Add state_class to ring battery sensor for LTS (#109872)

* Add state_class to ring battery sensor for LTS

* Add test, in test_sensor.py, for state_class for battery entity; in response to comment in PR

homeassistant/components/ring/sensor.py

@@ -10,6 +10,7 @@
     SensorDeviceClass,
     SensorEntity,
     SensorEntityDescription,
+    SensorStateClass,
 )
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
@@ -162,6 +163,7 @@ class RingSensorEntityDescription(SensorEntityDescription, RingRequiredKeysMixin
         category=["doorbots", "authorized_doorbots", "stickup_cams"],
         native_unit_of_measurement=PERCENTAGE,
         device_class=SensorDeviceClass.BATTERY,
+        state_class=SensorStateClass.MEASUREMENT,
         entity_category=EntityCategory.DIAGNOSTIC,
         cls=RingSensor,
     ),

tests/components/ring/test_sensor.py

@@ -5,6 +5,7 @@
 import requests_mock
 
 from homeassistant.components.ring.const import SCAN_INTERVAL
+from homeassistant.components.sensor import ATTR_STATE_CLASS, SensorStateClass
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 
@@ -22,10 +23,17 @@ async def test_sensor(hass: HomeAssistant, requests_mock: requests_mock.Mocker)
     front_battery_state = hass.states.get("sensor.front_battery")
     assert front_battery_state is not None
     assert front_battery_state.state == "80"
+    assert (
+        front_battery_state.attributes[ATTR_STATE_CLASS] == SensorStateClass.MEASUREMENT
+    )
 
     front_door_battery_state = hass.states.get("sensor.front_door_battery")
     assert front_door_battery_state is not None
     assert front_door_battery_state.state == "100"
+    assert (
+        front_door_battery_state.attributes[ATTR_STATE_CLASS]
+        == SensorStateClass.MEASUREMENT
+    )
 
     downstairs_volume_state = hass.states.get("sensor.downstairs_volume")
     assert downstairs_volume_state is not None