public function prepareTestArticle($published = false, $visible = false)
 {
     $article = new Article();
     $article->title = 'Test title';
     $article->slug = \Illuminate\Support\Str::slug($article->title);
     $article->digest = 'digest test...';
     $article->body = 'body test...';
     $article->metadescription = '...';
     if ($published) {
         if ($visible) {
             $article->publish(\Carbon\Carbon::now());
         } else {
             $article->publish(\Carbon\Carbon::now()->addDays(1));
         }
     } else {
         $article->unpublish();
     }
     return $article;
 }