code: def test_empty(self):
      G = nx.Graph()
      assert nx.hits(G) == ({}, {})
      assert _hits_numpy(G) == ({}, {})
      assert _hits_python(G) == ({}, {})
      assert _hits_scipy(G) == ({}, {})
  
file_path: networkx/networkx/algorithms/link_analysis/tests/test_hits.py
imports: import pytest
  import networkx
  from networkx.algorithms.link_analysis.hits_alg import _hits_numpy, _hits_python, _hits_scipy
label_desc: Use image node_id 4 for calling the TestHITS obj's underlying member method code with example usage: obj.test_empty() without return types