gh-130474: Create and implement flaky resource

Lib/test/_test_multiprocessing.py

@@ -39,6 +39,7 @@
 from test.support import socket_helper
 from test.support import threading_helper
 from test.support import warnings_helper
+from test.support import requires_resource
 
 
 # Skip tests if _multiprocessing wasn't built.

Lib/test/libregrtest/utils.py

@@ -33,7 +33,7 @@
 
 
 ALL_RESOURCES = ('audio', 'curses', 'largefile', 'network',
-                 'decimal', 'cpu', 'subprocess', 'urlfetch', 'gui', 'walltime')
+                 'decimal', 'cpu', 'subprocess', 'urlfetch', 'gui', 'walltime', 'flaky')
 
 # Other resources excluded from --use=all:
 #

Lib/test/test_glob.py

@@ -8,6 +8,7 @@
 
 from test import support
 from test.support import is_wasi, Py_DEBUG
+from test.support import requires_resource
 from test.support.os_helper import (TESTFN, skip_unless_symlink,
                                     can_symlink, create_empty_file, change_cwd)
 
@@ -521,7 +522,7 @@ class SymlinkLoopGlobTests(unittest.TestCase):
     # gh-109959: On Linux, glob._isdir() and glob._lexists() can return False
     # randomly when checking the "link/" symbolic link.
     # https://github.com/python/cpython/issues/109959#issuecomment-2577550700
-    @unittest.skip("flaky test")
+    @support.requires_resource('flaky')
     def test_selflink(self):
         tempdir = TESTFN + "_dir"
         os.makedirs(tempdir)

Lib/test/test_signal.py

@@ -13,6 +13,7 @@
 import time
 import unittest
 from test import support
+from test.support import requires_resource
 from test.support import (
     is_apple, is_apple_mobile, os_helper, threading_helper
 )
@@ -1353,6 +1354,7 @@ def handler(signum, frame):
     @unittest.skipUnless(hasattr(signal, "SIGUSR1"),
                          "test needs SIGUSR1")
     @threading_helper.requires_working_threading()
+    @support.requires_resource('flaky')
     def test_stress_modifying_handlers(self):
         # bpo-43406: race condition between trip_signal() and signal.signal
         signum = signal.SIGUSR1

Lib/test/test_smtplib.py

@@ -23,6 +23,7 @@
 from test.support import threading_helper
 from test.support import asyncore
 from test.support import smtpd
+from test.support import requires_resource
 from unittest.mock import Mock
 
 
@@ -374,6 +375,7 @@ def testHELP(self):
                                       b'RCPT DATA RSET NOOP QUIT VRFY')
         smtp.quit()
 
+    @support.requires_resource('flaky')
     def testSend(self):
         # connect and send mail
         m = 'A test message'

Misc/NEWS.d/next/Tests/2025-02-23-21-20-52.gh-issue-130474.dEckCL.rst

@@ -0,0 +1 @@
+Created flaky resource for flagging tests with flaky outcomes using the support.required_resource() decorator. Flagged some initial tests based on-inline comments. This resource can be used to automate re-running certain tests in CI.