Make tests more chatty

Author: ambv

Lib/test/test_ntpath.py

@@ -964,12 +964,15 @@ def test_realpath_permission(self):
         # Automatic generation of short names may be disabled on
         # NTFS volumes for the sake of performance.
         # They're not supported at all on ReFS and exFAT.
-        subprocess.run(
+        p = subprocess.run(
             # Try to set the short name manually.
             ['fsutil.exe', 'file', 'setShortName', test_file, 'LONGFI~1.TXT'],
             creationflags=subprocess.DETACHED_PROCESS
         )
 
+        if p.returncode:
+            raise unittest.SkipTest('failed to set short name')
+
         try:
             self.assertPathEqual(test_file, ntpath.realpath(test_file_short))
         except AssertionError:
@@ -988,6 +991,7 @@ def test_realpath_permission(self):
         self.assertPathEqual(test_file, ntpath.realpath(test_file_short))
         with self.assertRaises(OSError):
             ntpath.realpath(test_file_short, strict=True)
+        with self.assertRaises(OSError):
             ntpath.realpath(test_file_short, strict='allow_missing')
 
     def test_expandvars(self):

Lib/test/test_tarfile.py

@@ -3788,6 +3788,10 @@ def test_parent_symlink(self):
     @symlink_test
     def test_realpath_limit_attack(self):
         # (CVE-2025-4517)
+
+        if not os_helper.can_symlink():
+            raise SkipTest('requires symlinking ability')
+
         with ArchiveMaker() as arc:
             # populate the symlinks and dirs that expand in os.path.realpath()
             # The number is chosen so that in common cases, the unexpanded