code: def test_articulation_points():
      Ggen = _generate_no_biconnected()
      for flow_func in flow_funcs:
          for i in range(3):
              G = next(Ggen)
              errmsg = (
                  f"Assertion failed in function: {flow_func.__name__}"
              )
              assert (
                  nx.node_connectivity(G, flow_func=flow_func) == 1
              ), errmsg
  
imports: import itertools
  import pytest
  import networkx
  from networkx.algorithms import flow
  from networkx.algorithms.connectivity import local_edge_connectivity, local_node_connectivity
label_desc: Use image node_id 4 for calling a global function with example usage: test_articulation_points() without return types