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cpython/Lib/test/test_uuid.py
Ronald Oussoren ac764d3d5f Merged revisions 80784 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r80784 | ronald.oussoren | 2010-05-05 16:48:37 +0200 (Wed, 05 May 2010) | 9 lines

  The C function used by uuid.uuid4 is broken on
  OSX 10.6 in that after os.fork() the parent and
  child generate the same sequence of UUIDs.

  This patch falls back to the the Python implementation
  on OSX 10.6 or later.

  Fixes issue #8621.
........
2010-05-05 15:32:33 +00:00

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from unittest import TestCase
from test import support
import builtins
import uuid
def importable(name):
try:
__import__(name)
return True
except:
return False
class TestUUID(TestCase):
last_node = None
source2node = {}
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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, uuid.RESERVED_FUTURE, None),
]:
equivalents = []
# Construct each UUID in several different ways.
for u in [uuid.UUID(string), uuid.UUID(curly), uuid.UUID(hex),
uuid.UUID(bytes=bytes), uuid.UUID(bytes_le=bytes_le),
uuid.UUID(fields=fields), uuid.UUID(int=integer),
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: uuid.UUID(''))
badvalue(lambda: uuid.UUID('abc'))
badvalue(lambda: uuid.UUID('1234567812345678123456781234567'))
badvalue(lambda: uuid.UUID('123456781234567812345678123456789'))
badvalue(lambda: uuid.UUID('123456781234567812345678z2345678'))
# Badly formed bytes.
badvalue(lambda: uuid.UUID(bytes='abc'))
badvalue(lambda: uuid.UUID(bytes='\0'*15))
badvalue(lambda: uuid.UUID(bytes='\0'*17))
# Badly formed bytes_le.
badvalue(lambda: uuid.UUID(bytes_le='abc'))
badvalue(lambda: uuid.UUID(bytes_le='\0'*15))
badvalue(lambda: uuid.UUID(bytes_le='\0'*17))
# Badly formed fields.
badvalue(lambda: uuid.UUID(fields=(1,)))
badvalue(lambda: uuid.UUID(fields=(1, 2, 3, 4, 5)))
badvalue(lambda: uuid.UUID(fields=(1, 2, 3, 4, 5, 6, 7)))
# Field values out of range.
badvalue(lambda: uuid.UUID(fields=(-1, 0, 0, 0, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0x100000000, 0, 0, 0, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0, -1, 0, 0, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0x10000, 0, 0, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0, -1, 0, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0, 0x10000, 0, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0, 0, -1, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0, 0, 0x100, 0, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0, 0, 0, -1, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0, 0, 0, 0x100, 0)))
badvalue(lambda: uuid.UUID(fields=(0, 0, 0, 0, 0, -1)))
badvalue(lambda: uuid.UUID(fields=(0, 0, 0, 0, 0, 0x1000000000000)))
# Version number out of range.
badvalue(lambda: uuid.UUID('00'*16, version=0))
badvalue(lambda: uuid.UUID('00'*16, version=6))
# Integer value out of range.
badvalue(lambda: uuid.UUID(int=-1))
badvalue(lambda: 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
uuid.UUID(h)
uuid.UUID(hex=h)
uuid.UUID(bytes=b)
uuid.UUID(bytes_le=b)
uuid.UUID(fields=f)
uuid.UUID(int=i)
# Wrong number of arguments (positional).
badtype(lambda: uuid.UUID())
badtype(lambda: uuid.UUID(h, b))
badtype(lambda: uuid.UUID(h, b, b))
badtype(lambda: uuid.UUID(h, b, b, f))
badtype(lambda: 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: uuid.UUID(h, **args))
if len(args) != 1:
badtype(lambda: uuid.UUID(**args))
# Immutability.
u = 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))
def check_node(self, node, source):
message = "%012x is not an RFC 4122 node ID" % node
self.assertTrue(0 < node, message)
self.assertTrue(node < (1 << 48), message)
TestUUID.source2node[source] = node
if TestUUID.last_node:
if TestUUID.last_node != node:
msg = "different sources disagree on node:\n"
for s, n in TestUUID.source2node.items():
msg += " from source %r, node was %012x\n" % (s, n)
# There's actually no reason to expect the MAC addresses
# to agree across various methods -- e.g., a box may have
# multiple network interfaces, and different ways of getting
# a MAC address may favor different HW.
##self.fail(msg)
else:
TestUUID.last_node = node
