Update Coordinator: Only schedule a refresh if listenerrs (#34317)

homeassistant/helpers/update_coordinator.py

@@ -170,6 +170,7 @@ class DataUpdateCoordinator:
                 self.name,
                 monotonic() - start,
             )
+            if self._listeners:
                 self._schedule_refresh()
 
         for update_callback in self._listeners:

tests/helpers/test_update_coordinator.py

@@ -41,6 +41,8 @@ async def test_async_refresh(crd):
     await crd.async_refresh()
     assert crd.data == 1
     assert crd.last_update_success is True
+    # Make sure we didn't schedule a refresh because we have 0 listeners
+    assert crd._unsub_refresh is None
 
     updates = []
 
@@ -50,6 +52,7 @@ async def test_async_refresh(crd):
     unsub = crd.async_add_listener(update_callback)
     await crd.async_refresh()
     assert updates == [2]
+    assert crd._unsub_refresh is not None
 
     # Test unsubscribing through function
     unsub()