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I'm *assuming* this is a Mac OS X issue. (10.6.2)
./python.exe Lib/test/test_pep277.py
test_directory (__main__.UnicodeFileTests) ... ok
test_failures (__main__.UnicodeFileTests) ... ok
test_listdir (__main__.UnicodeFileTests) ... FAIL
test_open (__main__.UnicodeFileTests) ... ok
test_rename (__main__.UnicodeFileTests) ... ok
======================================================================
FAIL: test_listdir (__main__.UnicodeFileTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "Lib/test/test_pep277.py", line 92, in test_listdir
 self.assertEqual(sf2, set(self.files))
AssertionError: Items in the first set but not the second:
u'@test_969_tmp/\u0393\u03b5\u03b9\u03b1\u0301-\u03c3\u03b1\u03c2'
u'@test_969_tmp/Gru\u0308\xdf-Gott'
u'@test_969_tmp/\u0417\u0434\u0440\u0430\u0432\u0441\u0442\u0432\u0443\u0438\u0306\u0442\u0435'
u'@test_969_tmp/\u306b\u307b\u309a\u3093'
Items in the second set but not the first:
u'@test_969_tmp/\u0393\u03b5\u03b9\u03ac-\u03c3\u03b1\u03c2'
u'@test_969_tmp/\u0417\u0434\u0440\u0430\u0432\u0441\u0442\u0432\u0443\u0439\u0442\u0435'
u'@test_969_tmp/Gr\xfc\xdf-Gott'
u'@test_969_tmp/\u306b\u307d\u3093'
----------------------------------------------------------------------
Ran 5 tests in 0.021s
FAILED (failures=1)
Traceback (most recent call last):
 File "Lib/test/test_pep277.py", line 120, in <module>
 test_main()
 File "Lib/test/test_pep277.py", line 115, in test_main
 test_support.run_unittest(UnicodeFileTests)
 File "/compile/python-back/Lib/test/test_support.py", line 1031, in run_unittest
 _run_suite(suite)
 File "/compile/python-back/Lib/test/test_support.py", line 1014, in _run_suite
 raise TestFailed(err)
test.test_support.TestFailed: Traceback (most recent call last):
 File "Lib/test/test_pep277.py", line 92, in test_listdir
 self.assertEqual(sf2, set(self.files))
AssertionError: Items in the first set but not the second:
u'@test_969_tmp/\u0393\u03b5\u03b9\u03b1\u0301-\u03c3\u03b1\u03c2'
u'@test_969_tmp/Gru\u0308\xdf-Gott'
u'@test_969_tmp/\u0417\u0434\u0440\u0430\u0432\u0441\u0442\u0432\u0443\u0438\u0306\u0442\u0435'
u'@test_969_tmp/\u306b\u307b\u309a\u3093'
Items in the second set but not the first:
u'@test_969_tmp/\u0393\u03b5\u03b9\u03ac-\u03c3\u03b1\u03c2'
u'@test_969_tmp/\u0417\u0434\u0440\u0430\u0432\u0441\u0442\u0432\u0443\u0439\u0442\u0435'
u'@test_969_tmp/Gr\xfc\xdf-Gott'
u'@test_969_tmp/\u306b\u307d\u3093'

r78585 to test_pep277.py recently enabled this test for all POSIX systems but note the warning in r33595.

This patch should fix the test on OS X platforms.

A patch with more Unicode normalization tests.
Could you test it on Windows or Mac OS X?

The test passes with the first patch applied (darwin.diff). With the second patch applied I get two failures:
======================================================================
ERROR: test_normalize (__main__.UnicodeFileTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "Lib/test/test_pep277.py", line 121, in test_normalize
 os.stat(name)
OSError: [Errno 2] No such file or directory: '@test_70346_tmp/\xc2\xa8\xcc\x81\xc2\xb4\xe3\x8f\x95'
======================================================================
FAIL: test_listdir (__main__.UnicodeFileTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "Lib/test/test_pep277.py", line 145, in test_listdir
 self.assertEqual(len(f1), len(self.files))
AssertionError: 18 != 19
----------------------------------------------------------------------
Ran 30 tests in 0.292s
FAILED (failures=1, errors=1)
Traceback (most recent call last):
 File "Lib/test/test_pep277.py", line 198, in <module>
 test_main()
 File "Lib/test/test_pep277.py", line 191, in test_main
 UnicodeNFKDFileTests,
 File "/compile/python-trunk/Lib/test/test_support.py", line 1031, in run_unittest
 _run_suite(suite)
 File "/compile/python-trunk/Lib/test/test_support.py", line 1014, in _run_suite
 raise TestFailed(err)
test.test_support.TestFailed: multiple errors occurred

New patch: removed the offending codepoint '\ufad1'.
Please try again on OS X, and windows.

New patch, fixing test_listdir on OS X (hopefully).

Fixed with r79207 (2.x) and r79209 (3.x).
Thank you Michael for testing it.