old_contents: import datetime
  import unittest
  
  from duka.core.utils import find_sunday, find_dst_begin, find_dst_end, is_dst
  
  
  class TestFindSunday(unittest.TestCase):
      def test_find_8_march_2015(self):
          res = find_sunday(2015, 3, 2)
          self.assertEqual(res.day, 8)
  
      def test_find_9_march_2014(self):
          res = find_sunday(2014, 3, 2)
          self.assertEqual(res.day, 9)
  
      def test_find_13_march_2016(self):
          res = find_sunday(2016, 3, 2)
          self.assertEqual(res.day, 13)
  
      def test_find_1_november_2015(self):
          res = find_sunday(2015, 11, 1)
          self.assertEqual(res.day, 1)
  
      def test_find_2_november_2014(self):
          res = find_sunday(2014, 11, 1)
          self.assertEqual(res.day, 2)
  
      def test_find_6_november_2016(self):
          res = find_sunday(2016, 11, 1)
          self.assertEqual(res.day, 6)
  
      def test_dst_2015(self):
          start = find_dst_begin(2015)
          end = find_dst_end(2015)
          self.assertEqual(start.day, 8)
          self.assertEqual(start.month, 3)
          self.assertEqual(end.day, 1)
          self.assertEqual(end.month, 11)
  
      def test_is_dst(self):
          day = datetime.datetime(2015, 4, 5)
          self.assertTrue(is_dst(day))
  
      def test_is_not_dst(self):
          day = datetime.datetime(2015, 1, 1)
          self.assertFalse(is_dst(day))
  
      def test_day_change_is_dst(self):
          day = datetime.datetime(2015, 3, 8)
          self.assertTrue(is_dst(day))
  
      def test_day_change_back_is_not_dst(self):
          day = datetime.datetime(2015, 11, 1)
          self.assertFalse(is_dst(day))
  
new_contents: import datetime
  import unittest
  
  from duka.core.utils import find_sunday, find_dst_begin, find_dst_end, is_dst
  
  
  class TestFindSunday(unittest.TestCase):
      def test_find_8_march_2015(self):
          res = find_sunday(2015, 3, 2)
          self.assertEqual(res.day, 8)
  
      def test_find_9_march_2014(self):
          res = find_sunday(2014, 3, 2)
          self.assertEqual(res.day, 9)
  
      def test_find_13_march_2016(self):
          res = find_sunday(2016, 3, 2)
          self.assertEqual(res.day, 13)
  
      def test_find_1_november_2015(self):
          res = find_sunday(2015, 11, 1)
          self.assertEqual(res.day, 1)
  
      def test_find_2_november_2014(self):
          res = find_sunday(2014, 11, 1)
          self.assertEqual(res.day, 2)
  
      def test_find_6_november_2016(self):
          res = find_sunday(2016, 11, 1)
          self.assertEqual(res.day, 6)
  
      def test_dst_2015(self):
          start = find_dst_begin(2015)
          end = find_dst_end(2015)
          self.assertEqual(start.day, 8)
          self.assertEqual(start.month, 3)
          self.assertEqual(end.day, 1)
          self.assertEqual(end.month, 11)
  
      def test_is_dst(self):
          day = datetime.datetime(2015, 4, 5)
          self.assertTrue(is_dst(day))
  
      def test_is_not_dst(self):
          day = datetime.datetime(2015, 1, 1)
          self.assertFalse(is_dst(day))
  
      def test_day_change_is_dst(self):
          day = datetime.datetime(2015, 3, 8)
          self.assertTrue(is_dst(day))
  
      def test_day_change_back_is_not_dst(self):
          day = datetime.datetime(2015, 11, 1)
          self.assertFalse(is_dst(day))
  
      def test_is_dst(self):
          day = datetime.datetime(2013, 11, 3)
          self.assertFalse(is_dst(day))
  
subject: add test