Corcel\Post::newFromBuilder PHP Method

    public function newFromBuilder($attributes = [], $connection = null)
    {
        if (is_object($attributes) && array_key_exists($attributes->post_type, static::$postTypes)) {
            $class = static::$postTypes[$attributes->post_type];
        } elseif (is_array($attributes) && array_key_exists($attributes['post_type'], static::$postTypes)) {
            $class = static::$postTypes[$attributes['post_type']];
        } else {
            $class = get_called_class();
        }
        $model = new $class([]);
        $model->exists = true;
        $model->setRawAttributes((array) $attributes, true);
        $model->setConnection($connection ?: $this->connection);
        return $model;
    }

 public function testPostTypeConstructor()
 {
     Post::registerPostType('video', 'Video');
     $post = new Post();
     $model = $post->newFromBuilder(['post_type' => 'video']);
     $this->assertInstanceOf("Video", $model);
 }