Thomas Wouters wrote:
> I'm seeing spurious test failures in test_timeout, on my own workstation and
> on macteagle.python.org (now that it crashes less; Apple sent over some new
> memory.) The problem is pretty simple: both macteagle and my workstation
> live too closely, network-wise, to www.python.org:
>
> class TimeoutTestCase(unittest.TestCase):
> [...]
> def setUp(self):
> [...]
> self.addr_remote = ('www.python.org', 80)
> [...]
> def testConnectTimeout(self):
> # Test connect() timeout
> _timeout = 0.001
> self.sock.settimeout(_timeout)
>
> _t1 = time.time()
> self.failUnlessRaises(socket.error, self.sock.connect,
> self.addr_remote)
>
> In other words, the test fails because www.python.org responds too quickly.
>
> The test on my workstation only fails occasionally, but I do expect
> macteagle's failure to be more common (since it's connected to
> www.python.org through (literally) a pair of gigabit switches, whereas my
> workstation has to pass through a few more switches, two Junipers and some
> dark fiber.) Lowering the timeout has no effect, as far as I can tell, which
> is probably a granularity issue.
>
> I'm thinking that it could probably try to connect to a less reliable
> website, but that's just moving the problem around (and possibly harassing
> an unsuspecting website, particularly around release-time.) Perhaps the test
> should try to connect to a known unconnecting site, like a firewalled port
> on www.python.org? Not something that refuses connections, just something
> that times out.
>
Couldn't the test use subprocess to start a reliably slow server on
localhost? It might even be possible to retrieve the ephemeral port
number used by the server, to avoid conflicts with already-used ports on
the testing machine.
regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.python.org/pycon/
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