def test_summing(self):
    self.assertEqual(summing([]), 0)
    self.assertEqual(summing([3]), 3)
    self.assertEqual(summing([1, 1, 1, 1, 1]), 5)
    self.assertEqual(summing([1, (- 1)]), 0)
    self.assertEqual(summing([(- 2), (- 2)]), (- 4))
def test_summing(self):
    self.assertEqual(summing([]), 0)
    self.assertEqual(summing([3]), 3)
    self.assertEqual(summing([1, 1, 1, 1, 1]), 5)
    self.assertEqual(summing([1, (- 1)]), 0)
    self.assertEqual(summing([(- 2), (- 2)]), (- 4))