timing test too tight

[pitrou]

BPO	19371
Nosy	@gvanrossum, @pitrou, @ezio-melotti
Superseder	bpo-19579: test_asyncio: test__run_once timings should be relaxed

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2013-11-17.00:57:58.669>
created_at = <Date 2013-10-23.22:20:01.745>
labels = ['tests', 'type-bug', 'library']
title = 'timing test too tight'
updated_at = <Date 2013-11-17.00:57:58.669>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2013-11-17.00:57:58.669>
actor = 'ezio.melotti'
assignee = 'none'
closed = True
closed_date = <Date 2013-11-17.00:57:58.669>
closer = 'ezio.melotti'
components = ['Library (Lib)', 'Tests']
creation = <Date 2013-10-23.22:20:01.745>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 19371
keywords = []
message_count = 2.0
messages = ['201077', '202717']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'pitrou', 'ezio.melotti']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '19579'
type = 'behavior'
url = 'https://bugs.python.org/issue19371'
versions = ['Python 3.4']

[pitrou]

Looks like test_asyncio still has rather tight timing expectations:

http://buildbot.python.org/all/builders/x86%20Windows%20Server%202008%20%5BSB%5D%203.x/builds/1495/steps/test/logs/stdio

======================================================================
FAIL: test__run_once (test.test_asyncio.test_base_events.BaseEventLoopTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\test\test_asyncio\test_base_events.py", line 182, in test__run_once
    self.assertTrue(9.99 < t < 10.1, t)
AssertionError: False is not true : 9.98499999998603

[ezio-melotti]

Also this should use assertAlmostEqual().