Handle powerConsumption reports with null value (#53888)

homeassistant/components/smartthings/sensor.py

@@ -554,6 +554,8 @@ class SmartThingsPowerConsumptionSensor(SmartThingsEntity, SensorEntity):
         """Init the class."""
         super().__init__(device)
         self.report_name = report_name
+        # This is an exception for STATE_CLASS_MEASUREMENT per @balloob
+        self._attr_state_class = STATE_CLASS_MEASUREMENT
 
     @property
     def name(self) -> str:
@@ -569,7 +571,7 @@ class SmartThingsPowerConsumptionSensor(SmartThingsEntity, SensorEntity):
     def state(self):
         """Return the state of the sensor."""
         value = self._device.status.attributes[Attribute.power_consumption].value
-        if value.get(self.report_name) is None:
+        if value is None or value.get(self.report_name) is None:
             return None
         if self.report_name == "power":
             return value[self.report_name]
@@ -588,3 +590,10 @@ class SmartThingsPowerConsumptionSensor(SmartThingsEntity, SensorEntity):
         if self.report_name == "power":
             return POWER_WATT
         return ENERGY_KILO_WATT_HOUR
+
+    @property
+    def last_reset(self) -> datetime | None:
+        """Return the time when the sensor was last reset, if any."""
+        if self.report_name != "power":
+            return utc_from_timestamp(0)
+        return None

tests/components/smartthings/test_sensor.py

@@ -187,6 +187,28 @@ async def test_power_consumption_sensor(hass, device_factory):
     assert entry.model == device.device_type_name
     assert entry.manufacturer == "Unavailable"
 
+    device = device_factory(
+        "vacuum",
+        [Capability.power_consumption_report],
+        {Attribute.power_consumption: {}},
+    )
+    entity_registry = er.async_get(hass)
+    device_registry = dr.async_get(hass)
+    # Act
+    await setup_platform(hass, SENSOR_DOMAIN, devices=[device])
+    # Assert
+    state = hass.states.get("sensor.vacuum_energy")
+    assert state
+    assert state.state == "unknown"
+    entry = entity_registry.async_get("sensor.vacuum_energy")
+    assert entry
+    assert entry.unique_id == f"{device.device_id}.energy"
+    entry = device_registry.async_get_device({(DOMAIN, device.device_id)})
+    assert entry
+    assert entry.name == device.label
+    assert entry.model == device.device_type_name
+    assert entry.manufacturer == "Unavailable"
+
 
 async def test_update_from_signal(hass, device_factory):
     """Test the binary_sensor updates when receiving a signal."""