class RegressionTest(unittest.TestCase):
    def testNulNetmask(self):
        ip = timeout(IPy.IP, ["0.0.0.0/0.0.0.0"], timeout_duration=0.250, default=None)
        if ip:
            text = str(ip)
        else:
            text = "*TIMEOUT*"
        self.assertEqual(text, "0.0.0.0/0")

    def testNonZeroType(self):
        ip = IPy.IP("0.0.0.0/0")
        self.assertEqual(bool(ip), True)

    def testPrivate169(self):
        """
        RFC 3330 indicates that 169.254.0.0/16 addresses are private.
        They are automatically configured for links in the absence of other
        information and should not be used on the internet
        """
        self.assertEqual(IPy.IP("169.254.191.164").iptype(), "PRIVATE")

    def testCheckAddrPrefixlenOn(self):
        self.assertEqual(len(IPy.IP('192.168.0.0/24')), 256)
        self.assertRaises(ValueError, IPy.IP, '192.168.1.0/42')
        self.assertRaises(ValueError, IPy.IP, '172.30.1.0/22')

    def testCheckAddrPrefixlenOff(self):
        old = IPy.check_addr_prefixlen
        IPy.check_addr_prefixlen = False
        try:
            self.assertEqual(len(IPy.IP('192.168.0.0/24')), 256)
            self.assertRaises(ValueError, IPy.IP, '192.168.1.0/42')
            self.assertEqual(len(IPy.IP('172.30.1.0/22')), 1024)
        finally:
            IPy.check_addr_prefixlen = old