Fix test discovery for test_io.py

[zware]

BPO	17479
Nosy	@brettcannon, @ezio-melotti, @zware
Files	test_io_discovery.diff: test_io.py fix, version 1

^{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 = 'https://github.com/ezio-melotti'
closed_at = <Date 2013-03-23.14:37:52.693>
created_at = <Date 2013-03-19.15:05:26.004>
labels = ['type-bug', 'tests']
title = 'Fix test discovery for test_io.py'
updated_at = <Date 2013-03-23.14:37:52.692>
user = 'https://github.com/zware'

bugs.python.org fields:

activity = <Date 2013-03-23.14:37:52.692>
actor = 'ezio.melotti'
assignee = 'ezio.melotti'
closed = True
closed_date = <Date 2013-03-23.14:37:52.693>
closer = 'ezio.melotti'
components = ['Tests']
creation = <Date 2013-03-19.15:05:26.004>
creator = 'zach.ware'
dependencies = []
files = ['29478']
hgrepos = []
issue_num = 17479
keywords = ['patch']
message_count = 3.0
messages = ['184636', '185051', '185052']
nosy_count = 4.0
nosy_names = ['brett.cannon', 'ezio.melotti', 'python-dev', 'zach.ware']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue17479'
versions = ['Python 3.3', 'Python 3.4']

[zware]

This patch converts test_main() to load_tests(*args) due to test_main doing a lot of namespace manipulation on all the test classes. There are a lot of subclassing issues that discovery doesn't like, hence throwing away the second argument passed to load_tests and just creating the tests the way test_main did.

[python-dev]

New changeset fa9e189e30ad by Ezio Melotti in branch '3.3':
bpo-17479: test_io now works with unittest test discovery. Patch by Zachary Ware.
http://hg.python.org/cpython/rev/fa9e189e30ad

New changeset 99a81681237d by Ezio Melotti in branch 'default':
bpo-17479: merge with 3.3.
http://hg.python.org/cpython/rev/99a81681237d

[ezio-melotti]

Fixed, thanks for the patch!