[3.13] pythongh-133210: Fix test_rlcompleter in --without-doc-strings mode (pythonGH-133332) (python#133348)

pythongh-133210: Fix `test_rlcompleter` in `--without-doc-strings` mode (pythonGH-133332)
(cherry picked from commit 881144f)

Co-authored-by: sobolevn <mail@sobolevn.me>

Author: miss-islington

Lib/test/test_rlcompleter.py

@@ -54,11 +54,26 @@ def test_attr_matches(self):
                          ['str.{}('.format(x) for x in dir(str)
                           if x.startswith('s')])
         self.assertEqual(self.stdcompleter.attr_matches('tuple.foospamegg'), [])
-        expected = sorted({'None.%s%s' % (x,
-                                          '()' if x in ('__init_subclass__', '__class__')
-                                          else '' if x == '__doc__'
-                                          else '(')
-                           for x in dir(None)})
+
+        def create_expected_for_none():
+            if not MISSING_C_DOCSTRINGS:
+                parentheses = ('__init_subclass__', '__class__')
+            else:
+                # When `--without-doc-strings` is used, `__class__`
+                # won't have a known signature.
+                parentheses = ('__init_subclass__',)
+
+            items = set()
+            for x in dir(None):
+                if x in parentheses:
+                    items.add(f'None.{x}()')
+                elif x == '__doc__':
+                    items.add(f'None.{x}')
+                else:
+                    items.add(f'None.{x}(')
+            return sorted(items)
+
+        expected = create_expected_for_none()
         self.assertEqual(self.stdcompleter.attr_matches('None.'), expected)
         self.assertEqual(self.stdcompleter.attr_matches('None._'), expected)
         self.assertEqual(self.stdcompleter.attr_matches('None.__'), expected)