diff --git a/tests/test_dark_toggle.py b/tests/test_dark_toggle.py
index a6d7e3ddf..cbceb766c 100644
--- a/tests/test_dark_toggle.py
+++ b/tests/test_dark_toggle.py
@@ -1,27 +1,32 @@
 from textual.app import App
 
+
 class OnLoadDarkSwitch(App[None]):
     """App for testing toggling dark mode in on_load."""
 
     def on_load(self) -> None:
         self.dark = not self.dark
 
+
 async def test_toggle_dark_on_load() -> None:
     """It should be possible to toggle dark mode in on_load."""
     async with OnLoadDarkSwitch().run_test() as pilot:
         assert not pilot.app.dark
 
+
 class OnMountDarkSwitch(App[None]):
     """App for testing toggling dark mode in on_mount."""
 
     def on_mount(self) -> None:
         self.dark = not self.dark
 
+
 async def test_toggle_dark_on_mount() -> None:
     """It should be possible to toggle dark mode in on_mount."""
     async with OnMountDarkSwitch().run_test() as pilot:
         assert not pilot.app.dark
 
+
 class ActionDarkSwitch(App[None]):
     """App for testing toggling dark mode from an action."""
 
@@ -30,6 +35,7 @@ class ActionDarkSwitch(App[None]):
     def action_toggle(self) -> None:
         self.dark = not self.dark
 
+
 async def test_toggle_dark_in_action() -> None:
     """It should be possible to toggle dark mode with an action."""
     async with OnMountDarkSwitch().run_test() as pilot: