code: def test_empty_is_biconnected():
      G = nx.empty_graph(5)
      assert not nx.is_biconnected(G)
      G.add_edge(0, 1)
      assert not nx.is_biconnected(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 7 for calling a global function with example usage: test_empty_is_biconnected() without return types