py313: Suppress cheroot warnings

https://github.com/cherrypy/cheroot/issues/734
See #8205

tests/end2end/fixtures/webserver_sub.py

@@ -12,6 +12,7 @@ parameters or headers with the same name properly.
 """
 
 import sys
+import errno
 import json
 import time
 import threading
@@ -338,7 +339,26 @@ class WSGIServer(cheroot.wsgi.Server):
         self._ready = value
 
 
+def unraisable_hook(unraisable: "sys.UnraisableHookArgs") -> None:
+    if (
+        sys.version_info[:2] == (3, 13)
+        and isinstance(unraisable.exc_value, OSError)
+        and unraisable.exc_value.errno == errno.EBADF
+        and unraisable.object.__qualname__ == "IOBase.__del__"
+    ):
+        # WORKAROUND for bogus exceptions with cheroot:
+        # https://github.com/cherrypy/cheroot/issues/734
+        return
+    sys.__unraisablehook__(unraisable)
+
+
+def init_unraisable_hook() -> None:
+    sys.unraisablehook = unraisable_hook
+
+
 def main():
+    init_unraisable_hook()
+
     app.template_folder = END2END_DIR / 'templates'
     assert app.template_folder.is_dir(), app.template_folder
 

tests/end2end/fixtures/webserver_sub_ssl.py

@@ -47,6 +47,8 @@ def log_request(response):
 
 
 def main():
+    webserver_sub.init_unraisable_hook()
+
     port = int(sys.argv[1])
     server = webserver_sub.WSGIServer(('127.0.0.1', port), app)