public function testScopeWithLang()
{
$article = $this->createArticle();
$article = RealArticle::withLang('fr')->where('id', $article->id)->first();
$this->assertEquals($article->fr->title, "Start title");
// empty
$article = RealArticle::withLang()->where('id', $article->id)->first();
$this->assertEquals($article->fr->title, "Start title");
}