old_contents: import unittest
  
  from aids.sorting_and_searching.mergesort import mergesort
  
  class MergesortTestCase(unittest.TestCase):
      '''
      Unit tests for mergesort
      '''
  
      def setUp(self):
          self.example_1 = [18,5,3,1,19,6,0,7,4,2,5]
  
      def test_mergesort(self):
          result = mergesort(self.example_1)
          self.assertEqual(result,[0,1,2,3,4,5,5,6,7,18,19])
          
      def tearDown(self):
          pass
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  
  from aids.sorting_and_searching.mergesort import mergesort, merge
  
  class MergesortTestCase(unittest.TestCase):
      '''
      Unit tests for mergesort
      '''
  
      def setUp(self):
          self.example_1 = [18,5,3,1,19,6,0,7,4,2,5]
          self.example_2 = [2,4,6,8,10]
          self.example_3 = [3,5,7,9]
  
      def test_mergesort(self):
          result = mergesort(self.example_1)
          self.assertEqual(result,[0,1,2,3,4,5,5,6,7,18,19])
          
      def test_merge(self):
          result = merge(self.example_2, self.example_3)
          self.assertEqual(result,[2,3,4,5,6,7,8,9,10])
          
      def tearDown(self):
          pass
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Update test_mergesort.py