Add a test to check that no old msgid or symbol are used (#5839)

* Add deleted msgid and symbol from the Python 3K+ checker and other deleted checks.

See https://github.com/PyCQA/pylint/pull/4942

Closes #5729

Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/script/get_unused_message_id_category.py b/script/get_unused_message_id_category.py
index 2741148c0..95d7ac3e3 100644
--- a/script/get_unused_message_id_category.py
+++ b/script/get_unused_message_id_category.py
@@ -5,6 +5,7 @@
 from typing import List
 
 from pylint.checkers import initialize as initialize_checkers
+from pylint.constants import DELETED_MSGID_PREFIXES
 from pylint.extensions import initialize as initialize_extensions
 from pylint.lint.pylinter import PyLinter
 
@@ -18,6 +19,8 @@ def register_all_checkers_and_plugins(linter: "PyLinter") -> None:
 
 def get_next_code_category(message_ids: List[str]) -> int:
     categories = sorted({int(i[:2]) for i in message_ids})
+    # We add the prefixes for deleted checkers
+    categories += DELETED_MSGID_PREFIXES
     for i in categories:
         if i + 1 not in categories:
             return i + 1