code: def test_null_graph():
      G = nx.Graph()
      assert not nx.is_biconnected(G)
      assert list(nx.biconnected_components(G)) == []
      assert list(nx.biconnected_component_edges(G)) == []
      assert list(nx.articulation_points(G)) == []
  
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 14 for calling a global function with example usage: test_null_graph() without return types