skip test_macostools when UCS4 is enabled

Lib/test/regrtest.py

@@ -1133,6 +1133,9 @@ class _ExpectedSkips:
                             "test_applesingle"]
                 for skip in MAC_ONLY:
                     self.expected.add(skip)
+            elif len(u'\0'.encode('unicode-internal')) == 4:
+                self.expected.add("test_macostools")
+
 
             if sys.platform != "win32":
                 # test_sqlite is only reliable on Windows where the library

Lib/test/test_macostools.py

@@ -91,6 +91,9 @@ class TestMacostools(unittest.TestCase):
 
 
 def test_main():
+    # Skip on wide unicode
+    if len(u'\0'.encode('unicode-internal')) == 4:
+        raise test_support.TestSkipped("test_macostools is broken in USC4")
     test_support.run_unittest(TestMacostools)