There is a line in the test code:
   if sys.platform in ('win32', 'os2emx', 'mac'):

that is not addressing unix platforms.  On AIX 
sys.platfrom returns aix5.

Here is the output:

test_exports (__main__.test_exports) ... ok
test_get_six_char_str 
(__main__.test__RandomNameSequence) ... ok
test_many (__main__.test__RandomNameSequence) ... 
ok
test_supports_iter 
(__main__.test__RandomNameSequence) ... ok
test_nonempty_list 
(__main__.test__candidate_tempdir_list) ... ok
test_wanted_dirs 
(__main__.test__candidate_tempdir_list) ... ok
test_retval (__main__.test__get_candidate_names) ... ok
test_same_thing 
(__main__.test__get_candidate_names) ... ok
test_basic (__main__.test__mkstemp_inner) ... ok
test_basic_many (__main__.test__mkstemp_inner) ... ok
test_choose_directory 
(__main__.test__mkstemp_inner) ... ok
test_file_mode (__main__.test__mkstemp_inner) ... ok
test_noinherit (__main__.test__mkstemp_inner) ... ok
test_textmode (__main__.test__mkstemp_inner) ... ok
test_sane_template (__main__.test_gettempprefix) ... ok
test_usable_template (__main__.test_gettempprefix) ... 
ok
test_directory_exists (__main__.test_gettempdir) ... ok
test_directory_writable (__main__.test_gettempdir) ... ok
test_same_thing (__main__.test_gettempdir) ... ok
test_basic (__main__.test_mkstemp) ... ok
test_choose_directory (__main__.test_mkstemp) ... ok
test_basic (__main__.test_mkdtemp) ... ok
test_basic_many (__main__.test_mkdtemp) ... ok
test_choose_directory (__main__.test_mkdtemp) ... ok
test_mode (__main__.test_mkdtemp) ... FAIL
test_basic (__main__.test_mktemp) ... ok
test_many (__main__.test_mktemp) ... ok
test_basic (__main__.test_NamedTemporaryFile) ... ok
test_creates_named 
(__main__.test_NamedTemporaryFile) ... ok
test_del_on_close 
(__main__.test_NamedTemporaryFile) ... ok
test_multiple_close 
(__main__.test_NamedTemporaryFile) ... ok
test_basic (__main__.test_TemporaryFile) ... ok
test_has_no_name (__main__.test_TemporaryFile) ... ok
test_multiple_close (__main__.test_TemporaryFile) ... ok

==========================================
============================
FAIL: test_mode (__main__.test_mkdtemp)
-------------------------------------------------------
---------------
Traceback (most recent call last):
  File "Lib/test/test_tempfile.py", line 482, in test_mode
    self.assertEqual(mode, expected)
  File "/cmDevTest/Tools/Python-2.Lib/unittest.py", 
line 302, in failUnlessEqual
    raise self.failureException, \
AssertionError: 1472 != 448

-------------------------------------------------------
---------------
Ran 34 tests in 0.507s

FAILED (failures=1)
Traceback (most recent call last):
  File "Lib/test/test_tempfile.py", line 659, in ?
    test_main()
  File "Lib/test/test_tempfile.py", line 656, in test_main
    test_support.run_unittest(*test_classes)
  File "/cmDevTest/Tools/Python-
2.Lib/test/test_support.py", line 262, in run_unittest
    run_suite(suite, testclass)
  File "/cmDevTest/Tools/Python-
2.Lib/test/test_support.py", line 247, in run_suite
    raise TestFailed(err)
test.test_support.TestFailed: Traceback (most recent 
call last):
  File "Lib/test/test_tempfile.py", line 482, in test_mode
    self.assertEqual(mode, expected)
  File "/cmDevTest/Tools/Python-2.Lib/unittest.py", 
line 302, in failUnlessEqual
    raise self.failureException, \
AssertionError: 1472 != 448