add sleep to test

src/textual/pilot.py

@@ -40,6 +40,9 @@ class Pilot:
         Args:
             delay (float, optional): Seconds to pause. Defaults to 50ms.
         """
+        # These sleep zeros, are to force asyncio to give up a time-slice,
+        # So that any pending coroutines have ran
+        await asyncio.sleep(0)
         await asyncio.sleep(delay)
         await asyncio.sleep(0)
 

tests/test_animation.py

@@ -29,6 +29,7 @@ async def test_animate_height() -> None:
         assert static.size.height == 1
         static.styles.animate("height", 100, duration=0.5, easing="linear")
         start = time()
+
         # Wait for half the animation
         await pilot.pause(0.25)
         # Check we reached the half way point