def test_ifconfig_getnode(self):
import sys
import os
if os.name == 'posix':
node = uuid._ifconfig_getnode()
if node is not None:
self.check_node(node, 'ifconfig')
def test_ipconfig_getnode(self):
import os
if os.name == 'nt':
node = uuid._ipconfig_getnode()
if node is not None:
self.check_node(node, 'ipconfig')
def test_netbios_getnode(self):
if importable('win32wnet') and importable('netbios'):
self.check_node(uuid._netbios_getnode(), 'netbios')
def test_random_getnode(self):
node = uuid._random_getnode()
# Least significant bit of first octet must be set.
self.assertTrue(node & 0x010000000000)
self.assertTrue(node < (1 << 48))
def test_unixdll_getnode(self):
import sys
import os
if importable('ctypes') and os.name == 'posix':
try: # Issues 1481, 3581: _uuid_generate_time() might be None.
self.check_node(uuid._unixdll_getnode(), 'unixdll')
except TypeError:
pass
def test_windll_getnode(self):
import os
if importable('ctypes') and os.name == 'nt':
self.check_node(uuid._windll_getnode(), 'windll')
def test_getnode(self):
import sys
node1 = uuid.getnode()
self.check_node(node1, "getnode1")
# Test it again to ensure consistency.
node2 = uuid.getnode()
self.check_node(node2, "getnode2")
self.assertEqual(node1, node2)
def test_uuid1(self):
# uuid1 requires ctypes.
try:
import ctypes
except ImportError:
return
equal = self.assertEqual
# Make sure uuid1() generates UUIDs that are actually version 1.
for u in [uuid.uuid1() for i in range(10)]:
equal(u.variant, uuid.RFC_4122)
equal(u.version, 1)
# Make sure the generated UUIDs are actually unique.
uuids = {}
for u in [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 = uuid.uuid1(0)
equal(u.node, 0)
u = uuid.uuid1(0x123456789abc)
equal(u.node, 0x123456789abc)
u = uuid.uuid1(0xffffffffffff)
equal(u.node, 0xffffffffffff)
# Make sure the supplied clock sequence appears in the UUID.
u = uuid.uuid1(0x123456789abc, 0)
equal(u.node, 0x123456789abc)
equal(((u.clock_seq_hi_variant & 0x3f) << 8) | u.clock_seq_low, 0)
u = uuid.uuid1(0x123456789abc, 0x1234)
equal(u.node, 0x123456789abc)
equal(((u.clock_seq_hi_variant & 0x3f) << 8) |
u.clock_seq_low, 0x1234)
u = uuid.uuid1(0x123456789abc, 0x3fff)
equal(u.node, 0x123456789abc)
equal(((u.clock_seq_hi_variant & 0x3f) << 8) |
u.clock_seq_low, 0x3fff)
def test_uuid3(self):
equal = self.assertEqual
# Test some known version-3 UUIDs.
for u, v in [(uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org'),
'6fa459ea-ee8a-3ca4-894e-db77e160355e'),
(uuid.uuid3(uuid.NAMESPACE_URL, 'http://python.org/'),
'9fe8e8c4-aaa8-32a9-a55c-4535a88b748d'),
(uuid.uuid3(uuid.NAMESPACE_OID, '1.3.6.1'),
'dd1a1cef-13d5-368a-ad82-eca71acd4cd1'),
(uuid.uuid3(uuid.NAMESPACE_X500, 'c=ca'),
'658d3002-db6b-3040-a1d1-8ddd7d189a4d'),
]:
equal(u.variant, uuid.RFC_4122)
equal(u.version, 3)
equal(u, uuid.UUID(v))
equal(str(u), v)
def test_uuid4(self):
# uuid4 requires ctypes.
try:
import ctypes
except ImportError:
return
equal = self.assertEqual
# Make sure uuid4() generates UUIDs that are actually version 4.
for u in [uuid.uuid4() for i in range(10)]:
equal(u.variant, uuid.RFC_4122)
equal(u.version, 4)
# Make sure the generated UUIDs are actually unique.
uuids = {}
for u in [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.
for u, v in [(uuid.uuid5(uuid.NAMESPACE_DNS, 'python.org'),
'886313e1-3b8a-5372-9b90-0c9aee199e5d'),
(uuid.uuid5(uuid.NAMESPACE_URL, 'http://python.org/'),
'4c565f0d-3f5a-5890-b41b-20cf47701c5e'),
(uuid.uuid5(uuid.NAMESPACE_OID, '1.3.6.1'),
'1447fa61-5277-5fef-a9b3-fbc6e44f4af3'),
(uuid.uuid5(uuid.NAMESPACE_X500, 'c=ca'),
'cc957dd1-a972-5349-98cd-874190002798'),
]:
equal(u.variant, uuid.RFC_4122)
equal(u.version, 5)
equal(u, uuid.UUID(v))
equal(str(u), v)
def testIssue8621(self):
import os
import sys
if os.name != 'posix':
return
# On at least some versions of OSX 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 = uuid.uuid4()
os.write(fds[1], value.hex.encode('latin1'))
os._exit(0)
else:
os.close(fds[1])
parent_value = uuid.uuid4().hex
os.waitpid(pid, 0)
child_value = os.read(fds[0], 100).decode('latin1')
self.assertNotEqual(parent_value, child_value)
def test_main():
support.run_unittest(TestUUID)
if __name__ == '__main__':
test_main()
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