> ======================================================================
> FAIL: test_call_later
> (test.test_asyncio.test_events.SelectEventLoopTests)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File
>   "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/test_asyncio/test_events.py",
>   line 241, in test_call_later
>     self.assertTrue(0.09 <= t1-t0 <= 0.12, t1-t0)
> AssertionError: False is not true : 0.12008954107295722

This one is a classical timing issue. The test is too optimistic:
many buildbots can be quite slow or loaded. Other timing tests in the
stdlib allow for much more slack.

(e.g. call_later with 0.5 and check that the resulting delay
is between 0.4 and 1.0)