Fix Teslemetry cruise follow distance on unknown values (#183472)

homeassistant/components/teslemetry/sensor.py

@@ -632,7 +632,11 @@ VEHICLE_DESCRIPTIONS: tuple[TeslemetryVehicleSensorEntityDescription, ...] = (
     TeslemetryVehicleSensorEntityDescription(
         key="cruise_follow_distance",
         streaming_listener=lambda vehicle, callback: (
-            vehicle.listen_CruiseFollowDistance(callback)
+            vehicle.listen_CruiseFollowDistance(
+                lambda value: callback(
+                    int(value) if value and value.isdigit() else None
+                )
+            )
         ),
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.SECONDS,

tests/components/teslemetry/test_sensor.py

@@ -460,6 +460,46 @@ async def test_sensors_streaming_tpms_none_clears_state(
     assert hass.states.get(entity_id).state == STATE_UNKNOWN
 
 
+@pytest.mark.parametrize(
+    "raw_value",
+    [
+        pytest.param("FollowDistanceUnknown", id="unknown"),
+        pytest.param(None, id="none"),
+    ],
+)
+@pytest.mark.usefixtures("entity_registry_enabled_by_default")
+async def test_cruise_follow_distance_unknown(
+    hass: HomeAssistant,
+    mock_vehicle_data: AsyncMock,
+    mock_add_listener: AsyncMock,
+    raw_value: str | None,
+) -> None:
+    """An unknown streamed follow distance must clear the numeric sensor."""
+    entity_id = "sensor.test_cruise_follow_distance"
+    await setup_platform(hass, [Platform.SENSOR])
+    vin = VEHICLE_DATA_ALT["response"]["vin"]
+
+    mock_add_listener.send(
+        {
+            "vin": vin,
+            "data": {Signal.CRUISE_FOLLOW_DISTANCE: "FollowDistance3"},
+            "createdAt": "2024-10-04T10:45:17.537Z",
+        }
+    )
+    await hass.async_block_till_done()
+    assert hass.states.get(entity_id).state == "3"
+
+    mock_add_listener.send(
+        {
+            "vin": vin,
+            "data": {Signal.CRUISE_FOLLOW_DISTANCE: raw_value},
+            "createdAt": "2024-10-04T10:45:18.537Z",
+        }
+    )
+    await hass.async_block_till_done()
+    assert hass.states.get(entity_id).state == STATE_UNKNOWN
+
+
 @pytest.mark.parametrize(
     ("key", "signal", "raw_value", "state"),
     [