Wake word entity state/category fix (#98886)

* Only change wake word entity state on detection

* Wake word entity is diagnostic

homeassistant/components/wake_word/__init__.py

@@ -7,7 +7,7 @@ import logging
 from typing import final
 
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import STATE_UNAVAILABLE, STATE_UNKNOWN
+from homeassistant.const import STATE_UNAVAILABLE, STATE_UNKNOWN, EntityCategory
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import config_validation as cv
 from homeassistant.helpers.entity_component import EntityComponent
@@ -71,16 +71,17 @@ async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
 class WakeWordDetectionEntity(RestoreEntity):
     """Represent a single wake word provider."""
 
+    _attr_entity_category = EntityCategory.DIAGNOSTIC
     _attr_should_poll = False
-    __last_processed: str | None = None
+    __last_detected: str | None = None
 
     @property
     @final
     def state(self) -> str | None:
         """Return the state of the entity."""
-        if self.__last_processed is None:
+        if self.__last_detected is None:
             return None
-        return self.__last_processed
+        return self.__last_detected
 
     @property
     @abstractmethod
@@ -103,9 +104,13 @@ class WakeWordDetectionEntity(RestoreEntity):
 
         Audio must be 16Khz sample rate with 16-bit mono PCM samples.
         """
-        self.__last_processed = dt_util.utcnow().isoformat()
+        result = await self._async_process_audio_stream(stream)
-        self.async_write_ha_state()
+        if result is not None:
-        return await self._async_process_audio_stream(stream)
+            # Update last detected only when there is a detection
+            self.__last_detected = dt_util.utcnow().isoformat()
+            self.async_write_ha_state()
+
+        return result
 
     async def async_internal_added_to_hass(self) -> None:
         """Call when the entity is added to hass."""
@@ -116,4 +121,4 @@ class WakeWordDetectionEntity(RestoreEntity):
             and state.state is not None
             and state.state not in (STATE_UNAVAILABLE, STATE_UNKNOWN)
         ):
-            self.__last_processed = state.state
+            self.__last_detected = state.state

tests/components/wake_word/snapshots/test_init.ambr

@@ -1,4 +1,7 @@
 # serializer version: 1
+# name: test_detected_entity
+  None
+# ---
 # name: test_ws_detect
   dict({
     'event': dict({

tests/components/wake_word/test_init.py

@@ -3,9 +3,11 @@ from collections.abc import AsyncIterable, Generator
 from pathlib import Path
 
 import pytest
+from syrupy.assertion import SnapshotAssertion
 
 from homeassistant.components import wake_word
 from homeassistant.config_entries import ConfigEntry, ConfigEntryState, ConfigFlow
+from homeassistant.const import EntityCategory
 from homeassistant.core import HomeAssistant, State
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.setup import async_setup_component
@@ -147,7 +149,10 @@ async def test_config_entry_unload(
 
 
 async def test_detected_entity(
-    hass: HomeAssistant, tmp_path: Path, setup: MockProviderEntity
+    hass: HomeAssistant,
+    tmp_path: Path,
+    setup: MockProviderEntity,
+    snapshot: SnapshotAssertion,
 ) -> None:
     """Test successful detection through entity."""
 
@@ -158,9 +163,13 @@ async def test_detected_entity(
             timestamp += _MS_PER_CHUNK
 
     # Need 2 seconds to trigger
+    state = setup.state
     result = await setup.async_process_audio_stream(three_second_stream())
     assert result == wake_word.DetectionResult("test_ww", 2048)
 
+    assert state != setup.state
+    assert state == snapshot
+
 
 async def test_not_detected_entity(
     hass: HomeAssistant, setup: MockProviderEntity
@@ -174,9 +183,13 @@ async def test_not_detected_entity(
             timestamp += _MS_PER_CHUNK
 
     # Need 2 seconds to trigger
+    state = setup.state
     result = await setup.async_process_audio_stream(one_second_stream())
     assert result is None
 
+    # State should only change when there's a detection
+    assert state == setup.state
+
 
 async def test_default_engine_none(hass: HomeAssistant, tmp_path: Path) -> None:
     """Test async_default_engine."""
@@ -224,3 +237,10 @@ async def test_restore_state(
     state = hass.states.get(entity_id)
     assert state
     assert state.state == timestamp
+
+
+async def test_entity_attributes(
+    hass: HomeAssistant, mock_provider_entity: MockProviderEntity
+) -> None:
+    """Test that the provider entity attributes match expectations."""
+    assert mock_provider_entity.entity_category == EntityCategory.DIAGNOSTIC