Remove another thing from the tests and clarify whatsnew

Doc/whatsnew/3.14.rst

@@ -121,9 +121,11 @@ ast
   * :class:`!ast.Ellipsis`
 
   Use :class:`ast.Constant` instead. As a consequence of these removals,
-  ``visit_Num``, ``visit_Str``, ``visit_Bytes``, ``visit_NameConstant`` and
-  ``visit_Ellipsis`` methods will no longer have any effect on
-  :class:`ast.NodeVisitor` subclasses; use ``visit_Constant`` instead.
+  user-defined ``visit_Num``, ``visit_Str``, ``visit_Bytes``,
+  ``visit_NameConstant`` and ``visit_Ellipsis`` methods on custom
+  :class:`ast.NodeVisitor` subclasses will no longer be called when the
+  ``NodeVisitor`` subclass is visiting an AST. Define ``visit_Constant``
+  methods instead.
 
   Also, remove the following deprecated properties on :class:`ast.Constant`,
   which were present for compatibility with the now-removed AST classes:

Lib/test/test_ast.py

@@ -2608,8 +2608,6 @@ def test_source_segment_missing_info(self):
 
 
 class NodeTransformerTests(ASTTestMixin, unittest.TestCase):
-    visitor_class = ast.NodeTransformer
-
     def assertASTTransformation(self, tranformer_class,
                                 initial_code, expected_code):
         initial_ast = ast.parse(dedent(initial_code))