[issue39029] TestMaildir.test_clean fails randomly under parallel tests
STINNER Victor
report at bugs.python.org
Thu Jan 9 05:25:09 EST 2020
STINNER Victor <vstinner at python.org> added the comment:
> yes, the test uses support.TESTFN which has the value of "{}_{}_tmp".format(TESTFN, os.getpid()) in the setUp [0] to create tempdir. Under parallel tests the pid value of TESTFN is initialised with a pid once and used always in the setup calls. So setup acts under parallel tests with same test folder. The tempdir can be dynamically generated but I guess this pattern to use support.TESTFN is common and there could be other flaky tests.
I don't understand. Let's say that test_mailbox and test_os are run in parallel, process 1 runs test_mailbox and process 2 runs test_os. TESTFN should be different in each process but globally unique.
So I don't understand the difference between:
- self._path = support.TESTFN
and:
+ self._tempdir = tempfile.TemporaryDirectory()
+ self._path = self._tempdir.name
Is it because the test currently doesn't remove self._path directory in some cases?
You wrote "I guess the file is not really deleted in some cases." I think that this should be investigated first.
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<https://bugs.python.org/issue39029>
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