Add sonos snapshot test (#124036)

tests/components/sonos/snapshots/test_media_player.ambr

@@ -0,0 +1,58 @@
+# serializer version: 1
+# name: test_entity_basic[media_player.zone_a-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': dict({
+    }),
+    'config_entry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'media_player',
+    'entity_category': None,
+    'entity_id': 'media_player.zone_a',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'options': dict({
+    }),
+    'original_device_class': <MediaPlayerDeviceClass.SPEAKER: 'speaker'>,
+    'original_icon': None,
+    'original_name': None,
+    'platform': 'sonos',
+    'previous_unique_id': None,
+    'supported_features': <MediaPlayerEntityFeature: 4127295>,
+    'translation_key': None,
+    'unique_id': 'RINCON_test',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_entity_basic[media_player.zone_a-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'speaker',
+      'friendly_name': 'Zone A',
+      'group_members': list([
+        'media_player.zone_a',
+      ]),
+      'is_volume_muted': False,
+      'media_content_type': <MediaType.MUSIC: 'music'>,
+      'repeat': <RepeatMode.OFF: 'off'>,
+      'shuffle': False,
+      'supported_features': <MediaPlayerEntityFeature: 4127295>,
+      'volume_level': 0.19,
+    }),
+    'context': <ANY>,
+    'entity_id': 'media_player.zone_a',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'idle',
+  })
+# ---

tests/components/sonos/test_media_player.py

@@ -5,6 +5,7 @@ from typing import Any
 from unittest.mock import patch
 
 import pytest
+from syrupy import SnapshotAssertion
 
 from homeassistant.components.media_player import (
     ATTR_INPUT_SOURCE,
@@ -44,10 +45,10 @@ from homeassistant.const import (
     SERVICE_VOLUME_DOWN,
     SERVICE_VOLUME_SET,
     SERVICE_VOLUME_UP,
-    STATE_IDLE,
 )
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ServiceValidationError
+from homeassistant.helpers import entity_registry as er
 from homeassistant.helpers.device_registry import (
     CONNECTION_NETWORK_MAC,
     CONNECTION_UPNP,
@@ -93,15 +94,18 @@ async def test_device_registry_not_portable(
 
 
 async def test_entity_basic(
-    hass: HomeAssistant, async_autosetup_sonos, discover
+    hass: HomeAssistant,
+    async_autosetup_sonos,
+    discover,
+    entity_registry: er.EntityRegistry,
+    snapshot: SnapshotAssertion,
 ) -> None:
     """Test basic state and attributes."""
-    state = hass.states.get("media_player.zone_a")
-    assert state.state == STATE_IDLE
-    attributes = state.attributes
-    assert attributes["friendly_name"] == "Zone A"
-    assert attributes["is_volume_muted"] is False
-    assert attributes["volume_level"] == 0.19
+    entity_id = "media_player.zone_a"
+    entity_entry = entity_registry.async_get(entity_id)
+    assert entity_entry == snapshot(name=f"{entity_entry.entity_id}-entry")
+    state = hass.states.get(entity_entry.entity_id)
+    assert state == snapshot(name=f"{entity_entry.entity_id}-state")
 
 
 @pytest.mark.parametrize(