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I suspect that you have your interpreters confused. (For e.g, I see 3.4 run against the trunk and the error messages are leading me to believe that 2.7 version in run on 3 code).
Or your local copy is not in right shape.
I tested it on 3.4 and cpython default and everything was OK.
[localhost 3.4]$ ./python.exe -m unittest -v Lib/test/test_urllib2net.py
...
Ran 15 tests in 36.672s
OK
[localhost 3.4]$ hg log -r 3.4
changeset: 92551:bce1594023f9
branch: 3.4
parent: 92548:381d6362c7bc
parent: 92546:ff2cb4dc36e7
user: Serhiy Storchaka <storchaka@gmail.com>
date: Tue Sep 23 23:23:41 2014 +0300
description:
Merge heads
[localhost cpython]$ ./python.exe -m unittest -v Lib/test/test_urllib2net.py
...
Ran 15 tests in 32.779s
OK
[localhost cpython]$ hg log -r tip
changeset: 92555:064f6baeb6bd
tag: tip
user: Georg Brandl <georg@python.org>
date: Wed Sep 24 09:08:12 2014 +0200
files: Python/importlib.h
description:
Update importlib.h frozen bytecode (changed due to commit c0ca9d32aed4).