code: def test_missing_edge_orientation(self):
      embedding = nx.PlanarEmbedding({1: {2: {}}, 2: {1: {}}})
      with pytest.raises(nx.NetworkXException):
          # Invalid structure because the orientation of the edge was not set
          embedding.check_structure()
  
imports: import pytest
  import networkx
  from networkx.algorithms.planarity import check_planarity_recursive, get_counterexample, get_counterexample_recursive
label_desc: Use image node_id 4 for calling the TestPlanarEmbeddingClass obj's underlying member method code with example usage: obj.test_missing_edge_orientation() without return types