import unittest
from test import support
from test.support import import_helper
import builtins
import contextlib
import copy
import enum
import io
import os
import pickle
import sys
import weakref
from unittest import mock

py_uuid = import_helper.import_fresh_module('uuid', blocked=['_uuid'])
c_uuid = import_helper.import_fresh_module('uuid', fresh=['_uuid'])

def importable(name):
    try:
        __import__(name)
        return True
    except ModuleNotFoundError:
        return False


def mock_get_command_stdout(data):
    def get_command_stdout(command, args):
        return io.BytesIO(data.encode())
    return get_command_stdout


class BaseTestUUID:
    uuid = None

    def test_safe_uuid_enum(self):
        class CheckedSafeUUID(enum.Enum):
            safe = 0
            unsafe = -1
            unknown = None
        enum._test_simple_enum(CheckedSafeUUID, py_uuid.SafeUUID)

    def test_UUID(self):
        equal = self.assertEqual
        ascending = []
        for (string, curly, hex, bytes, bytes_le, fields, integer, urn,
             time, clock_seq, variant, version) in [
            ('00000000-0000-0000-0000-000000000000',
             '{00000000-0000-0000-0000-000000000000}',
             '00000000000000000000000000000000',
             b'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0',
             b'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0',
             (0, 0, 0, 0, 0, 0),
             0,
             'urn:uuid:00000000-0000-0000-0000-000000000000',
             0, 0, self.uuid.RESERVED_NCS, None),
            ('00010203-0405-0607-0809-0a0b0c0d0e0f',
             '{00010203-0405-0607-0809-0a0b0c0d0e0f}',
             '000102030405060708090a0b0c0d0e0f',
             b'\0\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\x0d\x0e\x0f',
             b'\x03\x02\x01\0\x05\x04\x07\x06\x08\t\n\x0b\x0c\x0d\x0e\x0f',
             (0x00010203, 0x0405, 0x0607, 8, 9, 0x0a0b0c0d0e0f),
             0x000102030405060708090a0b0c0d0e0f,
             'urn:uuid:00010203-0405-0607-0809-0a0b0c0d0e0f',
             0x607040500010203, 0x809, self.uuid.RESERVED_NCS, None),
            ('02d9e6d5-9467-382e-8f9b-9300a64ac3cd',
             '{02d9e6d5-9467-382e-8f9b-9300a64ac3cd}',
             '02d9e6d59467382e8f9b9300a64ac3cd',
             b'\x02\xd9\xe6\xd5\x94\x67\x38\x2e\x8f\x9b\x93\x00\xa6\x4a\xc3\xcd',
             b'\xd5\xe6\xd9\x02\x67\x94\x2e\x38\x8f\x9b\x93\x00\xa6\x4a\xc3\xcd',
             (0x02d9e6d5, 0x9467, 0x382e, 0x8f, 0x9b, 0x9300a64ac3cd),
             0x02d9e6d59467382e8f9b9300a64ac3cd,
             'urn:uuid:02d9e6d5-9467-382e-8f9b-9300a64ac3cd',
             0x82e946702d9e6d5, 0xf9b, self.uuid.RFC_4122, 3),
            ('12345678-1234-5678-1234-567812345678',
             '{12345678-1234-5678-1234-567812345678}',
             '12345678123456781234567812345678',
             b'\x12\x34\x56\x78'*4,
             b'\x78\x56\x34\x12\x34\x12\x78\x56\x12\x34\x56\x78\x12\x34\x56\x78',
             (0x12345678, 0x1234, 0x5678, 0x12, 0x34, 0x567812345678),
             0x12345678123456781234567812345678,
             'urn:uuid:12345678-1234-5678-1234-567812345678',
             0x678123412345678, 0x1234, self.uuid.RESERVED_NCS, None),
            ('6ba7b810-9dad-11d1-80b4-00c04fd430c8',
             '{6ba7b810-9dad-11d1-80b4-00c04fd430c8}',
             '6ba7b8109dad11d180b400c04fd430c8',
             b'\x6b\xa7\xb8\x10\x9d\xad\x11\xd1\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             b'\x10\xb8\xa7\x6b\xad\x9d\xd1\x11\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             (0x6ba7b810, 0x9dad, 0x11d1, 0x80, 0xb4, 0x00c04fd430c8),
             0x6ba7b8109dad11d180b400c04fd430c8,
             'urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8',
             0x1d19dad6ba7b810, 0xb4, self.uuid.RFC_4122, 1),
            ('6ba7b811-9dad-11d1-80b4-00c04fd430c8',
             '{6ba7b811-9dad-11d1-80b4-00c04fd430c8}',
             '6ba7b8119dad11d180b400c04fd430c8',
             b'\x6b\xa7\xb8\x11\x9d\xad\x11\xd1\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             b'\x11\xb8\xa7\x6b\xad\x9d\xd1\x11\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             (0x6ba7b811, 0x9dad, 0x11d1, 0x80, 0xb4, 0x00c04fd430c8),
             0x6ba7b8119dad11d180b400c04fd430c8,
             'urn:uuid:6ba7b811-9dad-11d1-80b4-00c04fd430c8',
             0x1d19dad6ba7b811, 0xb4, self.uuid.RFC_4122, 1),
            ('6ba7b812-9dad-11d1-80b4-00c04fd430c8',
             '{6ba7b812-9dad-11d1-80b4-00c04fd430c8}',
             '6ba7b8129dad11d180b400c04fd430c8',
             b'\x6b\xa7\xb8\x12\x9d\xad\x11\xd1\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             b'\x12\xb8\xa7\x6b\xad\x9d\xd1\x11\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             (0x6ba7b812, 0x9dad, 0x11d1, 0x80, 0xb4, 0x00c04fd430c8),
             0x6ba7b8129dad11d180b400c04fd430c8,
             'urn:uuid:6ba7b812-9dad-11d1-80b4-00c04fd430c8',
             0x1d19dad6ba7b812, 0xb4, self.uuid.RFC_4122, 1),
            ('6ba7b814-9dad-11d1-80b4-00c04fd430c8',
