[py-dev] Intermittent errors on py/misc/testing/test_cache.py

[holger krekel]

Hi Grig, 

On Tue, May 10, 2005 at 16:05 -0700, Grig Gheorghiu wrote:
> I sometimes get this error on a WinXP box:
> 
>     def test_cache_eviction(self):
>         self.cache.getorbuild(17, lambda: 17)
>         py.std.time.sleep(self.maxsecs*1.3)
> E       assert self.cache.getentry(17) is None
> >       AssertionError

side note: weren't there more details shown in the
next line? 

> [C:\py\py\misc\testing\test_cache.py:55]
> [modulepath: TestAging().test_cache_eviction]
> 
> It happens pretty consistently, but not all the time.
> I haven't seen it yet on Win2K Pro or Red Hat 9.

The test is badly written on my side. Waiting fixed amounts of
time is a bad idea and i am guessing that the time resolution
has interactions with platform details.  I have rewritten the
test to loop longer ... although i think the real solution
would be to set the time that the 'cache' perceives  manually
from the test and then check that the eviction logic does
its work.

cheers, 

    holger