Add the ability to reload trend platforms from yaml (#39341)

homeassistant/components/trend/__init__.py

@@ -1 +1,4 @@
 """A sensor that monitors trends in other components."""
+
+DOMAIN = "trend"
+PLATFORMS = ["binary_sensor"]

homeassistant/components/trend/binary_sensor.py

@@ -26,8 +26,11 @@ from homeassistant.core import callback
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import generate_entity_id
 from homeassistant.helpers.event import async_track_state_change_event
+from homeassistant.helpers.reload import setup_reload_service
 from homeassistant.util import utcnow
 
+from . import DOMAIN, PLATFORMS
+
 _LOGGER = logging.getLogger(__name__)
 
 ATTR_ATTRIBUTE = "attribute"
@@ -63,6 +66,9 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 
 def setup_platform(hass, config, add_entities, discovery_info=None):
     """Set up the trend sensors."""
+
+    setup_reload_service(hass, DOMAIN, PLATFORMS)
+
     sensors = []
 
     for device_id, device_config in config[CONF_SENSORS].items():
@@ -179,8 +185,10 @@ class SensorTrend(BinarySensorEntity):
             except (ValueError, TypeError) as ex:
                 _LOGGER.error(ex)
 
-        async_track_state_change_event(
-            self.hass, [self._entity_id], trend_sensor_state_listener
+        self.async_on_remove(
+            async_track_state_change_event(
+                self.hass, [self._entity_id], trend_sensor_state_listener
+            )
         )
 
     async def async_update(self):

homeassistant/components/trend/services.yaml

@@ -0,0 +1,2 @@
+reload:
+  description: Reload all trend entities.

tests/components/trend/test_binary_sensor.py

@@ -1,7 +1,10 @@
 """The test for the Trend sensor platform."""
 from datetime import timedelta
+from os import path
 
-from homeassistant import setup
+from homeassistant import config as hass_config, setup
+from homeassistant.components.trend import DOMAIN
+from homeassistant.const import SERVICE_RELOAD
 import homeassistant.util.dt as dt_util
 
 from tests.async_mock import patch
@@ -370,3 +373,47 @@ class TestTrendBinarySensor:
                 self.hass, "binary_sensor", {"binary_sensor": {"platform": "trend"}}
             )
         assert self.hass.states.all() == []
+
+
+async def test_reload(hass):
+    """Verify we can reload trend sensors."""
+    hass.states.async_set("sensor.test_state", 1234)
+
+    await setup.async_setup_component(
+        hass,
+        "binary_sensor",
+        {
+            "binary_sensor": {
+                "platform": "trend",
+                "sensors": {"test_trend_sensor": {"entity_id": "sensor.test_state"}},
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    assert len(hass.states.async_all()) == 2
+
+    assert hass.states.get("binary_sensor.test_trend_sensor")
+
+    yaml_path = path.join(
+        _get_fixtures_base_path(),
+        "fixtures",
+        "trend/configuration.yaml",
+    )
+    with patch.object(hass_config, "YAML_CONFIG_FILE", yaml_path):
+        await hass.services.async_call(
+            DOMAIN,
+            SERVICE_RELOAD,
+            {},
+            blocking=True,
+        )
+        await hass.async_block_till_done()
+
+    assert len(hass.states.async_all()) == 2
+
+    assert hass.states.get("binary_sensor.test_trend_sensor") is None
+    assert hass.states.get("binary_sensor.second_test_trend_sensor")
+
+
+def _get_fixtures_base_path():
+    return path.dirname(path.dirname(path.dirname(__file__)))

tests/fixtures/trend/configuration.yaml

@@ -0,0 +1,5 @@
+binary_sensor:
+  - platform: trend
+    sensors:
+      second_test_trend_sensor:
+        entity_id: sensor.test_state