def test_largest_sum_mix(self):
input = [1, 5, -100, 4, 7]
result = largest_sum(input)
expected = 11
self.assertEqual(expected, result)
def test_largest_empty(self):
input = []
result = largest_sum(input)
expected = 0
self.assertEqual(expected, result)
def test_largest_sum_all_pos(self):
input = [1, 5, 8, 4, 7]
result = largest_sum(input)
expected = 25
self.assertEqual(expected, result)
def test_largest_sum_neg(self):
input = [-1, -3, -4]
result = largest_sum(input)
expected = -1
self.assertEqual(expected, result)