text: # pylint: disable=no-self-use
  from unittest import TestCase
  
  import random
  import math
  
  from numpy import pi
  from numpy.testing import assert_almost_equal
  
  import EMpy.utils as U
  
  
  class UtilsTest(TestCase):
  
      def test_deg2rad(self):
          # TODO use hypothesis
          x = -2 * pi + 4 * pi * random.random()
          assert_almost_equal(x, U.deg2rad(U.rad2deg(x)))
  
      def test_norm(self):
          self.assertEqual(U.norm([1, 0, 0]), 1)
          self.assertEqual(U.norm([0, 1, 0]), 1)
          self.assertEqual(U.norm([0, 0, 1]), 1)
          assert_almost_equal(U.norm([1, 0, 1]), math.sqrt(2))
  