On Sat, Aug 3, 2013 at 6:57 PM, R. David Murray <rdmur...@bitdance.com> wrote: > On Sat, 03 Aug 2013 16:47:37 -0700, Eli Bendersky <eli...@gmail.com> wrote: >> On Sat, Aug 3, 2013 at 4:36 PM, Eli Bendersky <eli...@gmail.com> wrote: >> > Hi All, >> > >> > Today the issue of cross-test global env dependencies showed its ugly >> > head again for me. I recall a previous discussion >> > (http://mail.python.org/pipermail/python-dev/2013-January/123409.html) >> > but there were many more over the years. >> > >> > The core problem is that some tests modify the global env >> > (particularly importing modules) and this sometimes has adverse >> > effects on other tests, because test.regrtest runs all tests in a >> > single process. In the discussion linked above, the particular culprit >> > test__all__ was judged as a candidate to be moved to a subprocess. >> > >> > I want to propose adding a capability to our test harness to run >> > specific tests in subprocesses. Each test will have some simple way of >> > asking to be run in a subprocess, and regrtest will concur (even when >> > running -j1). test__all__ can go there, and it can help solve other >> > problems. >> > >> > My particular case is trying to write a test for >> > http://bugs.python.org/issue14988 - wherein I have to simulate a >> > situation of non-existent pyexpat. It's not hard to write a test for >> > it, but when run in tandem with other tests (where C extensions loaded >> > pyexpat) it becomes seemingly impossible to set up. This should not be >> > the case - there's nothing wrong with wanting to simulate this case, >> > and there's nothing wrong in Python and the stdlib - it's purely an >> > artifact of the way our regression suite works. >> > >> > Thoughts? >> > >> > Eli >> >> FWIW the problem is also discussed here: >> http://bugs.python.org/issue1674555, w.r.t. test_site > > Can't you just launch a subprocess from the test itself using script_helpers? >
[sorry, sent privately by mistake; forwarding to pydev] I can, but such launching will be necessarily duplicated across all tests that need this functionality (test_site, test___all__, etc). Since regrtest already has functionality for launching whole test-suites in subprocesses, it makes sense to reuse it, no? Eli _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
