diff --git a/ipykernel/kernelbase.py b/ipykernel/kernelbase.py
index ad1100d8..3c7324d2 100644
--- a/ipykernel/kernelbase.py
+++ b/ipykernel/kernelbase.py
@@ -552,7 +552,9 @@ async def start(self, *, task_status: TaskStatus = TASK_STATUS_IGNORED) -> None:
                 # Assign tasks to and start shell channel thread.
                 manager = self.shell_channel_thread.manager
                 self.shell_channel_thread.add_task(self.shell_channel_thread_main)
-                self.shell_channel_thread.add_task(manager.listen_from_control, self.shell_main, self.shell_channel_thread)
+                self.shell_channel_thread.add_task(
+                    manager.listen_from_control, self.shell_main, self.shell_channel_thread
+                )
                 self.shell_channel_thread.add_task(manager.listen_from_subshells)
                 self.shell_channel_thread.start()
             else:
@@ -1082,7 +1084,9 @@ async def create_subshell_request(self, socket, ident, parent) -> None:
 
         # This should only be called in the control thread if it exists.
         # Request is passed to shell channel thread to process.
-        other_socket = await self.shell_channel_thread.manager.get_control_other_socket(self.control_thread.get_task_group())
+        other_socket = await self.shell_channel_thread.manager.get_control_other_socket(
+            self.control_thread.get_task_group()
+        )
         await other_socket.asend_json({"type": "create"})
         reply = await other_socket.arecv_json()
 
@@ -1104,7 +1108,9 @@ async def delete_subshell_request(self, socket, ident, parent) -> None:
 
         # This should only be called in the control thread if it exists.
         # Request is passed to shell channel thread to process.
-        other_socket = await self.shell_channel_thread.manager.get_control_other_socket(self.control_thread.get_task_group())
+        other_socket = await self.shell_channel_thread.manager.get_control_other_socket(
+            self.control_thread.get_task_group()
+        )
         await other_socket.asend_json({"type": "delete", "subshell_id": subshell_id})
         reply = await other_socket.arecv_json()
 
@@ -1119,7 +1125,9 @@ async def list_subshell_request(self, socket, ident, parent) -> None:
 
         # This should only be called in the control thread if it exists.
         # Request is passed to shell channel thread to process.
-        other_socket = await self.shell_channel_thread.manager.get_control_other_socket(self.control_thread.get_task_group())
+        other_socket = await self.shell_channel_thread.manager.get_control_other_socket(
+            self.control_thread.get_task_group()
+        )
         await other_socket.asend_json({"type": "list"})
         reply = await other_socket.arecv_json()
 
diff --git a/ipykernel/subshell_manager.py b/ipykernel/subshell_manager.py
index c4530748..dbd3da76 100644
--- a/ipykernel/subshell_manager.py
+++ b/ipykernel/subshell_manager.py
@@ -234,7 +234,9 @@ def _is_subshell(self, subshell_id: str | None) -> bool:
         with self._lock_cache:
             return subshell_id in self._cache
 
-    async def _listen_for_subshell_reply(self, subshell_id: str | None, task_group: TaskGroup) -> None:
+    async def _listen_for_subshell_reply(
+        self, subshell_id: str | None, task_group: TaskGroup
+    ) -> None:
         """Listen for reply messages on specified subshell inproc socket and
         resend to the client via the shell_socket.
 
diff --git a/tests/conftest.py b/tests/conftest.py
index dfa7df5d..c981f867 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -22,10 +22,11 @@
     resource = None  # type:ignore
 
 
-@pytest.fixture
+@pytest.fixture()
 def anyio_backend():
     return "asyncio"
 
+
 pytestmark = pytest.mark.anyio
 
 
diff --git a/tests/test_io.py b/tests/test_io.py
index 1661d3eb..09add95f 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -197,7 +197,7 @@ async def subprocess_test_echo_watch():
 
 
 @pytest.mark.anyio()
-#@pytest.mark.skipif(sys.platform.startswith("win"), reason="Windows")
+# @pytest.mark.skipif(sys.platform.startswith("win"), reason="Windows")
 @pytest.mark.skip(reason="FIXME")
 async def test_echo_watch(ctx):
     """Test echo on underlying FD while capturing the same FD