Fix flaky ista_ecotrend statistics import test (#183685)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

homeassistant/components/ista_ecotrend/sensor.py

@@ -1,6 +1,5 @@
 """Sensor platform for Ista EcoTrend integration."""
 
-import asyncio
 from dataclasses import dataclass
 import datetime
 from enum import StrEnum
@@ -223,7 +222,9 @@ class IstaSensor(CoordinatorEntity[IstaCoordinator], SensorEntity):
     @override
     def _handle_coordinator_update(self) -> None:
         """Handle coordinator update."""
-        asyncio.run_coroutine_threadsafe(self.update_statistics(), self.hass.loop)
+        self.coordinator.config_entry.async_create_task(
+            self.hass, self.update_statistics()
+        )
 
     async def update_statistics(self) -> None:
         """Import ista EcoTrend historical statistics."""

tests/components/ista_ecotrend/test_statistics.py

@@ -62,11 +62,11 @@ async def test_statistics_import(
 
     freezer.tick(datetime.timedelta(days=1))
     async_fire_time_changed(hass)
-    await hass.async_block_till_done()
+    await hass.async_block_till_done(wait_background_tasks=True)
     await async_wait_recording_done(hass)
     freezer.tick(datetime.timedelta(days=1))
     async_fire_time_changed(hass)
-    await hass.async_block_till_done()
+    await hass.async_block_till_done(wait_background_tasks=True)
     await async_wait_recording_done(hass)
 
     for entity in entities: