Fix test_unicode_file errors on platforms without Unicode file support,

by setting TESTFN_UNICODE_UNENCODEABLE on these platforms.
test_unicode_file only attempts to use the name for testing if not None.

Lib/test/test_support.py

@@ -136,22 +136,28 @@ else:
         TESTFN_ENCODING=sys.getfilesystemencoding()
         # TESTFN_UNICODE_UNENCODEABLE is a filename that should *not* be 
         # able to be encoded by *either* the default or filesystem encoding.
-        # Japanese characters (I think - from bug 846133)
-        TESTFN_UNICODE_UNENCODEABLE = u"@test-\u5171\u6709\u3055\u308c\u308b"
-        try:
-            # XXX - Note - should be using TESTFN_ENCODING here - but for
-            # Windows, "mbcs" currently always operates as if in 
-            # errors=ignore' mode - hence we get '?' characters rather than
-            # the exception.  'Latin1' operates as we expect - ie, fails.
-            # See [ 850997 ] mbcs encoding ignores errors
-            TESTFN_UNICODE_UNENCODEABLE.encode("Latin1")
-        except UnicodeEncodeError:
-            pass
+        # This test really only makes sense on Windows NT platforms 
+        # which have special Unicode support in posixmodule.
+        if not hasattr(sys, "getwindowsversion") or \
+           sys.getwindowsversion()[3]<2:
+           TESTFN_UNICODE_UNENCODABLE = None
         else:
-            print \
-            'WARNING: The filename %r CAN be encoded by the filesystem.  ' \
-            'Unicode filename tests may not be effective' \
-            % TESTFN_UNICODE_UNENCODEABLE
+            # Japanese characters (I think - from bug 846133)
+            TESTFN_UNICODE_UNENCODEABLE = u"@test-\u5171\u6709\u3055\u308c\u308b"
+            try:
+                # XXX - Note - should be using TESTFN_ENCODING here - but for
+                # Windows, "mbcs" currently always operates as if in 
+                # errors=ignore' mode - hence we get '?' characters rather than
+                # the exception.  'Latin1' operates as we expect - ie, fails.
+                # See [ 850997 ] mbcs encoding ignores errors
+                TESTFN_UNICODE_UNENCODEABLE.encode("Latin1")
+            except UnicodeEncodeError:
+                pass
+            else:
+                print \
+                'WARNING: The filename %r CAN be encoded by the filesystem.  ' \
+                'Unicode filename tests may not be effective' \
+                % TESTFN_UNICODE_UNENCODEABLE
 
 # Make sure we can write to TESTFN, try in /tmp if we can't
 fp = None

Lib/test/test_unicode_file.py

@@ -140,7 +140,8 @@ class TestUnicodeFiles(unittest.TestCase):
     def test_single_files(self):
         self._test_single(TESTFN_ENCODED)
         self._test_single(TESTFN_UNICODE)
-        self._test_single(TESTFN_UNICODE_UNENCODEABLE)
+        if TESTFN_UNICODE_UNENCODEABLE is not None:
+            self._test_single(TESTFN_UNICODE_UNENCODEABLE)
 
     def test_equivalent_files(self):
         self._test_equivalent(TESTFN_ENCODED, TESTFN_UNICODE)
@@ -156,9 +157,10 @@ class TestUnicodeFiles(unittest.TestCase):
         self._do_directory(TESTFN_UNICODE+ext, TESTFN_ENCODED+ext, os.getcwdu)
         self._do_directory(TESTFN_UNICODE+ext, TESTFN_UNICODE+ext, os.getcwdu)
         # Our directory name that can't use a non-unicode name.
-        self._do_directory(TESTFN_UNICODE_UNENCODEABLE+ext,
-                           TESTFN_UNICODE_UNENCODEABLE+ext,
-                           os.getcwdu)
+        if TESTFN_UNICODE_UNENCODEABLE is not None:
+            self._do_directory(TESTFN_UNICODE_UNENCODEABLE+ext,
+                               TESTFN_UNICODE_UNENCODEABLE+ext,
+                               os.getcwdu)
 
 def test_main():
     suite = unittest.TestSuite()