def test_equal_2(self):
     self.assertEqual(positive_sum([1, -2, 3, 4, 5]), 13)
 def test_equal_1(self):
     self.assertEqual(positive_sum([1, 2, 3, 4, 5]), 15)
 def test_equal_4(self):
     self.assertEqual(positive_sum([]), 0)
 def test_equal_5(self):
     self.assertEqual(positive_sum([-1, -2, -3, -4, -5]), 0)
 def test_equal_3(self):
     self.assertEqual(positive_sum([-1, 2, 3, 4, -5]), 9)