code: def test_barbell():
      G = nx.barbell_graph(8, 4)
      nx.add_path(G, [7, 20, 21, 22])
      nx.add_cycle(G, [22, 23, 24, 25])
      pts = set(nx.articulation_points(G))
      assert pts == {7, 8, 9, 10, 11, 12, 20, 21, 22}
  
      answer = [
          {12, 13, 14, 15, 16, 17, 18, 19},
          {0, 1, 2, 3, 4, 5, 6, 7},
          {22, 23, 24, 25},
          {11, 12},
          {10, 11},
          {9, 10},
          {8, 9},
          {7, 8},
          {21, 22},
          {20, 21},
          {7, 20},
      ]
      assert_components_equal(
          list(nx.biconnected_components(G)), answer
      )
  
      G.add_edge(2, 17)
      pts = set(nx.articulation_points(G))
      assert pts == {7, 20, 21, 22}
  
file_path: networkx/networkx/algorithms/components/tests/test_biconnected.py
imports: import pytest
  import networkx
  from networkx import NetworkXNotImplemented
label_desc: Use image node_id 3 for calling a global function with example usage: test_barbell() without return types