https://github.com/python/cpython/commit/4c14f03495724f2c52de2d34f1bfa35dd94757c0
commit: 4c14f03495724f2c52de2d34f1bfa35dd94757c0
branch: main
author: Bénédikt Tran <[email protected]>
committer: encukou <[email protected]>
date: 2025-01-03T15:51:22+01:00
summary:
gh-89083: improve UUIDv8 uniqueness tests (GH-128149)
improve UUIDv8 uniqueness tests
files:
M Lib/test/test_uuid.py
diff --git a/Lib/test/test_uuid.py b/Lib/test/test_uuid.py
index 7bd26a8ca34b62..8f40dd97f42fdc 100755
--- a/Lib/test/test_uuid.py
+++ b/Lib/test/test_uuid.py
@@ -707,12 +707,16 @@ def test_uuid8(self):
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):
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