def validate_and_normalize_mac(address):
"""Validate a MAC address and return normalized form.
Checks whether the supplied MAC address is formally correct and
normalize it to all lower case.
:param address: MAC address to be validated and normalized.
:returns: Normalized and validated MAC address.
:raises: InvalidMAC If the MAC address is not valid.
"""
if not netutils.is_valid_mac(address):
raise exception.InvalidMAC(mac=address)
return address.lower()
def test_InvalidMAC(self):
self.assertRaises(exception.InvalidMAC,
lambda: self.raise_(exception.InvalidMAC()))