Add unique_id to the statistics component (#59205)

* Implement optional manually defined uniqueid

* Fix test case via mocked environment

homeassistant/components/statistics/sensor.py

@@ -17,6 +17,7 @@ from homeassistant.const import (
     ATTR_UNIT_OF_MEASUREMENT,
     CONF_ENTITY_ID,
     CONF_NAME,
+    CONF_UNIQUE_ID,
     STATE_UNAVAILABLE,
     STATE_UNKNOWN,
 )
@@ -115,6 +116,7 @@ _PLATFORM_SCHEMA_BASE = PLATFORM_SCHEMA.extend(
     {
         vol.Required(CONF_ENTITY_ID): cv.entity_id,
         vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+        vol.Optional(CONF_UNIQUE_ID): cv.string,
         vol.Optional(CONF_STATE_CHARACTERISTIC, default=STAT_DEFAULT): vol.In(
             [
                 STAT_AVERAGE_LINEAR,
@@ -170,6 +172,7 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
             StatisticsSensor(
                 source_entity_id=config.get(CONF_ENTITY_ID),
                 name=config.get(CONF_NAME),
+                unique_id=config.get(CONF_UNIQUE_ID),
                 state_characteristic=config.get(CONF_STATE_CHARACTERISTIC),
                 samples_max_buffer_size=config.get(CONF_SAMPLES_MAX_BUFFER_SIZE),
                 samples_max_age=config.get(CONF_MAX_AGE),
@@ -190,6 +193,7 @@ class StatisticsSensor(SensorEntity):
         self,
         source_entity_id,
         name,
+        unique_id,
         state_characteristic,
         samples_max_buffer_size,
         samples_max_age,
@@ -201,6 +205,7 @@ class StatisticsSensor(SensorEntity):
         self._source_entity_id = source_entity_id
         self.is_binary = self._source_entity_id.split(".")[0] == "binary_sensor"
         self._name = name
+        self._unique_id = unique_id
         self._state_characteristic = state_characteristic
         if self._state_characteristic == STAT_DEFAULT:
             self._state_characteristic = STAT_COUNT if self.is_binary else STAT_MEAN
@@ -335,6 +340,11 @@ class StatisticsSensor(SensorEntity):
         """Return the name of the sensor."""
         return self._name
 
+    @property
+    def unique_id(self):
+        """Return the unique id of the sensor."""
+        return self._unique_id
+
     @property
     def state_class(self):
         """Return the state class of this entity."""

tests/components/statistics/test_sensor.py

@@ -17,6 +17,7 @@ from homeassistant.const import (
     STATE_UNKNOWN,
     TEMP_CELSIUS,
 )
+from homeassistant.helpers import entity_registry as er
 from homeassistant.setup import async_setup_component, setup_component
 from homeassistant.util import dt as dt_util
 
@@ -35,6 +36,29 @@ def mock_legacy_time(legacy_patchable_time):
     yield
 
 
+async def test_unique_id(hass):
+    """Test configuration defined unique_id."""
+    assert await async_setup_component(
+        hass,
+        "sensor",
+        {
+            "sensor": [
+                {
+                    "platform": "statistics",
+                    "name": "test",
+                    "entity_id": "sensor.test_monitored",
+                    "unique_id": "uniqueid_sensor_test",
+                },
+            ]
+        },
+    )
+    await hass.async_block_till_done()
+
+    entity_reg = er.async_get(hass)
+    entity_id = entity_reg.async_get_entity_id("sensor", DOMAIN, "uniqueid_sensor_test")
+    assert entity_id == "sensor.test"
+
+
 class TestStatisticsSensor(unittest.TestCase):
     """Test the Statistics sensor."""