make start_soon always start soon - support eager tasks

tests/conftest.py

@@ -29,42 +29,27 @@
 
 pytest_plugins = ["pytester", "pytest_mock"]
 
-if sys.version_info < (3, 13):
-    if sys.platform == "win32":
-        EventLoop = asyncio.ProactorEventLoop
-    else:
-        EventLoop = asyncio.SelectorEventLoop
-else:
-    EventLoop = asyncio.EventLoop
-
-if sys.version_info >= (3, 12):
-
-    def eager_task_loop_factory() -> EventLoop:
-        loop = EventLoop()
-        loop.set_task_factory(asyncio.eager_task_factory)
-        return loop
-
-    eager_marks: list[pytest.MarkDecorator] = []
-else:
-    eager_task_loop_factory = EventLoop
-    eager_marks = [pytest.mark.skip(reason="eager tasks not supported yet")]
-
 asyncio_params = [
-    pytest.param(
-        ("asyncio", {"debug": True, "loop_factory": None}),
-        id="asyncio",
-    ),
+    pytest.param(("asyncio", {"debug": True}), id="asyncio"),
     pytest.param(
         ("asyncio", {"debug": True, "loop_factory": uvloop.new_event_loop}),
         marks=uvloop_marks,
         id="asyncio+uvloop",
     ),
-    pytest.param(
-        ("asyncio", {"debug": True, "loop_factory": eager_task_loop_factory}),
-        marks=eager_marks,
-        id="asyncio+eager",
-    ),
 ]
+if sys.version_info >= (3, 12):
+
+    def eager_task_loop_factory() -> asyncio.AbstractEventLoop:
+        loop = asyncio.new_event_loop()
+        loop.set_task_factory(asyncio.eager_task_factory)
+        return loop
+
+    asyncio_params.append(
+        pytest.param(
+            ("asyncio", {"debug": True, "loop_factory": eager_task_loop_factory}),
+            id="asyncio+eager",
+        ),
+    )
 
 
 @pytest.fixture(params=[*asyncio_params, pytest.param("trio")])

tests/test_taskgroups.py

@@ -33,7 +33,7 @@
 from anyio.abc import TaskGroup, TaskStatus
 from anyio.lowlevel import checkpoint
 
-from .conftest import EventLoop, asyncio_params
+from .conftest import asyncio_params
 
 if sys.version_info < (3, 11):
     from exceptiongroup import BaseExceptionGroup, ExceptionGroup
@@ -1782,9 +1782,9 @@ async def sync_coro() -> None:
 
     def task_factory_loop_factory_factory(
         task_factory: Callable[..., Any],
-    ) -> Callable[[], EventLoop]:
-        def factory() -> EventLoop:
-            loop = EventLoop()
+    ) -> Callable[[], asyncio.AbstractEventLoop]:
+        def factory() -> asyncio.AbstractEventLoop:
+            loop = asyncio.new_event_loop()
             loop.set_task_factory(task_factory)
             return loop