             '{6ba7b814-9dad-11d1-80b4-00c04fd430c8}',
             '6ba7b8149dad11d180b400c04fd430c8',
             b'\x6b\xa7\xb8\x14\x9d\xad\x11\xd1\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             b'\x14\xb8\xa7\x6b\xad\x9d\xd1\x11\x80\xb4\x00\xc0\x4f\xd4\x30\xc8',
             (0x6ba7b814, 0x9dad, 0x11d1, 0x80, 0xb4, 0x00c04fd430c8),
             0x6ba7b8149dad11d180b400c04fd430c8,
             'urn:uuid:6ba7b814-9dad-11d1-80b4-00c04fd430c8',
             0x1d19dad6ba7b814, 0xb4, self.uuid.RFC_4122, 1),
            ('7d444840-9dc0-11d1-b245-5ffdce74fad2',
             '{7d444840-9dc0-11d1-b245-5ffdce74fad2}',
             '7d4448409dc011d1b2455ffdce74fad2',
             b'\x7d\x44\x48\x40\x9d\xc0\x11\xd1\xb2\x45\x5f\xfd\xce\x74\xfa\xd2',
             b'\x40\x48\x44\x7d\xc0\x9d\xd1\x11\xb2\x45\x5f\xfd\xce\x74\xfa\xd2',
             (0x7d444840, 0x9dc0, 0x11d1, 0xb2, 0x45, 0x5ffdce74fad2),
             0x7d4448409dc011d1b2455ffdce74fad2,
             'urn:uuid:7d444840-9dc0-11d1-b245-5ffdce74fad2',
             0x1d19dc07d444840, 0x3245, self.uuid.RFC_4122, 1),
            ('e902893a-9d22-3c7e-a7b8-d6e313b71d9f',
             '{e902893a-9d22-3c7e-a7b8-d6e313b71d9f}',
             'e902893a9d223c7ea7b8d6e313b71d9f',
             b'\xe9\x02\x89\x3a\x9d\x22\x3c\x7e\xa7\xb8\xd6\xe3\x13\xb7\x1d\x9f',
             b'\x3a\x89\x02\xe9\x22\x9d\x7e\x3c\xa7\xb8\xd6\xe3\x13\xb7\x1d\x9f',
             (0xe902893a, 0x9d22, 0x3c7e, 0xa7, 0xb8, 0xd6e313b71d9f),
             0xe902893a9d223c7ea7b8d6e313b71d9f,
             'urn:uuid:e902893a-9d22-3c7e-a7b8-d6e313b71d9f',
             0xc7e9d22e902893a, 0x27b8, self.uuid.RFC_4122, 3),
            ('eb424026-6f54-4ef8-a4d0-bb658a1fc6cf',
             '{eb424026-6f54-4ef8-a4d0-bb658a1fc6cf}',
             'eb4240266f544ef8a4d0bb658a1fc6cf',
             b'\xeb\x42\x40\x26\x6f\x54\x4e\xf8\xa4\xd0\xbb\x65\x8a\x1f\xc6\xcf',
             b'\x26\x40\x42\xeb\x54\x6f\xf8\x4e\xa4\xd0\xbb\x65\x8a\x1f\xc6\xcf',
             (0xeb424026, 0x6f54, 0x4ef8, 0xa4, 0xd0, 0xbb658a1fc6cf),
             0xeb4240266f544ef8a4d0bb658a1fc6cf,
             'urn:uuid:eb424026-6f54-4ef8-a4d0-bb658a1fc6cf',
             0xef86f54eb424026, 0x24d0, self.uuid.RFC_4122, 4),
            ('f81d4fae-7dec-11d0-a765-00a0c91e6bf6',
             '{f81d4fae-7dec-11d0-a765-00a0c91e6bf6}',
             'f81d4fae7dec11d0a76500a0c91e6bf6',
             b'\xf8\x1d\x4f\xae\x7d\xec\x11\xd0\xa7\x65\x00\xa0\xc9\x1e\x6b\xf6',
             b'\xae\x4f\x1d\xf8\xec\x7d\xd0\x11\xa7\x65\x00\xa0\xc9\x1e\x6b\xf6',
             (0xf81d4fae, 0x7dec, 0x11d0, 0xa7, 0x65, 0x00a0c91e6bf6),
             0xf81d4fae7dec11d0a76500a0c91e6bf6,
             'urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6',
             0x1d07decf81d4fae, 0x2765, self.uuid.RFC_4122, 1),
            ('fffefdfc-fffe-fffe-fffe-fffefdfcfbfa',
             '{fffefdfc-fffe-fffe-fffe-fffefdfcfbfa}',
             'fffefdfcfffefffefffefffefdfcfbfa',
             b'\xff\xfe\xfd\xfc\xff\xfe\xff\xfe\xff\xfe\xff\xfe\xfd\xfc\xfb\xfa',
             b'\xfc\xfd\xfe\xff\xfe\xff\xfe\xff\xff\xfe\xff\xfe\xfd\xfc\xfb\xfa',
             (0xfffefdfc, 0xfffe, 0xfffe, 0xff, 0xfe, 0xfffefdfcfbfa),
             0xfffefdfcfffefffefffefffefdfcfbfa,
             'urn:uuid:fffefdfc-fffe-fffe-fffe-fffefdfcfbfa',
             0xffefffefffefdfc, 0x3ffe, self.uuid.RESERVED_FUTURE, None),
            ('ffffffff-ffff-ffff-ffff-ffffffffffff',
             '{ffffffff-ffff-ffff-ffff-ffffffffffff}',
             'ffffffffffffffffffffffffffffffff',
             b'\xff'*16,
             b'\xff'*16,
             (0xffffffff, 0xffff, 0xffff, 0xff, 0xff, 0xffffffffffff),
             0xffffffffffffffffffffffffffffffff,
             'urn:uuid:ffffffff-ffff-ffff-ffff-ffffffffffff',
             0xfffffffffffffff, 0x3fff, self.uuid.RESERVED_FUTURE, None),
            ]:
            equivalents = []
            # Construct each UUID in several different ways.
            for u in [self.uuid.UUID(string), self.uuid.UUID(curly), self.uuid.UUID(hex),
                      self.uuid.UUID(bytes=bytes), self.uuid.UUID(bytes_le=bytes_le),
                      self.uuid.UUID(fields=fields), self.uuid.UUID(int=integer),
                      self.uuid.UUID(urn)]:
                # Test all conversions and properties of the UUID object.
                equal(str(u), string)
                equal(int(u), integer)
                equal(u.bytes, bytes)
                equal(u.bytes_le, bytes_le)
                equal(u.fields, fields)
                equal(u.time_low, fields[0])
                equal(u.time_mid, fields[1])
                equal(u.time_hi_version, fields[2])
                equal(u.clock_seq_hi_variant, fields[3])
                equal(u.clock_seq_low, fields[4])
                equal(u.node, fields[5])
                equal(u.hex, hex)
                equal(u.int, integer)
                equal(u.urn, urn)
                equal(u.time, time)
                equal(u.clock_seq, clock_seq)
                equal(u.variant, variant)
                equal(u.version, version)
                equivalents.append(u)

