code: def test_successful_face_traversal(self):
      embedding = nx.PlanarEmbedding()
      embedding.add_half_edge(1, 2)
      embedding.add_half_edge(2, 1)
      face = embedding.traverse_face(1, 2)
      assert face == [1, 2]
  
imports: import pytest
  import networkx
  from networkx.algorithms.planarity import check_planarity_recursive, get_counterexample, get_counterexample_recursive
label_desc: Use image node_id 10 for calling the TestPlanarEmbeddingClass obj's underlying member method code with example usage: obj.test_successful_face_traversal() without return types