text: import unittest
  
  from lessons.prefix_sums.count_div import solution
  
  
  class TestCountDiv(unittest.TestCase):
  
      def test_basic_case(self):
          self.assertEqual(solution(6, 11, 2),    3)
          self.assertEqual(solution(11, 345, 17), 20)
  
  
  if __name__ == '__main__':
      unittest.main()
  