            # Different construction methods should give the same UUID.
            for u in equivalents:
                for v in equivalents:
                    equal(u, v)

            # Bug 7380: "bytes" and "bytes_le" should give the same type.
            equal(type(u.bytes), builtins.bytes)
            equal(type(u.bytes_le), builtins.bytes)

            ascending.append(u)

        # Test comparison of UUIDs.
        for i in range(len(ascending)):
            for j in range(len(ascending)):
                equal(i < j, ascending[i] < ascending[j])
                equal(i <= j, ascending[i] <= ascending[j])
                equal(i == j, ascending[i] == ascending[j])
                equal(i > j, ascending[i] > ascending[j])
                equal(i >= j, ascending[i] >= ascending[j])
                equal(i != j, ascending[i] != ascending[j])

        # Test sorting of UUIDs (above list is in ascending order).
        resorted = ascending[:]
        resorted.reverse()
        resorted.sort()
        equal(ascending, resorted)

    def test_exceptions(self):
        badvalue = lambda f: self.assertRaises(ValueError, f)
        badtype = lambda f: self.assertRaises(TypeError, f)

        # Badly formed hex strings.
        badvalue(lambda: self.uuid.UUID(''))
        badvalue(lambda: self.uuid.UUID('abc'))
        badvalue(lambda: self.uuid.UUID('1234567812345678123456781234567'))
        badvalue(lambda: self.uuid.UUID('123456781234567812345678123456789'))
        badvalue(lambda: self.uuid.UUID('123456781234567812345678z2345678'))

        # Badly formed bytes.
        badvalue(lambda: self.uuid.UUID(bytes='abc'))
        badvalue(lambda: self.uuid.UUID(bytes='\0'*15))
        badvalue(lambda: self.uuid.UUID(bytes='\0'*17))

        # Badly formed bytes_le.
        badvalue(lambda: self.uuid.UUID(bytes_le='abc'))
        badvalue(lambda: self.uuid.UUID(bytes_le='\0'*15))
        badvalue(lambda: self.uuid.UUID(bytes_le='\0'*17))

        # Badly formed fields.
        badvalue(lambda: self.uuid.UUID(fields=(1,)))
        badvalue(lambda: self.uuid.UUID(fields=(1, 2, 3, 4, 5)))
        badvalue(lambda: self.uuid.UUID(fields=(1, 2, 3, 4, 5, 6, 7)))

        # Field values out of range.
        badvalue(lambda: self.uuid.UUID(fields=(-1, 0, 0, 0, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0x100000000, 0, 0, 0, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, -1, 0, 0, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0x10000, 0, 0, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, -1, 0, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, 0x10000, 0, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, 0, -1, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, 0, 0x100, 0, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, 0, 0, -1, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, 0, 0, 0x100, 0)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, 0, 0, 0, -1)))
        badvalue(lambda: self.uuid.UUID(fields=(0, 0, 0, 0, 0, 0x1000000000000)))

        # Version number out of range.
        badvalue(lambda: self.uuid.UUID('00'*16, version=0))
        badvalue(lambda: self.uuid.UUID('00'*16, version=6))

        # Integer value out of range.
        badvalue(lambda: self.uuid.UUID(int=-1))
        badvalue(lambda: self.uuid.UUID(int=1<<128))

        # Must supply exactly one of hex, bytes, fields, int.
        h, b, f, i = '00'*16, b'\0'*16, (0, 0, 0, 0, 0, 0), 0
        self.uuid.UUID(h)
        self.uuid.UUID(hex=h)
        self.uuid.UUID(bytes=b)
        self.uuid.UUID(bytes_le=b)
        self.uuid.UUID(fields=f)
        self.uuid.UUID(int=i)

        # Wrong number of arguments (positional).
        badtype(lambda: self.uuid.UUID())
        badtype(lambda: self.uuid.UUID(h, b))
        badtype(lambda: self.uuid.UUID(h, b, b))
        badtype(lambda: self.uuid.UUID(h, b, b, f))
        badtype(lambda: self.uuid.UUID(h, b, b, f, i))

        # Duplicate arguments.
        for hh in [[], [('hex', h)]]:
            for bb in [[], [('bytes', b)]]:
                for bble in [[], [('bytes_le', b)]]:
                    for ii in [[], [('int', i)]]:
                        for ff in [[], [('fields', f)]]:
                            args = dict(hh + bb + bble + ii + ff)
                            if len(args) != 0:
                                badtype(lambda: self.uuid.UUID(h, **args))
                            if len(args) != 1:
                                badtype(lambda: self.uuid.UUID(**args))

        # Immutability.
        u = self.uuid.UUID(h)
        badtype(lambda: setattr(u, 'hex', h))
        badtype(lambda: setattr(u, 'bytes', b))
        badtype(lambda: setattr(u, 'bytes_le', b))
        badtype(lambda: setattr(u, 'fields', f))
        badtype(lambda: setattr(u, 'int', i))
        badtype(lambda: setattr(u, 'time_low', 0))
        badtype(lambda: setattr(u, 'time_mid', 0))
        badtype(lambda: setattr(u, 'time_hi_version', 0))
        badtype(lambda: setattr(u, 'time_hi_version', 0))
        badtype(lambda: setattr(u, 'clock_seq_hi_variant', 0))
        badtype(lambda: setattr(u, 'clock_seq_low', 0))
        badtype(lambda: setattr(u, 'node', 0))

        # Comparison with a non-UUID object
        badtype(lambda: u < object())
        badtype(lambda: u > object())

    def test_getnode(self):
        node1 = self.uuid.getnode()
        self.assertTrue(0 < node1 < (1 << 48), '%012x' % node1)

