https://github.com/bleachbit/bleachbit/commit/3d6099e59d9aef25d31e725de2c5e58f7beb9b4e

Modified to apply as a backport

From 3d6099e59d9aef25d31e725de2c5e58f7beb9b4e Mon Sep 17 00:00:00 2001
From: Andrew Ziem <ahz001@gmail.com>
Date: Thu, 5 Feb 2026 21:24:47 -0700
Subject: [PATCH] Fix and test Python 3.14+pyttest

--- a/tests/TestGUI.py
+++ b/tests/TestGUI.py
@@ -24,8 +24,10 @@
 """
 
 import os
+import sys
 import unittest
 import time
 import types
+import warnings
 from unittest import mock
 
@@ -86,7 +80,22 @@ def tearDownClass(cls):
     @classmethod
     def refresh_gui(cls, delay=0):
         while Gtk.events_pending():
-            Gtk.main_iteration_do(blocking=False)
+            if sys.version_info >= (3, 14):
+                with warnings.catch_warnings():
+                    warnings.simplefilter("error")
+                    warnings.filterwarnings(
+                        "ignore",
+                        message=".*asyncio.AbstractEventLoopPolicy.*",
+                        category=DeprecationWarning
+                    )
+                    warnings.filterwarnings(
+                        "ignore",
+                        message=".*asyncio.get_event_loop_policy.*",
+                        category=DeprecationWarning
+                    )
+                    Gtk.main_iteration_do(blocking=False)
+            else:
+                Gtk.main_iteration_do(blocking=False)
         time.sleep(delay)
 
     @classmethod
--- a/tests/TestGuiChaff.py
+++ b/tests/TestGuiChaff.py
@@ -27,6 +27,8 @@
 import tempfile
 import time
 import unittest
+import warnings
+import sys
 from unittest.mock import patch, MagicMock
 
 from tests import common
@@ -64,7 +66,22 @@ def setUpClass(cls):
     @classmethod
     def refresh_gui(cls, delay=0):
         while Gtk.events_pending():
-            Gtk.main_iteration_do(blocking=False)
+            if sys.version_info >= (3, 14):
+                with warnings.catch_warnings():
+                    warnings.simplefilter("error")
+                    warnings.filterwarnings(
+                        "ignore",
+                        message=".*asyncio.AbstractEventLoopPolicy.*",
+                        category=DeprecationWarning
+                    )
+                    warnings.filterwarnings(
+                        "ignore",
+                        message=".*asyncio.get_event_loop_policy.*",
+                        category=DeprecationWarning
+                    )
+                    Gtk.main_iteration_do(blocking=False)
+            else:
+                Gtk.main_iteration_do(blocking=False)
         time.sleep(delay)
 
     def setUp(self):