On Sat, Aug 3, 2013 at 6:59 PM, Nick Coghlan <ncogh...@gmail.com> wrote: > > On 4 Aug 2013 09:43, "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. > > I'm not actively opposed to the suggested idea, but is there a specific > reason "test.support.import_fresh_module" doesn't work for this test?
I'm not an expert on this topic, but I believe there's a problem unloading code that was loaded by C extensions. import_fresh_module is thus powerless here (which also appears to be the case empirically). 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
