code: def test_face_encodings(self):
      img = api.load_image_file(
          os.path.join(
              os.path.dirname(__file__), "test_images", "obama.jpg"
          )
      )
      encodings = api.face_encodings(img)
  
      self.assertEqual(len(encodings), 1)
      self.assertEqual(len(encodings[0]), 128)
  
imports: import unittest
  import os
  import numpy
  from click.testing import CliRunner
  from face_recognition import api
  from face_recognition import face_recognition_cli
  from face_recognition import face_detection_cli
label_desc: Use image node_id 15 for calling the Test_face_recognition obj's underlying member method code with example usage: obj.test_face_encodings() without return types