new_contents: import unittest
  
  from flatlib import angle
  
  
  class AngleTests(unittest.TestCase):
  
      def setUp(self):
          pass
  
      def test_norm(self):
          """Tests angle normalizations."""
          self.assertEqual(angle.norm(0), 0)
          self.assertEqual(angle.norm(360), 0)
          self.assertEqual(angle.norm(361), 1)
          self.assertEqual(angle.norm(-1), 359)
  
      def test_znorm(self):
          """Tests angle z-normalizations."""
          self.assertEqual(angle.znorm(0), 0)
          self.assertEqual(angle.znorm(90), 90)
          self.assertEqual(angle.znorm(180), 180)
          self.assertEqual(angle.znorm(181), -179)
          self.assertEqual(angle.znorm(270), -90)
  
      def test_distances(self):
          """Tests distances (counter-clockwise)"""
          self.assertEqual(angle.distance(0, 0), 0)
          self.assertEqual(angle.distance(0, 90), 90)
          self.assertEqual(angle.distance(0, 180), 180)
          self.assertEqual(angle.distance(0, -90), 270)
          self.assertEqual(angle.distance(0, -180), 180)
  
      def test_closest_distances(self):
          """Tests closest distances between two angles."""
          self.assertEqual(angle.closestdistance(0, 0), 0)
          self.assertEqual(angle.closestdistance(0, 90), 90)
          self.assertEqual(angle.closestdistance(0, 180), 180)
          self.assertEqual(angle.closestdistance(0, 270), -90)
          self.assertEqual(angle.closestdistance(0, 359), -1)
  
subject: Create tests for basic angle computations