@@ -0,0 +1,43 @@
+import contextlib
+import sys
+import types
+import warnings
+
+from test.support import warnings_helper as orig
+
+
+@contextlib.contextmanager
+def ignore_warnings(*, category, message=''):
+    """Decorator to suppress warnings.
+
+    Can also be used as a context manager. This is not preferred,
+    because it makes diffs more noisy and tools like 'git blame' less useful.
+    But, it's useful for async functions.
+    """
+    with warnings.catch_warnings():
+        warnings.filterwarnings('ignore', category=category, message=message)
+        yield
+
+
+@contextlib.contextmanager
+def ignore_fork_in_thread_deprecation_warnings():
+    """Suppress deprecation warnings related to forking in multi-threaded code.
+
+    See gh-135427
+
+    Can be used as decorator (preferred) or context manager.
+    """
+    with ignore_warnings(
+        message=".*fork.*may lead to deadlocks in the child.*",
+        category=DeprecationWarning,
+    ):
+        yield
+
+
+if sys.version_info >= (3, 15):
+    warnings_helper = orig
+else:
+    warnings_helper = types.SimpleNamespace(
+        ignore_fork_in_thread_deprecation_warnings=ignore_fork_in_thread_deprecation_warnings,
+        **vars(orig),
+    )
@@ -14,6 +14,7 @@
 )
 
 from . import fixtures
+from .compat.py314 import warnings_helper
 
 
 class TestZip(fixtures.ZipFixtures, unittest.TestCase):
@@ -50,6 +51,7 @@ def test_one_distribution(self):
         dists = list(distributions(path=sys.path[:1]))
         assert len(dists) == 1
 
+    @warnings_helper.ignore_fork_in_thread_deprecation_warnings()
     @unittest.skipUnless(
         hasattr(os, 'register_at_fork')
         and 'fork' in multiprocessing.get_all_start_methods(),