[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/anyio/_backends/_asyncio.py

@@ -56,7 +56,8 @@
     Any,
     Optional,
     TypeVar,
-    cast, Union,
+    Union,
+    cast,
 )
 from weakref import WeakKeyDictionary
 
@@ -692,9 +693,7 @@ def _extract_coro_from_task(self, key: Any) -> Coroutine[Any, Any, Any] | None:
                 if asyncio.iscoroutine(coro):
                     return coro
             except Exception as exc:
-                raise RuntimeError(
-                    "The task's coroutine was not available"
-                ) from exc
+                raise RuntimeError("The task's coroutine was not available") from exc
         return None
 
     def __getitem__(self, key: TaskLike) -> TaskState:

tests/test_taskgroups.py

@@ -1796,7 +1796,7 @@ async def test_nest_asyncio_applied():
     nest_asyncio.apply()
 
     async def coro_task():
-        await sleep(0)
+        await asyncio.lowlevel.checkpoint()
 
     async with create_task_group() as tg:
         tg.start_soon(coro_task)
@@ -1849,7 +1849,7 @@ def get_coro(self):
     original_task = asyncio.Task
 
     async def sample_coro():
-        await sleep(0)
+        await asyncio.lowlevel.checkpoint()
 
     async def task_factory(loop, coro):
         return CustomTask(coro)