Source: python-passlib
Version: 1.6.5-4
Severity: serious
Tags: ftbfs
User: reproducible-builds@lists.alioth.debian.org
Usertags: randomess
X-Debbugs-Cc: reproducible-builds@lists.alioth.debian.org
Hi,
Whilst working on the Reproducible Builds effort [0], we noticed
that python-passlib's testsuite will non-determinstically FTBFS:
======================================================================
FAIL: test_getrandstr (passlib.tests.test_utils.MiscTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/build/python-passlib-1.6.5/2nd/passlib/tests/test_utils.py", line 129,
in test_getrandstr
self.assertEqual(sorted(set(x)), [u('a'),u('b'),u('c')])
AssertionError: Lists differ: [u'a', u'b'] != [u'a', u'b', u'c']
Second list contains 1 additional elements.
First extra element 2:
u'c'
- [u'a', u'b']
+ [u'a', u'b', u'c']
? ++++++
This is because of:
125 x = f(u('abc'), 16)
126 y = f(u('abc'), 16)
127 self.assertIsInstance(x, unicode)
128 self.assertNotEqual(x,y)
129 self.assertEqual(sorted(set(x)), [u('a'),u('b'),u('c')])
If the random string ``x`` doesn't contain a certain character, the
assertion will fail. By my quick calculation this will happen with a
probability of (2/3)^(16-1).
It will also FTBFS if it generates the exact same random string, but
that seems a little more unlikely.
[0] https://reproducible-builds.org/
Regards,
--
,''`.
: :' : Chris Lamb
`. `'` la...@debian.org / chris-lamb.co.uk
`-
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