def test_for_sum(self):
     self.assertEqual(14,solution.f_sum(1241231))
 def test_for_sum(self):
     self.assertEqual(14, solution.f_sum(1241231))
 def test_negative_number(self):
     self.assertEqual(4,solution.f_sum(--4000))
 def test_negative_number(self):
     self.assertEqual(4, solution.f_sum(--4000))