        # Test it again to ensure consistency.
        node2 = self.uuid.getnode()
        self.assertEqual(node1, node2, '%012x != %012x' % (node1, node2))

    def test_pickle_roundtrip(self):
        def check(actual, expected):
            self.assertEqual(actual, expected)
            self.assertEqual(actual.is_safe, expected.is_safe)

        with support.swap_item(sys.modules, 'uuid', self.uuid):
            for is_safe in self.uuid.SafeUUID:
                u = self.uuid.UUID('d82579ce6642a0de7ddf490a7aec7aa5',
                                   is_safe=is_safe)
                check(copy.copy(u), u)
                check(copy.deepcopy(u), u)
                for proto in range(pickle.HIGHEST_PROTOCOL + 1):
                    with self.subTest(protocol=proto):
                        check(pickle.loads(pickle.dumps(u, proto)), u)

    def test_unpickle_previous_python_versions(self):
        def check(actual, expected):
            self.assertEqual(actual, expected)
            self.assertEqual(actual.is_safe, expected.is_safe)

        pickled_uuids = [
            # Python 2.7, protocol 0
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR(dS\'int\'\nL287307832597519156748809049798316161701L\nsb.',
            # Python 2.7, protocol 1
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR}U\x03intL287307832597519156748809049798316161701L\nsb.',
            # Python 2.7, protocol 2
            b'\x80\x02cuuid\nUUID\n)\x81}U\x03int\x8a\x11\xa5z\xecz\nI\xdf}'
            b'\xde\xa0Bf\xcey%\xd8\x00sb.',
            # Python 3.6, protocol 0
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR(dVint\nL287307832597519156748809049798316161701L\nsb.',
            # Python 3.6, protocol 1
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR}X\x03\x00\x00\x00intL287307832597519156748809049798316161701L'
            b'\nsb.',
            # Python 3.6, protocol 2
            b'\x80\x02cuuid\nUUID\n)\x81}X\x03\x00\x00\x00int\x8a\x11\xa5z\xec'
            b'z\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00sb.',
            # Python 3.6, protocol 3
            b'\x80\x03cuuid\nUUID\n)\x81}X\x03\x00\x00\x00int\x8a\x11\xa5z\xec'
            b'z\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00sb.',
            # Python 3.6, protocol 4
            b'\x80\x04\x95+\x00\x00\x00\x00\x00\x00\x00\x8c\x04uuid\x8c\x04UUI'
            b'D\x93)\x81}\x8c\x03int\x8a\x11\xa5z\xecz\nI\xdf}\xde\xa0Bf\xcey%'
            b'\xd8\x00sb.',
            # Python 3.7, protocol 0
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR(dVint\nL287307832597519156748809049798316161701L\nsVis_safe\n'
            b'cuuid\nSafeUUID\n(NtRsb.',
            # Python 3.7, protocol 1
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR}(X\x03\x00\x00\x00intL287307832597519156748809049798316161701'
            b'L\nX\x07\x00\x00\x00is_safecuuid\nSafeUUID\n(NtRub.',
            # Python 3.7, protocol 2
            b'\x80\x02cuuid\nUUID\n)\x81}(X\x03\x00\x00\x00int\x8a\x11\xa5z'
            b'\xecz\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00X\x07\x00\x00\x00is_safecuu'
            b'id\nSafeUUID\nN\x85Rub.',
            # Python 3.7, protocol 3
            b'\x80\x03cuuid\nUUID\n)\x81}(X\x03\x00\x00\x00int\x8a\x11\xa5z'
            b'\xecz\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00X\x07\x00\x00\x00is_safecuu'
            b'id\nSafeUUID\nN\x85Rub.',
            # Python 3.7, protocol 4
            b'\x80\x04\x95F\x00\x00\x00\x00\x00\x00\x00\x8c\x04uuid\x94\x8c'
            b'\x04UUID\x93)\x81}(\x8c\x03int\x8a\x11\xa5z\xecz\nI\xdf}\xde\xa0'
            b'Bf\xcey%\xd8\x00\x8c\x07is_safeh\x00\x8c\x08SafeUUID\x93N\x85Rub'
            b'.',
        ]
        pickled_uuids_safe = [
            # Python 3.7, protocol 0
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR(dVint\nL287307832597519156748809049798316161701L\nsVis_safe\n'
            b'cuuid\nSafeUUID\n(I0\ntRsb.',
            # Python 3.7, protocol 1
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR}(X\x03\x00\x00\x00intL287307832597519156748809049798316161701'
            b'L\nX\x07\x00\x00\x00is_safecuuid\nSafeUUID\n(K\x00tRub.',
            # Python 3.7, protocol 2
            b'\x80\x02cuuid\nUUID\n)\x81}(X\x03\x00\x00\x00int\x8a\x11\xa5z'
            b'\xecz\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00X\x07\x00\x00\x00is_safecuu'
            b'id\nSafeUUID\nK\x00\x85Rub.',
            # Python 3.7, protocol 3
            b'\x80\x03cuuid\nUUID\n)\x81}(X\x03\x00\x00\x00int\x8a\x11\xa5z'
            b'\xecz\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00X\x07\x00\x00\x00is_safecuu'
            b'id\nSafeUUID\nK\x00\x85Rub.',
            # Python 3.7, protocol 4
            b'\x80\x04\x95G\x00\x00\x00\x00\x00\x00\x00\x8c\x04uuid\x94\x8c'
            b'\x04UUID\x93)\x81}(\x8c\x03int\x8a\x11\xa5z\xecz\nI\xdf}\xde\xa0'
            b'Bf\xcey%\xd8\x00\x8c\x07is_safeh\x00\x8c\x08SafeUUID\x93K\x00'
            b'\x85Rub.',
        ]
        pickled_uuids_unsafe = [
            # Python 3.7, protocol 0
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR(dVint\nL287307832597519156748809049798316161701L\nsVis_safe\n'
            b'cuuid\nSafeUUID\n(I-1\ntRsb.',
            # Python 3.7, protocol 1
            b'ccopy_reg\n_reconstructor\n(cuuid\nUUID\nc__builtin__\nobject\nN'
            b'tR}(X\x03\x00\x00\x00intL287307832597519156748809049798316161701'
            b'L\nX\x07\x00\x00\x00is_safecuuid\nSafeUUID\n(J\xff\xff\xff\xfftR'
            b'ub.',
            # Python 3.7, protocol 2
            b'\x80\x02cuuid\nUUID\n)\x81}(X\x03\x00\x00\x00int\x8a\x11\xa5z'
            b'\xecz\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00X\x07\x00\x00\x00is_safecuu'
            b'id\nSafeUUID\nJ\xff\xff\xff\xff\x85Rub.',
            # Python 3.7, protocol 3
            b'\x80\x03cuuid\nUUID\n)\x81}(X\x03\x00\x00\x00int\x8a\x11\xa5z'
            b'\xecz\nI\xdf}\xde\xa0Bf\xcey%\xd8\x00X\x07\x00\x00\x00is_safecuu'
            b'id\nSafeUUID\nJ\xff\xff\xff\xff\x85Rub.',
            # Python 3.7, protocol 4
            b'\x80\x04\x95J\x00\x00\x00\x00\x00\x00\x00\x8c\x04uuid\x94\x8c'
            b'\x04UUID\x93)\x81}(\x8c\x03int\x8a\x11\xa5z\xecz\nI\xdf}\xde\xa0'
            b'Bf\xcey%\xd8\x00\x8c\x07is_safeh\x00\x8c\x08SafeUUID\x93J\xff'
            b'\xff\xff\xff\x85Rub.',
        ]

