Merge pull request RustPython#4658 from dalinaum/test_userstring

Update test/test_userstring.py from CPython 3.11.2

Author: youknowone

Lib/test/test_userstring.py

@@ -14,12 +14,6 @@ class UserStringTest(
 
     type2test = UserString
 
-    def test_removeprefix(self):
-        super().test_removeprefix()
-
-    def test_removesuffix(self):
-        super().test_removesuffix()
-
     # Overwrite the three testing methods, because UserString
     # can't cope with arguments propagated to UserString
     # (and we don't test with subclasses)
@@ -33,12 +27,14 @@ def checkequal(self, result, object, methodname, *args, **kwargs):
             realresult
         )
 
-    def checkraises(self, exc, obj, methodname, *args):
+    def checkraises(self, exc, obj, methodname, *args, expected_msg=None):
         obj = self.fixtype(obj)
         # we don't fix the arguments, because UserString can't cope with it
         with self.assertRaises(exc) as cm:
             getattr(obj, methodname)(*args)
         self.assertNotEqual(str(cm.exception), '')
+        if expected_msg is not None:
+            self.assertEqual(str(cm.exception), expected_msg)
 
     def checkcall(self, object, methodname, *args):
         object = self.fixtype(object)