def test_serial_last_digit_even(self):
serial_odd = SerialNumber("IPZCV1")
serial_even = SerialNumber("DS50L8")
serial_odd_2 = SerialNumber("IPZC1V")
serial_even_2 = SerialNumber("DS508L")
assert serial_even.last_even()
assert serial_even_2.last_even()
assert not serial_odd.last_even()
assert not serial_odd_2.last_even()
def test_serial_has_vowel(self):
serial_yes = SerialNumber("IPZCV0")
serial_no = SerialNumber("DS50L8")
assert serial_yes.has_vowel()
assert not serial_no.has_vowel()