        u = self.uuid.UUID('d82579ce6642a0de7ddf490a7aec7aa5')
        u_safe = self.uuid.UUID('d82579ce6642a0de7ddf490a7aec7aa5',
                                is_safe=self.uuid.SafeUUID.safe)
        u_unsafe = self.uuid.UUID('d82579ce6642a0de7ddf490a7aec7aa5',
                                  is_safe=self.uuid.SafeUUID.unsafe)

        with support.swap_item(sys.modules, 'uuid', self.uuid):
            for pickled in pickled_uuids:
                # is_safe was added in 3.7.  When unpickling values from older
                # versions, is_safe will be missing, so it should be set to
                # SafeUUID.unknown.
                check(pickle.loads(pickled), u)
            for pickled in pickled_uuids_safe:
                check(pickle.loads(pickled), u_safe)
            for pickled in pickled_uuids_unsafe:
                check(pickle.loads(pickled), u_unsafe)

    # bpo-32502: UUID1 requires a 48-bit identifier, but hardware identifiers
    # need not necessarily be 48 bits (e.g., EUI-64).
    def test_uuid1_eui64(self):
        # Confirm that uuid.getnode ignores hardware addresses larger than 48
        # bits. Mock out each platform's *_getnode helper functions to return
        # something just larger than 48 bits to test. This will cause
        # uuid.getnode to fall back on uuid._random_getnode, which will
        # generate a valid value.
        too_large_getter = lambda: 1 << 48
        with mock.patch.multiple(
            self.uuid,
            _node=None,  # Ignore any cached node value.
            _GETTERS=[too_large_getter],
        ):
            node = self.uuid.getnode()
        self.assertTrue(0 < node < (1 << 48), '%012x' % node)

        # Confirm that uuid1 can use the generated node, i.e., the that
        # uuid.getnode fell back on uuid._random_getnode() rather than using
        # the value from too_large_getter above.
        try:
            self.uuid.uuid1(node=node)
        except ValueError:
            self.fail('uuid1 was given an invalid node ID')

    def test_uuid1(self):
        equal = self.assertEqual

        # Make sure uuid1() generates UUIDs that are actually version 1.
        for u in [self.uuid.uuid1() for i in range(10)]:
            equal(u.variant, self.uuid.RFC_4122)
            equal(u.version, 1)
            self.assertIn(u.is_safe, {self.uuid.SafeUUID.safe,
                                      self.uuid.SafeUUID.unsafe,
                                      self.uuid.SafeUUID.unknown})

        # Make sure the generated UUIDs are actually unique.
        uuids = {}
        for u in [self.uuid.uuid1() for i in range(1000)]:
            uuids[u] = 1
        equal(len(uuids.keys()), 1000)

        # Make sure the supplied node ID appears in the UUID.
        u = self.uuid.uuid1(0)
        equal(u.node, 0)
        u = self.uuid.uuid1(0x123456789abc)
        equal(u.node, 0x123456789abc)
        u = self.uuid.uuid1(0xffffffffffff)
        equal(u.node, 0xffffffffffff)

        # Make sure the supplied clock sequence appears in the UUID.
        u = self.uuid.uuid1(0x123456789abc, 0)
        equal(u.node, 0x123456789abc)
        equal(((u.clock_seq_hi_variant & 0x3f) << 8) | u.clock_seq_low, 0)
        u = self.uuid.uuid1(0x123456789abc, 0x1234)
        equal(u.node, 0x123456789abc)
        equal(((u.clock_seq_hi_variant & 0x3f) << 8) |
                         u.clock_seq_low, 0x1234)
        u = self.uuid.uuid1(0x123456789abc, 0x3fff)
        equal(u.node, 0x123456789abc)
        equal(((u.clock_seq_hi_variant & 0x3f) << 8) |
                         u.clock_seq_low, 0x3fff)

    # bpo-29925: On Mac OS X Tiger, self.uuid.uuid1().is_safe returns
    # self.uuid.SafeUUID.unknown
    @support.requires_mac_ver(10, 5)
    @unittest.skipUnless(os.name == 'posix', 'POSIX-only test')
    def test_uuid1_safe(self):
        if not self.uuid._has_uuid_generate_time_safe:
            self.skipTest('requires uuid_generate_time_safe(3)')

        u = self.uuid.uuid1()
        # uuid_generate_time_safe() may return 0 or -1 but what it returns is
        # dependent on the underlying platform support.  At least it cannot be
        # unknown (unless I suppose the platform is buggy).
        self.assertNotEqual(u.is_safe, self.uuid.SafeUUID.unknown)

    @contextlib.contextmanager
    def mock_generate_time_safe(self, safe_value):
        """
        Mock uuid._generate_time_safe() to return a given *safe_value*.
        """
        if os.name != 'posix':
            self.skipTest('POSIX-only test')
        self.uuid._load_system_functions()
        f = self.uuid._generate_time_safe
        if f is None:
            self.skipTest('need uuid._generate_time_safe')
        with mock.patch.object(self.uuid, '_generate_time_safe',
                               lambda: (f()[0], safe_value)):
            yield

