Render a minimal artist page

test/last_fm/artist_test.exs

@@ -1,4 +1,4 @@
-defmodule LastFm.TrackTest do
+defmodule LastFm.ArtistTest do
   use ExUnit.Case, async: true
 
   @api_response_path Path.expand("../support/fixtures/artist.getinfo.json", __DIR__)

test/music_library/records_test.exs

@@ -171,9 +171,9 @@ defmodule MusicLibrary.RecordsTest do
   describe "get_artist/1" do
     test "it returns records with essential data" do
       record = record_fixture()
-      expected = record.artists |> hd()
+      [expected] = record.artists
 
-      artist = Records.get_artist(expected.musicbrainz_id)
+      artist = Records.get_artist!(expected.musicbrainz_id)
 
       assert expected == artist
     end