code: def test_multigraph(self):
      with pytest.raises(nx.NetworkXException):
          nx.katz_centrality(nx.MultiGraph(), 0.1)
  
imports: import math
  import pytest
  import networkx
label_desc: Use image node_id 7 for calling the TestKatzCentralityNumpy obj's underlying member method code with example usage: obj.test_multigraph() without return types