    @unittest.skipUnless(os.name == 'posix', 'POSIX-only test')
    def test_uuid1_unknown(self):
        # Even if the platform has uuid_generate_time_safe(), let's mock it to
        # be uuid_generate_time() and ensure the safety is unknown.
        with self.mock_generate_time_safe(None):
            u = self.uuid.uuid1()
            self.assertEqual(u.is_safe, self.uuid.SafeUUID.unknown)

    @unittest.skipUnless(os.name == 'posix', 'POSIX-only test')
    def test_uuid1_is_safe(self):
        with self.mock_generate_time_safe(0):
            u = self.uuid.uuid1()
            self.assertEqual(u.is_safe, self.uuid.SafeUUID.safe)

    @unittest.skipUnless(os.name == 'posix', 'POSIX-only test')
    def test_uuid1_is_unsafe(self):
        with self.mock_generate_time_safe(-1):
            u = self.uuid.uuid1()
            self.assertEqual(u.is_safe, self.uuid.SafeUUID.unsafe)

    @unittest.skipUnless(os.name == 'posix', 'POSIX-only test')
    def test_uuid1_bogus_return_value(self):
        with self.mock_generate_time_safe(3):
            u = self.uuid.uuid1()
            self.assertEqual(u.is_safe, self.uuid.SafeUUID.unknown)

    def test_uuid1_time(self):
        with mock.patch.object(self.uuid, '_has_uuid_generate_time_safe', False), \
             mock.patch.object(self.uuid, '_generate_time_safe', None), \
             mock.patch.object(self.uuid, '_last_timestamp', None), \
             mock.patch.object(self.uuid, 'getnode', return_value=93328246233727), \
             mock.patch('time.time_ns', return_value=1545052026752910643), \
             mock.patch('random.getrandbits', return_value=5317): # guaranteed to be random
            u = self.uuid.uuid1()
            self.assertEqual(u, self.uuid.UUID('a7a55b92-01fc-11e9-94c5-54e1acf6da7f'))

        with mock.patch.object(self.uuid, '_has_uuid_generate_time_safe', False), \
             mock.patch.object(self.uuid, '_generate_time_safe', None), \
             mock.patch.object(self.uuid, '_last_timestamp', None), \
             mock.patch('time.time_ns', return_value=1545052026752910643):
            u = self.uuid.uuid1(node=93328246233727, clock_seq=5317)
            self.assertEqual(u, self.uuid.UUID('a7a55b92-01fc-11e9-94c5-54e1acf6da7f'))

    def test_uuid3(self):
        equal = self.assertEqual

        # Test some known version-3 UUIDs with name passed as a byte object
        for u, v in [(self.uuid.uuid3(self.uuid.NAMESPACE_DNS, b'python.org'),
                      '6fa459ea-ee8a-3ca4-894e-db77e160355e'),
                     (self.uuid.uuid3(self.uuid.NAMESPACE_URL, b'http://python.org/'),
                      '9fe8e8c4-aaa8-32a9-a55c-4535a88b748d'),
                     (self.uuid.uuid3(self.uuid.NAMESPACE_OID, b'1.3.6.1'),
                      'dd1a1cef-13d5-368a-ad82-eca71acd4cd1'),
                     (self.uuid.uuid3(self.uuid.NAMESPACE_X500, b'c=ca'),
                      '658d3002-db6b-3040-a1d1-8ddd7d189a4d'),
                    ]:
            equal(u.variant, self.uuid.RFC_4122)
            equal(u.version, 3)
            equal(u, self.uuid.UUID(v))
            equal(str(u), v)

        # Test some known version-3 UUIDs with name passed as a string
        for u, v in [(self.uuid.uuid3(self.uuid.NAMESPACE_DNS, 'python.org'),
                      '6fa459ea-ee8a-3ca4-894e-db77e160355e'),
                     (self.uuid.uuid3(self.uuid.NAMESPACE_URL, 'http://python.org/'),
                      '9fe8e8c4-aaa8-32a9-a55c-4535a88b748d'),
                     (self.uuid.uuid3(self.uuid.NAMESPACE_OID, '1.3.6.1'),
                      'dd1a1cef-13d5-368a-ad82-eca71acd4cd1'),
                     (self.uuid.uuid3(self.uuid.NAMESPACE_X500, 'c=ca'),
                      '658d3002-db6b-3040-a1d1-8ddd7d189a4d'),
                    ]:
            equal(u.variant, self.uuid.RFC_4122)
            equal(u.version, 3)
            equal(u, self.uuid.UUID(v))
            equal(str(u), v)

    def test_uuid4(self):
        equal = self.assertEqual

        # Make sure uuid4() generates UUIDs that are actually version 4.
        for u in [self.uuid.uuid4() for i in range(10)]:
            equal(u.variant, self.uuid.RFC_4122)
            equal(u.version, 4)

        # Make sure the generated UUIDs are actually unique.
        uuids = {}
        for u in [self.uuid.uuid4() for i in range(1000)]:
            uuids[u] = 1
        equal(len(uuids.keys()), 1000)

    def test_uuid5(self):
        equal = self.assertEqual

        # Test some known version-5 UUIDs with names given as byte objects
        for u, v in [(self.uuid.uuid5(self.uuid.NAMESPACE_DNS, b'python.org'),
                      '886313e1-3b8a-5372-9b90-0c9aee199e5d'),
                     (self.uuid.uuid5(self.uuid.NAMESPACE_URL, b'http://python.org/'),
                      '4c565f0d-3f5a-5890-b41b-20cf47701c5e'),
                     (self.uuid.uuid5(self.uuid.NAMESPACE_OID, b'1.3.6.1'),
                      '1447fa61-5277-5fef-a9b3-fbc6e44f4af3'),
                     (self.uuid.uuid5(self.uuid.NAMESPACE_X500, b'c=ca'),
                      'cc957dd1-a972-5349-98cd-874190002798'),
                    ]:
            equal(u.variant, self.uuid.RFC_4122)
            equal(u.version, 5)
            equal(u, self.uuid.UUID(v))
            equal(str(u), v)

