GH-127807: pathlib ABCs: remove `PathBase._unsupported_msg()` (#127855)

This method helped us customise the `UnsupportedOperation` message
depending on the type. But we're aiming to make `PathBase` a proper ABC
soon, so `NotImplementedError` is the right exception to raise there.

2 files changed, 11 insertions, 9 deletions

diff --git a/Lib/test/test_pathlib/test_pathlib.py b/Lib/test/test_pathlib/test_pathlib.py
index b57ef42..68bff2c 100644
--- a/Lib/test/test_pathlib/test_pathlib.py
+++ b/Lib/test/test_pathlib/test_pathlib.py
@@ -63,6 +63,14 @@ def needs_symlinks(fn):
     _tests_needing_symlinks.add(fn.__name__)
     return fn
 
+
+
+class UnsupportedOperationTest(unittest.TestCase):
+    def test_is_notimplemented(self):
+        self.assertTrue(issubclass(pathlib.UnsupportedOperation, NotImplementedError))
+        self.assertTrue(isinstance(pathlib.UnsupportedOperation(), NotImplementedError))
+
+
 #
 # Tests for the pure classes.
 #
diff --git a/Lib/test/test_pathlib/test_pathlib_abc.py b/Lib/test/test_pathlib/test_pathlib_abc.py
index d770b87..e230dd1 100644
--- a/Lib/test/test_pathlib/test_pathlib_abc.py
+++ b/Lib/test/test_pathlib/test_pathlib_abc.py
@@ -5,7 +5,7 @@ import errno
 import stat
 import unittest
 
-from pathlib._abc import UnsupportedOperation, PurePathBase, PathBase
+from pathlib._abc import PurePathBase, PathBase
 from pathlib._types import Parser
 import posixpath
 
@@ -27,11 +27,6 @@ def needs_windows(fn):
     return fn
 
 
-class UnsupportedOperationTest(unittest.TestCase):
-    def test_is_notimplemented(self):
-        self.assertTrue(issubclass(UnsupportedOperation, NotImplementedError))
-        self.assertTrue(isinstance(UnsupportedOperation(), NotImplementedError))
-
 #
 # Tests for the pure classes.
 #
@@ -1294,10 +1289,9 @@ class DummyPurePathTest(unittest.TestCase):
 class PathBaseTest(PurePathBaseTest):
     cls = PathBase
 
-    def test_unsupported_operation(self):
-        P = self.cls
+    def test_not_implemented_error(self):
         p = self.cls('')
-        e = UnsupportedOperation
+        e = NotImplementedError
         self.assertRaises(e, p.stat)
         self.assertRaises(e, p.exists)
         self.assertRaises(e, p.is_dir)