Add large battery of tests, primarily workers

test/music_library/artists/batch_test.exs

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+defmodule MusicLibrary.Artists.BatchTest do
+  use MusicLibrary.DataCase
+
+  import MusicLibrary.Fixtures.Records
+
+  alias MusicLibrary.Artists.Batch
+
+  setup do
+    record = record()
+    artist = hd(record.artists)
+    _artist_info = artist_info(artist.musicbrainz_id)
+    :ok
+  end
+
+  describe "refresh_musicbrainz_data/0" do
+    test "enqueues refresh jobs for all artist infos" do
+      assert {:ok, []} = Batch.refresh_musicbrainz_data()
+    end
+  end
+
+  describe "refresh_discogs_data/0" do
+    test "enqueues refresh jobs for all artist infos" do
+      assert {:ok, []} = Batch.refresh_discogs_data()
+    end
+  end
+
+  describe "refresh_wikipedia_data/0" do
+    test "enqueues refresh jobs for all artist infos" do
+      assert {:ok, []} = Batch.refresh_wikipedia_data()
+    end
+  end
+
+  describe "refresh_lastfm_data/0" do
+    test "enqueues refresh jobs for all artist infos" do
+      assert {:ok, []} = Batch.refresh_lastfm_data()
+    end
+  end
+end