        # Test some known version-5 UUIDs with names given as strings
        for u, v in [(self.uuid.uuid5(self.uuid.NAMESPACE_DNS, 'python.org'),
                      '886313e1-3b8a-5372-9b90-0c9aee199e5d'),
                     (self.uuid.uuid5(self.uuid.NAMESPACE_URL, 'http://python.org/'),
                      '4c565f0d-3f5a-5890-b41b-20cf47701c5e'),
                     (self.uuid.uuid5(self.uuid.NAMESPACE_OID, '1.3.6.1'),
                      '1447fa61-5277-5fef-a9b3-fbc6e44f4af3'),
                     (self.uuid.uuid5(self.uuid.NAMESPACE_X500, 'c=ca'),
                      'cc957dd1-a972-5349-98cd-874190002798'),
                    ]:
            equal(u.variant, self.uuid.RFC_4122)
            equal(u.version, 5)
            equal(u, self.uuid.UUID(v))
            equal(str(u), v)

    @support.requires_fork()
    def testIssue8621(self):
        # On at least some versions of OSX self.uuid.uuid4 generates
        # the same sequence of UUIDs in the parent and any
        # children started using fork.
        fds = os.pipe()
        pid = os.fork()
        if pid == 0:
            os.close(fds[0])
            value = self.uuid.uuid4()
            os.write(fds[1], value.hex.encode('latin-1'))
            os._exit(0)

        else:
            os.close(fds[1])
            self.addCleanup(os.close, fds[0])
            parent_value = self.uuid.uuid4().hex
            support.wait_process(pid, exitcode=0)
            child_value = os.read(fds[0], 100).decode('latin-1')

            self.assertNotEqual(parent_value, child_value)

    def test_uuid_weakref(self):
        # bpo-35701: check that weak referencing to a UUID object can be created
        strong = self.uuid.uuid4()
        weak = weakref.ref(strong)
        self.assertIs(strong, weak())

    @mock.patch.object(sys, "argv", ["", "-u", "uuid3", "-n", "@dns"])
    @mock.patch('sys.stderr', new_callable=io.StringIO)
    def test_cli_namespace_required_for_uuid3(self, mock_err):
        with self.assertRaises(SystemExit) as cm:
            self.uuid.main()

        # Check that exception code is the same as argparse.ArgumentParser.error
        self.assertEqual(cm.exception.code, 2)
        self.assertIn("error: Incorrect number of arguments", mock_err.getvalue())

    @mock.patch.object(sys, "argv", ["", "-u", "uuid3", "-N", "python.org"])
    @mock.patch('sys.stderr', new_callable=io.StringIO)
    def test_cli_name_required_for_uuid3(self, mock_err):
        with self.assertRaises(SystemExit) as cm:
            self.uuid.main()
        # Check that exception code is the same as argparse.ArgumentParser.error
        self.assertEqual(cm.exception.code, 2)
        self.assertIn("error: Incorrect number of arguments", mock_err.getvalue())

    @mock.patch.object(sys, "argv", [""])
    def test_cli_uuid4_outputted_with_no_args(self):
        stdout = io.StringIO()
        with contextlib.redirect_stdout(stdout):
            self.uuid.main()

        output = stdout.getvalue().strip()
        uuid_output = self.uuid.UUID(output)

        # Output uuid should be in the format of uuid4
        self.assertEqual(output, str(uuid_output))
        self.assertEqual(uuid_output.version, 4)

    @mock.patch.object(sys, "argv",
                       ["", "-u", "uuid3", "-n", "@dns", "-N", "python.org"])
    def test_cli_uuid3_ouputted_with_valid_namespace_and_name(self):
        stdout = io.StringIO()
        with contextlib.redirect_stdout(stdout):
            self.uuid.main()

        output = stdout.getvalue().strip()
        uuid_output = self.uuid.UUID(output)

        # Output should be in the form of uuid5
        self.assertEqual(output, str(uuid_output))
        self.assertEqual(uuid_output.version, 3)

    @mock.patch.object(sys, "argv",
                       ["", "-u", "uuid5", "-n", "@dns", "-N", "python.org"])
    def test_cli_uuid5_ouputted_with_valid_namespace_and_name(self):
        stdout = io.StringIO()
        with contextlib.redirect_stdout(stdout):
            self.uuid.main()

        output = stdout.getvalue().strip()
        uuid_output = self.uuid.UUID(output)

        # Output should be in the form of uuid5
        self.assertEqual(output, str(uuid_output))
        self.assertEqual(uuid_output.version, 5)


class TestUUIDWithoutExtModule(BaseTestUUID, unittest.TestCase):
    uuid = py_uuid

@unittest.skipUnless(c_uuid, 'requires the C _uuid module')
class TestUUIDWithExtModule(BaseTestUUID, unittest.TestCase):
    uuid = c_uuid


class BaseTestInternals:
    _uuid = py_uuid

    def check_parse_mac(self, aix):
        if not aix:
            patch = mock.patch.multiple(self.uuid,
                                        _MAC_DELIM=b':',
                                        _MAC_OMITS_LEADING_ZEROES=False)
        else:
            patch = mock.patch.multiple(self.uuid,
                                        _MAC_DELIM=b'.',
                                        _MAC_OMITS_LEADING_ZEROES=True)

        with patch:
            # Valid MAC addresses
            if not aix:
                tests = (
                    (b'52:54:00:9d:0e:67', 0x5254009d0e67),
                    (b'12:34:56:78:90:ab', 0x1234567890ab),
                )
            else:
                # AIX format
                tests = (
                    (b'fe.ad.c.1.23.4', 0xfead0c012304),
                )
            for mac, expected in tests:
                self.assertEqual(self.uuid._parse_mac(mac), expected)

            # Invalid MAC addresses
            for mac in (
                b'',
                # IPv6 addresses with same length than valid MAC address
                # (17 characters)
                b'fe80::5054:ff:fe9',
                b'123:2:3:4:5:6:7:8',
                # empty 5rd field
                b'52:54:00:9d::67',
                # only 5 fields instead of 6
                b'52:54:00:9d:0e'
                # invalid character 'x'
                b'52:54:00:9d:0e:6x'
                # dash separator
                b'52-54-00-9d-0e-67',
            ):
                if aix:
                    mac = mac.replace(b':', b'.')
                with self.subTest(mac=mac):
                    self.assertIsNone(self.uuid._parse_mac(mac))

    def test_parse_mac(self):
        self.check_parse_mac(False)

    def test_parse_mac_aix(self):
        self.check_parse_mac(True)

    def test_find_under_heading(self):
        data = '''\
Name  Mtu   Network     Address           Ipkts Ierrs    Opkts Oerrs  Coll
en0   1500  link#2      fe.ad.c.1.23.4   1714807956     0 711348489     0     0
                        01:00:5e:00:00:01
en0   1500  192.168.129 x071             1714807956     0 711348489     0     0
                        224.0.0.1
en0   1500  192.168.90  x071             1714807956     0 711348489     0     0
                        224.0.0.1
'''

