text: class MissingNumberTest(TestCase):
      """docstring for MissingNumberTest"""
  
      def test_empty_list(self):
          self.assertEqual(0, find_missing([], []),
                           msg='should return 0 for empty list')
  
      def test_same_entries(self):
          list1 = find_missing([2], [2])
          list2 = find_missing([4], [4])
          list3 = find_missing([7], [7])
          self.assertListEqual([0, 0, 0],
                               [list1, list2, list3],
                               msg='should return 0 for lists with the same entries')
  
      def test_missing_entries(self):
          list1 = find_missing([1, 2], [1, 2, 5])
          list2 = find_missing([4, 6, 8], [4, 6, 8, 10])
          list3 = find_missing([5, 4, 7, 6, 11, 66], [5, 4, 1, 7, 6, 11, 66])
          self.assertListEqual([5, 10, 1],
                               [list1, list2, list3],
                               msg='should return the missing number for lists with similar entries and a missing number')
  