test.test_multiprocessing_spawn fails under -Werror

[brettcannon]

BPO	23827
Nosy	@brettcannon, @serhiy-storchaka
Superseder	bpo-21779: test_multiprocessing_spawn fails when ran with -Werror

^{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 2015-03-31.17:16:18.355>
created_at = <Date 2015-03-31.16:52:44.750>
labels = ['tests']
title = 'test.test_multiprocessing_spawn fails under -Werror'
updated_at = <Date 2015-03-31.17:16:18.353>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2015-03-31.17:16:18.353>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2015-03-31.17:16:18.355>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2015-03-31.16:52:44.750>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 23827
keywords = []
message_count = 2.0
messages = ['239731', '239737']
nosy_count = 2.0
nosy_names = ['brett.cannon', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '21779'
type = None
url = 'https://bugs.python.org/issue23827'
versions = ['Python 3.5']

[brettcannon]

======================================================================
FAIL: test_sys_exit (main.WithProcessesTestSubclassingProcess)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/bcannon/Repositories/cpython/pep-488/Lib/test/_test_multiprocessing.py", line 483, in test_sys_exit
    self.assertEqual(f.read().rstrip(), str(reason))
AssertionError: "[1, 2, 3]\nException ignored in: <_io.Fi[136 chars]-8'>" != '[1, 2, 3]'
- [1, 2, 3]
?          -
+ [1, 2, 3]- Exception ignored in: <_io.FileIO name='/dev/null' mode='rb' closefd=True>
- ResourceWarning: unclosed file <_io.TextIOWrapper name='/dev/null' mode='r' encoding='UTF-8'>

[serhiy-storchaka]

This is a duplicate of bpo-21779.