Add albumartist to musicbrainz test

tests/backends/local/translator_test.py

@@ -142,10 +142,14 @@ class MPDTagCacheToTracksTest(unittest.TestCase):
             data_folder(''))
         artist = list(expected_tracks[0].artists)[0].copy(
             musicbrainz_id='7364dea6-ca9a-48e3-be01-b44ad0d19897')
-        album = expected_tracks[0].album.copy(artists=[artist],
+        albumartist = list(expected_tracks[0].artists)[0].copy(
+            name='albumartistname',
+            musicbrainz_id='7364dea6-ca9a-48e3-be01-b44ad0d19897')
+        album = expected_tracks[0].album.copy(artists=[albumartist],
             musicbrainz_id='cb5f1603-d314-4c9c-91e5-e295cfb125d2')
         track = expected_tracks[0].copy(artists=[artist], album=album,
             musicbrainz_id='90488461-8c1f-4a4e-826b-4c6dc70801f0')
+
         self.assertEqual(track, list(tracks)[0])
 
     def test_albumartist_tag_cache(self):

tests/data/musicbrainz_tag_cache

@@ -9,6 +9,7 @@ Time: 4
 Artist: name
 Title: trackname
 Album: albumname
+AlbumArtist: albumartistname
 Track: 1/2
 Date: 2006
 MUSICBRAINZ_ALBUMID: cb5f1603-d314-4c9c-91e5-e295cfb125d2