text: import unittest
  from .. import second_focal_plane
  
  
  class Tests(unittest.TestCase):
  
      def test_simple_focal_plane(self):
          print("Testing second focal plane.");
          np1 = [38, 51, 44];
          expected_outcome = [276.71179351444425, 57.32650724684216, 131.61502732561564];
          np2 = second_focal_plane.find_aux_plane(np1[0], np1[1], np1[2]);
          self.assertEqual(np2, expected_outcome, 'Wrong focal plane');
  
  
  if __name__ == '__main__':
      unittest.main()
  