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gh-89083: improve UUIDv8 uniqueness tests (GH-128149)

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improve UUIDv8 uniqueness tests
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Bénédikt Tran 2025-01-03 15:51:22 +01:00 • committed by GitHub
parent 1c9b020479
commit 4c14f03495
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1 changed files with 10 additions and 6 deletions
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16
Lib/test/test_uuid.py
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@ -707,12 +707,16 @@ class BaseTestUUID:
equal(u.int & 0x3fffffffffffffff, lo)
def test_uuid8_uniqueness(self):
# Test that UUIDv8-generated values are unique
# (up to a negligible probability of failure).
u1 = self.uuid.uuid8()
u2 = self.uuid.uuid8()
self.assertNotEqual(u1.int, u2.int)
self.assertEqual(u1.version, u2.version)
# Test that UUIDv8-generated values are unique (up to a negligible
# probability of failure). There are 122 bits of entropy and assuming
# that the underlying mt-19937-based random generator is sufficiently
# good, it is unlikely to have a collision of two UUIDs.
N = 1000
uuids = {self.uuid.uuid8() for _ in range(N)}
self.assertEqual(len(uuids), N)
versions = {u.version for u in uuids}
self.assertSetEqual(versions, {8})
@support.requires_fork()
def testIssue8621(self):