Fix flakey tessie media_player test (#115391)

tests/components/tessie/snapshots/test_media_player.ambr

@@ -54,6 +54,13 @@
     'attributes': ReadOnlyDict({
       'device_class': 'speaker',
       'friendly_name': 'Test Media player',
+      'media_album_name': 'Album',
+      'media_artist': 'Artist',
+      'media_duration': 60.0,
+      'media_playlist': 'Playlist',
+      'media_position': 30.0,
+      'media_title': 'Song',
+      'source': 'Spotify',
       'supported_features': <MediaPlayerEntityFeature: 0>,
       'volume_level': 0.22580323309042688,
     }),
@@ -62,6 +69,6 @@
     'last_changed': <ANY>,
     'last_reported': <ANY>,
     'last_updated': <ANY>,
-    'state': 'idle',
+    'state': 'playing',
   })
 # ---

tests/components/tessie/test_media_player.py

@@ -22,6 +22,8 @@ async def test_media_player(
     freezer: FrozenDateTimeFactory,
     snapshot: SnapshotAssertion,
     entity_registry: er.EntityRegistry,
+    mock_get_state,
+    mock_get_status,
 ) -> None:
     """Tests that the media player entity is correct when idle."""
 
@@ -38,6 +40,7 @@ async def test_media_player(
         # The refresh fixture has music playing
         freezer.tick(WAIT)
         async_fire_time_changed(hass)
+        await hass.async_block_till_done(wait_background_tasks=True)
 
         assert hass.states.get(entity_entry.entity_id) == snapshot(
             name=f"{entity_entry.entity_id}-playing"