JBZoo\Image\Image::isPng PHP Method

    public function isPng()
    {
        return Helper::isPng($this->_mime);
    }

 public function testGetInfoPng()
 {
     $original = Helper::getOrig('butterfly.png');
     $img = new Image($original);
     $info = $img->getInfo();
     is(640, $info['width']);
     is(478, $info['height']);
     is('image/png', $info['mime']);
     is('landscape', $info['orient']);
     isEmpty($info['exif']);
     isTrue($img->isPng());
 }