https://github.com/pexpect/pexpect/commit/456bc10d94b57e254568e7ea9a8b3cffb856ebff

From 456bc10d94b57e254568e7ea9a8b3cffb856ebff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= <miro@hroncok.cz>
Date: Fri, 22 Nov 2024 16:41:55 +0100
Subject: [PATCH] Tests: Avoid the multiprocessing forkserver method

Fixes https://github.com/pexpect/pexpect/issues/807
---
 tests/test_expect.py | 12 ++++++++++--
 tests/test_socket.py | 24 ++++++++++++++++--------
 2 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/tests/test_expect.py b/tests/test_expect.py
index c16e0551..fb1e30e2 100755
--- a/tests/test_expect.py
+++ b/tests/test_expect.py
@@ -33,6 +33,14 @@
 
 PY3 = bool(sys.version_info.major >= 3)
 
+# Python 3.14 changed the non-macOS POSIX default to forkserver
+# but the code in this module does not work with it
+# See https://github.com/python/cpython/issues/125714
+if multiprocessing.get_start_method() == 'forkserver':
+    mp_context = multiprocessing.get_context(method='fork')
+else:
+    mp_context = multiprocessing.get_context()
+
 # Many of these test cases blindly assume that sequential directory
 # listings of the /bin directory will yield the same results.
 # This may not be true, but seems adequate for testing now.
@@ -682,7 +690,7 @@ def test_stdin_closed(self):
         '''
         Ensure pexpect continues to operate even when stdin is closed
         '''
-        class Closed_stdin_proc(multiprocessing.Process):
+        class Closed_stdin_proc(mp_context.Process):
             def run(self):
                 sys.__stdin__.close()
                 cat = pexpect.spawn('cat')
@@ -698,7 +706,7 @@ def test_stdin_stdout_closed(self):
         '''
         Ensure pexpect continues to operate even when stdin and stdout is closed
         '''
-        class Closed_stdin_stdout_proc(multiprocessing.Process):
+        class Closed_stdin_stdout_proc(mp_context.Process):
             def run(self):
                 sys.__stdin__.close()
                 sys.__stdout__.close()
diff --git a/tests/test_socket.py b/tests/test_socket.py
index b801b00a..6521d368 100644
--- a/tests/test_socket.py
+++ b/tests/test_socket.py
@@ -29,6 +29,14 @@
 import time
 import errno
 
+# Python 3.14 changed the non-macOS POSIX default to forkserver
+# but the code in this module does not work with it
+# See https://github.com/python/cpython/issues/125714
+if multiprocessing.get_start_method() == 'forkserver':
+    mp_context = multiprocessing.get_context(method='fork')
+else:
+    mp_context = multiprocessing.get_context()
+
 
 class SocketServerError(Exception):
     pass
@@ -83,8 +91,8 @@ def setUp(self):
         self.prompt3 = b'Press X to exit:'
         self.enter = b'\r\n'
         self.exit = b'X\r\n'
-        self.server_up = multiprocessing.Event()
-        self.server_process = multiprocessing.Process(target=self.socket_server, args=(self.server_up,))
+        self.server_up = mp_context.Event()
+        self.server_process = mp_context.Process(target=self.socket_server, args=(self.server_up,))
         self.server_process.daemon = True
         self.server_process.start()
         counter = 0
@@ -189,9 +197,9 @@ def test_timeout(self):
             session.expect(b'Bogus response')
 
     def test_interrupt(self):
-        timed_out = multiprocessing.Event()
-        all_read = multiprocessing.Event()
-        test_proc = multiprocessing.Process(target=self.socket_fn, args=(timed_out, all_read))
+        timed_out = mp_context.Event()
+        all_read = mp_context.Event()
+        test_proc = mp_context.Process(target=self.socket_fn, args=(timed_out, all_read))
         test_proc.daemon = True
         test_proc.start()
         while not all_read.is_set():
@@ -203,9 +211,9 @@ def test_interrupt(self):
         self.assertEqual(test_proc.exitcode, errno.ETIMEDOUT)
 
     def test_multiple_interrupts(self):
-        timed_out = multiprocessing.Event()
-        all_read = multiprocessing.Event()
-        test_proc = multiprocessing.Process(target=self.socket_fn, args=(timed_out, all_read))
+        timed_out = mp_context.Event()
+        all_read = mp_context.Event()
+        test_proc = mp_context.Process(target=self.socket_fn, args=(timed_out, all_read))
         test_proc.daemon = True
         test_proc.start()
         while not all_read.is_set():