code: def test_negative_input():
      assert not nx.is_graphical([-1], "hh")
      assert not nx.is_graphical([-1], "eg")
  
file_path: networkx/networkx/algorithms/tests/test_graphical.py
imports: import pytest
  import networkx
label_desc: Use image node_id 5 for calling a global function with example usage: test_negative_input() without return types