Apparently this patch isn't sufficient for test___all__.
Please create empty _xmlplus directory (without __init__.py) in site-packages directory appropriate for given sys.prefix (e.g. /usr/lib/python3.2/site-packages/_xmlplus for sys.prefix='/usr').

The output of `make test` contains:
LD_LIBRARY_PATH=/var/tmp/portage/dev-lang/python-3.2_pre20110102/work/python-3.2_pre20110102: ./python -Wd -E -bb -S -s  ./Lib/test/regrtest.py -j1 
== CPython 3.2b2+ (py3k:87612, Jan 3 2011, 18:30:27) [GCC 4.4.5]
==   Linux-2.6.34-tuxonice-r8-AFTA-x86_64-Intel-R-_Pentium-R-_Dual_CPU_T2390_@_1.86GHz-with-gentoo-2.0.1 little-endian
==   /var/tmp/portage/dev-lang/python-3.2_pre20110102/work/python-3.2_pre20110102/build/test_python_2301
[  1/349] test_grammar
[  2/349] test_opcodes
[  3/349] test_dict
[  4/349] test_builtin
[  5/349] test_exceptions
[  6/349] test_types
[  7/349] test_unittest
[  8/349] test_doctest

[  9/349] test_doctest2

[ 10/349] test___all__

Warning -- sys.path was modified by test___all__
test test___all__ failed -- Traceback (most recent call last):
  File "/var/tmp/portage/dev-lang/python-3.2_pre20110102/work/python-3.2_pre20110102/Lib/test/test___all__.py", line 101, in test_all
    self.check_all(modname)
  File "/var/tmp/portage/dev-lang/python-3.2_pre20110102/work/python-3.2_pre20110102/Lib/test/test___all__.py", line 28, in check_all
    raise FailedImport(modname)
  File "/var/tmp/portage/dev-lang/python-3.2_pre20110102/work/python-3.2_pre20110102/Lib/contextlib.py", line 35, in __exit__
    next(self.gen)
  File "/var/tmp/portage/dev-lang/python-3.2_pre20110102/work/python-3.2_pre20110102/Lib/test/support.py", line 623, in _filterwarnings
    raise AssertionError("unhandled warning %s" % reraise[0])
AssertionError: unhandled warning {message : ImportWarning("Not importing directory '/usr/lib/python3.2/site-packages/_xmlplus': missing __init__.py",), category : 'ImportWarning', filename : '/var/tmp/portage/dev-lang/python-3.2_pre20110102/work/python-3.2_pre20110102/Lib/xml/__init__.py', lineno : 26, line : None}
[ 11/349] test___future__
[ 12/349] test__locale
[ 13/349] test_abc