Add system option to disable polling (#51299)

tests/helpers/test_entity_platform.py

@@ -57,6 +57,19 @@ async def test_polling_only_updates_entities_it_should_poll(hass):
     assert poll_ent.async_update.called
 
 
+async def test_polling_disabled_by_config_entry(hass):
+    """Test the polling of only updated entities."""
+    entity_platform = MockEntityPlatform(hass)
+    entity_platform.config_entry = MockConfigEntry(
+        system_options={"disable_polling": True}
+    )
+
+    poll_ent = MockEntity(should_poll=True)
+
+    await entity_platform.async_add_entities([poll_ent])
+    assert entity_platform._async_unsub_polling is None
+
+
 async def test_polling_updates_entities_with_exception(hass):
     """Test the updated entities that not break with an exception."""
     component = EntityComponent(_LOGGER, DOMAIN, hass, timedelta(seconds=20))