On Wed, 25 Jul 2018 at 15:16 Tim Golden <m...@timgolden.me.uk> wrote:
> I'm just easing back into core development work by trying to get a > stable testing environment for Python development on Windows. > > One problem is that certain tests use support.TESTFN (a local directory > constructed from the pid) for output files etc. However this can cause > issues on Windows when recreating the folders / files for multiple > tests, especially when running in parallel. > > Here's an example on my laptop deliberately running 3 tests with -j0 > which I know will generate an error about one time in three: > > C:\work-in-progress\cpython>python -mtest -j0 test_urllib2 test_bz2 > test_importlib > > Running Debug|Win32 interpreter... > Run tests in parallel using 6 child processes > 0:00:23 [1/3/1] test_urllib2 failed > test test_urllib2 failed -- Traceback (most recent call last): > File "C:\work-in-progress\cpython\lib\test\test_urllib2.py", line > 821, in test_file > f = open(TESTFN, "wb") > PermissionError: [Errno 13] Permission denied: '@test_15564_tmp' > > Although these errors are both intermittent and fairly easily spotted, > the effect is that I rarely get a clean test run when I'm applying a patch. > > I started to address this years ago but things stalled. I'm happy to > pick this up again and have another go, but I wanted to ask first > whether there was any objection to my converting tests to using tempfile > functions which should avoid the problem? > I personally don't see any reason to block a move away from TESTFN since it obviously has some inherent issues in parallel test running which means flaky tests.
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