Add select triggers

homeassistant/components/automation/__init__.py

@@ -155,6 +155,7 @@ _EXPERIMENTAL_TRIGGER_PLATFORMS = {
     "remote",
     "scene",
     "schedule",
+    "select",
     "siren",
     "switch",
     "text",

homeassistant/components/select/icons.json

@@ -20,5 +20,10 @@
     "select_previous": {
       "service": "mdi:format-list-bulleted"
     }
+  },
+  "triggers": {
+    "selection_changed": {
+      "trigger": "mdi:format-list-bulleted"
+    }
   }
 }

homeassistant/components/select/strings.json

@@ -76,5 +76,11 @@
       "name": "Previous"
     }
   },
-  "title": "Select"
+  "title": "Select",
+  "triggers": {
+    "selection_changed": {
+      "description": "Triggers after one or more selections change.",
+      "name": "Selection changed"
+    }
+  }
 }

homeassistant/components/select/trigger.py

@@ -0,0 +1,32 @@
+"""Provides triggers for selects."""
+
+from homeassistant.const import STATE_UNAVAILABLE, STATE_UNKNOWN
+from homeassistant.core import HomeAssistant, State
+from homeassistant.helpers.trigger import (
+    ENTITY_STATE_TRIGGER_SCHEMA,
+    EntityTriggerBase,
+    Trigger,
+)
+
+from .const import DOMAIN
+
+
+class SelectionChangedTrigger(EntityTriggerBase):
+    """Trigger for select entity when its selection changes."""
+
+    _domains = {DOMAIN}
+    _schema = ENTITY_STATE_TRIGGER_SCHEMA
+
+    def is_valid_state(self, state: State) -> bool:
+        """Check if the new state is not invalid."""
+        return state.state not in (STATE_UNAVAILABLE, STATE_UNKNOWN)
+
+
+TRIGGERS: dict[str, type[Trigger]] = {
+    "selection_changed": SelectionChangedTrigger,
+}
+
+
+async def async_get_triggers(hass: HomeAssistant) -> dict[str, type[Trigger]]:
+    """Return the triggers for selects."""
+    return TRIGGERS

homeassistant/components/select/triggers.yaml

@@ -0,0 +1,4 @@
+selection_changed:
+  target:
+    entity:
+      domain: select

tests/components/select/test_trigger.py

@@ -0,0 +1,126 @@
+"""Test select trigger."""
+
+import pytest
+
+from homeassistant.const import (
+    ATTR_LABEL_ID,
+    CONF_ENTITY_ID,
+    STATE_UNAVAILABLE,
+    STATE_UNKNOWN,
+)
+from homeassistant.core import HomeAssistant, ServiceCall
+
+from tests.components import (
+    TriggerStateDescription,
+    arm_trigger,
+    parametrize_target_entities,
+    set_or_remove_state,
+    target_entities,
+)
+
+
+@pytest.fixture
+async def target_selects(hass: HomeAssistant) -> list[str]:
+    """Create multiple select entities associated with different targets."""
+    return (await target_entities(hass, "select"))["included"]
+
+
+@pytest.mark.parametrize("trigger_key", ["select.selection_changed"])
+async def test_select_triggers_gated_by_labs_flag(
+    hass: HomeAssistant, caplog: pytest.LogCaptureFixture, trigger_key: str
+) -> None:
+    """Test the select triggers are gated by the labs flag."""
+    await arm_trigger(hass, trigger_key, None, {ATTR_LABEL_ID: "test_label"})
+    assert (
+        "Unnamed automation failed to setup triggers and has been disabled: Trigger "
+        f"'{trigger_key}' requires the experimental 'New triggers and conditions' "
+        "feature to be enabled in Home Assistant Labs settings (feature flag: "
+        "'new_triggers_conditions')"
+    ) in caplog.text
+
+
+@pytest.mark.usefixtures("enable_labs_preview_features")
+@pytest.mark.parametrize(
+    ("trigger_target_config", "entity_id", "entities_in_target"),
+    parametrize_target_entities("select"),
+)
+@pytest.mark.parametrize(
+    ("trigger", "states"),
+    [
+        (
+            "select.selection_changed",
+            [
+                {"included": {"state": None, "attributes": {}}, "count": 0},
+                {"included": {"state": "option_a", "attributes": {}}, "count": 0},
+                {"included": {"state": "option_b", "attributes": {}}, "count": 1},
+            ],
+        ),
+        (
+            "select.selection_changed",
+            [
+                {"included": {"state": "option_a", "attributes": {}}, "count": 0},
+                {"included": {"state": "option_b", "attributes": {}}, "count": 1},
+                {"included": {"state": "option_c", "attributes": {}}, "count": 1},
+            ],
+        ),
+        (
+            "select.selection_changed",
+            [
+                {
+                    "included": {"state": STATE_UNAVAILABLE, "attributes": {}},
+                    "count": 0,
+                },
+                {"included": {"state": "option_a", "attributes": {}}, "count": 0},
+                {"included": {"state": "option_b", "attributes": {}}, "count": 1},
+                {
+                    "included": {"state": STATE_UNAVAILABLE, "attributes": {}},
+                    "count": 0,
+                },
+            ],
+        ),
+        (
+            "select.selection_changed",
+            [
+                {"included": {"state": STATE_UNKNOWN, "attributes": {}}, "count": 0},
+                {"included": {"state": "option_a", "attributes": {}}, "count": 0},
+                {"included": {"state": "option_b", "attributes": {}}, "count": 1},
+                {"included": {"state": STATE_UNKNOWN, "attributes": {}}, "count": 0},
+            ],
+        ),
+    ],
+)
+async def test_select_state_trigger_behavior_any(
+    hass: HomeAssistant,
+    service_calls: list[ServiceCall],
+    target_selects: list[str],
+    trigger_target_config: dict,
+    entity_id: str,
+    entities_in_target: int,
+    trigger: str,
+    states: list[TriggerStateDescription],
+) -> None:
+    """Test that the select trigger fires when any select state changes."""
+    other_entity_ids = set(target_selects) - {entity_id}
+
+    # Set all selects, including the tested select, to the initial state
+    for eid in target_selects:
+        set_or_remove_state(hass, eid, states[0]["included"])
+        await hass.async_block_till_done()
+
+    await arm_trigger(hass, trigger, None, trigger_target_config)
+
+    for state in states[1:]:
+        included_state = state["included"]
+        set_or_remove_state(hass, entity_id, included_state)
+        await hass.async_block_till_done()
+        assert len(service_calls) == state["count"]
+        for service_call in service_calls:
+            assert service_call.data[CONF_ENTITY_ID] == entity_id
+        service_calls.clear()
+
+        # Check if changing other selects also triggers
+        for other_entity_id in other_entity_ids:
+            set_or_remove_state(hass, other_entity_id, included_state)
+            await hass.async_block_till_done()
+        assert len(service_calls) == (entities_in_target - 1) * state["count"]
+        service_calls.clear()