        # The above data is from AIX - with '.' as _MAC_DELIM and strings
        # shorter than 17 bytes (no leading 0). (_MAC_OMITS_LEADING_ZEROES=True)
        with mock.patch.multiple(self.uuid,
                                 _MAC_DELIM=b'.',
                                 _MAC_OMITS_LEADING_ZEROES=True,
                                 _get_command_stdout=mock_get_command_stdout(data)):
            mac = self.uuid._find_mac_under_heading(
                command='netstat',
                args='-ian',
                heading=b'Address',
            )

        self.assertEqual(mac, 0xfead0c012304)

    def test_find_under_heading_ipv6(self):
        # bpo-39991: IPv6 address "fe80::5054:ff:fe9" looks like a MAC address
        # (same string length) but must be skipped
        data = '''\
Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts Oerrs  Coll
vtnet  1500 <Link#1>      52:54:00:9d:0e:67    10017     0     0     8174     0     0
vtnet     - fe80::%vtnet0 fe80::5054:ff:fe9        0     -     -        4     -     -
vtnet     - 192.168.122.0 192.168.122.45        8844     -     -     8171     -     -
lo0   16384 <Link#2>      lo0                 260148     0     0   260148     0     0
lo0       - ::1/128       ::1                    193     -     -      193     -     -
                          ff01::1%lo0
                          ff02::2:2eb7:74fa
                          ff02::2:ff2e:b774
                          ff02::1%lo0
                          ff02::1:ff00:1%lo
lo0       - fe80::%lo0/64 fe80::1%lo0              0     -     -        0     -     -
                          ff01::1%lo0
                          ff02::2:2eb7:74fa
                          ff02::2:ff2e:b774
                          ff02::1%lo0
                          ff02::1:ff00:1%lo
lo0       - 127.0.0.0/8   127.0.0.1           259955     -     -   259955     -     -
                          224.0.0.1
'''

        with mock.patch.multiple(self.uuid,
                                 _MAC_DELIM=b':',
                                 _MAC_OMITS_LEADING_ZEROES=False,
                                 _get_command_stdout=mock_get_command_stdout(data)):
            mac = self.uuid._find_mac_under_heading(
                command='netstat',
                args='-ian',
                heading=b'Address',
            )

        self.assertEqual(mac, 0x5254009d0e67)

    def test_find_mac_near_keyword(self):
        # key and value are on the same line
        data = '''
fake      Link encap:UNSPEC  hwaddr 00-00
cscotun0  Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
eth0      Link encap:Ethernet  HWaddr 12:34:56:78:90:ab
'''

        # The above data will only be parsed properly on non-AIX unixes.
        with mock.patch.multiple(self.uuid,
                                 _MAC_DELIM=b':',
                                 _MAC_OMITS_LEADING_ZEROES=False,
                                 _get_command_stdout=mock_get_command_stdout(data)):
            mac = self.uuid._find_mac_near_keyword(
                command='ifconfig',
                args='',
                keywords=[b'hwaddr'],
                get_word_index=lambda x: x + 1,
            )

        self.assertEqual(mac, 0x1234567890ab)

    def check_node(self, node, requires=None):
        if requires and node is None:
            self.skipTest('requires ' + requires)
        hex = '%012x' % node
        if support.verbose >= 2:
            print(hex, end=' ')
        self.assertTrue(0 < node < (1 << 48),
                        "%s is not an RFC 4122 node ID" % hex)

    @unittest.skipUnless(_uuid._ifconfig_getnode in _uuid._GETTERS,
        "ifconfig is not used for introspection on this platform")
    def test_ifconfig_getnode(self):
        node = self.uuid._ifconfig_getnode()
        self.check_node(node, 'ifconfig')

    @unittest.skipUnless(_uuid._ip_getnode in _uuid._GETTERS,
        "ip is not used for introspection on this platform")
    def test_ip_getnode(self):
        node = self.uuid._ip_getnode()
        self.check_node(node, 'ip')

    @unittest.skipUnless(_uuid._arp_getnode in _uuid._GETTERS,
        "arp is not used for introspection on this platform")
    def test_arp_getnode(self):
        node = self.uuid._arp_getnode()
        self.check_node(node, 'arp')

    @unittest.skipUnless(_uuid._lanscan_getnode in _uuid._GETTERS,
        "lanscan is not used for introspection on this platform")
    def test_lanscan_getnode(self):
        node = self.uuid._lanscan_getnode()
        self.check_node(node, 'lanscan')

    @unittest.skipUnless(_uuid._netstat_getnode in _uuid._GETTERS,
        "netstat is not used for introspection on this platform")
    def test_netstat_getnode(self):
        node = self.uuid._netstat_getnode()
        self.check_node(node, 'netstat')

    def test_random_getnode(self):
        node = self.uuid._random_getnode()
        # The multicast bit, i.e. the least significant bit of first octet,
        # must be set for randomly generated MAC addresses.  See RFC 4122,
        # $4.1.6.
        self.assertTrue(node & (1 << 40), '%012x' % node)
        self.check_node(node)

        node2 = self.uuid._random_getnode()
        self.assertNotEqual(node2, node, '%012x' % node)

class TestInternalsWithoutExtModule(BaseTestInternals, unittest.TestCase):
    uuid = py_uuid

@unittest.skipUnless(c_uuid, 'requires the C _uuid module')
class TestInternalsWithExtModule(BaseTestInternals, unittest.TestCase):
    uuid = c_uuid

    @unittest.skipUnless(os.name == 'posix', 'requires Posix')
    def test_unix_getnode(self):
        if not importable('_uuid') and not importable('ctypes'):
            self.skipTest("neither _uuid extension nor ctypes available")
        try: # Issues 1481, 3581: _uuid_generate_time() might be None.
            node = self.uuid._unix_getnode()
        except TypeError:
            self.skipTest('requires uuid_generate_time')
        self.check_node(node, 'unix')

    @unittest.skipUnless(os.name == 'nt', 'requires Windows')
    def test_windll_getnode(self):
        node = self.uuid._windll_getnode()
        self.check_node(node)


if __name__ == '__main__':
    unittest.main()
