Added changes to make the test suite pass on Python 3.14

apscheduler/executors/pool.py

@@ -1,5 +1,5 @@
 import concurrent.futures
-import multiprocessing
+import sys
 from abc import abstractmethod
 from concurrent.futures.process import BrokenProcessPool
 
@@ -73,6 +73,12 @@ class ProcessPoolExecutor(BasePoolExecutor):
 
     def __init__(self, max_workers=10, pool_kwargs=None):
         pool_kwargs = pool_kwargs or {}
-        pool_kwargs.setdefault("mp_context", multiprocessing.get_context("spawn"))
+
+        # On Python 3.14, "spawn" is the default mp_context
+        if sys.version_info < (3, 14):
+            import multiprocessing
+
+            pool_kwargs.setdefault("mp_context", multiprocessing.get_context("spawn"))
+
         pool = concurrent.futures.ProcessPoolExecutor(int(max_workers), **pool_kwargs)
         super().__init__(pool)

pyproject.toml

@@ -50,10 +50,12 @@ tornado = ["tornado >= 4.3"]
 twisted = ["twisted"]
 zookeeper = ["kazoo"]
 test = [
-    "APScheduler[gevent,mongodb,redis,rethinkdb,sqlalchemy,tornado,twisted,zookeeper,etcd]",
+    "APScheduler[mongodb,redis,rethinkdb,sqlalchemy,tornado,zookeeper,etcd]",
     "pytest",
     "pytest-asyncio >= 0.24.0",
-    "PySide6; python_implementation == 'CPython'",
+    "PySide6; python_implementation == 'CPython' and python_version < '3.14'",
+    "gevent; python_version < '3.14'",
+    "twisted; python_version < '3.14'",
 ]
 doc = [
     "APScheduler[gevent,mongodb,redis,rethinkdb,sqlalchemy,tornado,twisted,zookeeper,etcd]",
@@ -134,7 +136,7 @@ ignore = [
 known-first-party = ["apscheduler"]
 
 [tool.tox]
-env_list = ["py38", "py39", "py310", "py311", "py312", "py313", "pypy3"]
+env_list = ["py38", "py39", "py310", "py311", "py312", "py313", "py314", "pypy3"]
 skip_missing_interpreters = true
 
 [tool.tox.env_run_base]