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So I changed the test code to:
diff --git a/Lib/test/test_utf8_mode.py b/Lib/test/test_utf8_mode.py
index 26e2e13ec5..d9f8a3ed8b 100644
--- a/Lib/test/test_utf8_mode.py
+++ b/Lib/test/test_utf8_mode.py
@@ -208,7 +208,7 @@ class UTF8ModeTests(unittest.TestCase):
 def test_cmd_line(self):
 arg = 'h\xe9\u20ac'.encode('utf-8')
 arg_utf8 = arg.decode('utf-8')
- arg_ascii = arg.decode('ascii', 'surrogateescape')
+ arg_ascii = arg.decode('roman8', 'surrogateescape')
 code = 'import locale, sys; print("%s:%s" % (locale.getpreferredencoding(), ascii(sys.argv[1:])))'
 def check(utf8_opt, expected, **kw):
and the output is:
======================================================================
FAIL: test_cmd_line (test.test_utf8_mode.UTF8ModeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/var/osipovmi/cpython/Lib/test/test_utf8_mode.py", line 224, in test_cmd_line
 check('utf8=0', [c_arg], LC_ALL='C')
 File "/var/osipovmi/cpython/Lib/test/test_utf8_mode.py", line 217, in check
 self.assertEqual(args, ascii(expected), out)
AssertionError: "['h\\xc3\\xa9\\xe2\\x82\\xac']" != "['h\\xfb\\u02cb\\xe3\\x82\\u02dc']"
- ['h\xc3\xa9\xe2\x82\xac']
+ ['h\xfb\u02cb\xe3\x82\u02dc']
 : roman8:['h\xc3\xa9\xe2\x82\xac']
I still don't understand that.
I believe that surrogate escape only works for ASCII and nothing else. If so, this test must be skipped on HP-UX and AIX.