Coverage for tests / test_uuid.py: 35%

1# This file is part of daf_butler. 

2# 

3# Developed for the LSST Data Management System. 

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5# (http://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

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9# This software is dual licensed under the GNU General Public License and also 

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13# (but note that there is still no warranty even if you opt for BSD instead): 

14# 

15# This program is free software: you can redistribute it and/or modify 

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19# 

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21# but WITHOUT ANY WARRANTY; without even the implied warranty of 

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27 

28import unittest 

29import unittest.mock 

30from uuid import RFC_4122 

31 

32from lsst.daf.butler._uuid import generate_uuidv7 

33 

34 

35class UUIDv7TestCase(unittest.TestCase): 

36 """Test generation of v7 UUIDs.""" 

37 

38 def test_generate_uuidv7(self) -> None: 

39 mock_timestamp_milliseconds = 1759355298139 

40 mock_timestamp_nanoseconds = (mock_timestamp_milliseconds * 1_000_000) + 123456 

41 with unittest.mock.patch("time.time_ns") as mock: 

42 mock.return_value = mock_timestamp_nanoseconds 

43 id = generate_uuidv7() 

44 self.assertEqual(id.version, 7) 

45 self.assertEqual(id.variant, RFC_4122) 

46 self.assertEqual(int.from_bytes(id.bytes[0:6], byteorder="big"), mock_timestamp_milliseconds) 

47 # The rest of the bytes in the ID are random, so just make sure 

48 # that two consecutive IDs are generating different bytes. 

49 second_id = generate_uuidv7() 

50 self.assertNotEqual(second_id.bytes[6:], id.bytes[6:]) 

51 # But the top six bytes should be the same, because we mocked 

52 # the same timestamp tick for both ID generations. 

53 self.assertEqual(second_id.bytes[0:6], id.bytes[0:6])