Fix test issue

Sources/Model/Album.cs

@@ -115,7 +115,7 @@ namespace Model
         public override bool Equals(object? obj)
         {
             if (obj is null) return false;
-            if (obj.GetType() != typeof(Artist)) return false;
+            if (obj.GetType() != typeof(Album)) return false;
             if (obj is Album album && ImageURL == album.ImageURL) return true;
             else return false;
         }