JBZoo\Image\Image::loadResource PHP Method

    public function loadResource($imageRes)
    {
        if (!Helper::isGdRes($imageRes)) {
            throw new Exception('Image is not GD resource!');
        }
        $this->cleanup();
        $this->_loadMeta($imageRes);
        return $this;
    }

 /**
  * @expectedException \JBZoo\Image\Exception
  */
 public function testLoadResourceUndefined()
 {
     $img = new Image();
     $img->loadResource('');
 }