code: def test_panther_similarity_source_not_found(self):
      G = nx.Graph()
      G.add_edges_from([(0, 1), (0, 2), (0, 3), (1, 2), (2, 4)])
      with pytest.raises(
          nx.NodeNotFound, match="Source node 10 not in G"
      ):
          nx.panther_similarity(G, source=10)
  
imports: import pytest
  import networkx
  from networkx.algorithms.similarity import graph_edit_distance, optimal_edit_paths, optimize_graph_edit_distance
  from networkx.generators.classic import circular_ladder_graph, cycle_graph, path_graph, wheel_graph
label_desc: Use image node_id 41 for calling the TestSimilarity obj's underlying member method code with example usage: obj.test_panther_similarity_source_not_found() without return types