code: def test_digraph_orientation_invalid(self):
      G = nx.DiGraph(self.edges)
      edge_iterator = edge_dfs(G, self.nodes, orientation="hello")
      pytest.raises(nx.NetworkXError, list, edge_iterator)
  
imports: import pytest
  import networkx
  from networkx.algorithms import edge_dfs
  from networkx.algorithms.traversal.edgedfs import FORWARD, REVERSE
label_desc: Use image node_id 5 for calling the TestEdgeDFS obj's underlying member method code with example usage: obj.test_digraph_orientation_invalid() without return types