweenness","centrality",":","disconnected","path"]
code: def test_disconnected_path(self):
      """Betweenness centrality: disconnected path"""
      G = nx.Graph()
      nx.add_path(G, [0, 1, 2])
      nx.add_path(G, [3, 4, 5, 6])
      b_answer = {0: 0, 1: 1, 2: 0, 3: 0, 4: 2, 5: 2, 6: 0}
      b = nx.betweenness_centrality(G, weight=None, normalized=False)
      for n in sorted(G):
          assert b[n] == pytest.approx(b_answer[n], abs=1e-7)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 12 for calling the TestBetweennessCentrality obj's underlying member method code with example usage: obj.test_disconnected_path() without return types