JBZoo\Image\Image::save PHP Method

    public function save($quality = null)
    {
        $quality = $quality ?: $this->_quality;
        $this->_save($this->_filename, $quality);
        return $this;
    }

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