def test_12_00_00_AM(self):
input = "12:00:00AM"
output = to_24(input)
expected = "00:00:00"
self.assertEqual(output, expected)
def test_11_45_21_AM(self):
input = "11:45:21PM"
output = to_24(input)
expected = "23:45:21"
self.assertEqual(output, expected)
def test_09_27_56_PM(self):
input = "09:27:56PM"
output = to_24(input)
expected = "21:27:56"
self.assertEqual(output, expected)
def test_11_59_37_AM(self):
input = "11:59:37AM"
output = to_24(input)
expected = "11:59:37"
self.assertEqual(output, expected)
def test_05_39_02_AM(self):
input = "05:39:02AM"
output = to_24(input)
expected = "05:39:02"
self.assertEqual(output, expected)