Faker\Provider\Image::image PHP Method

    public static function image($dir = null, $width = 640, $height = 480, $category = null, $fullPath = true, $randomize = true, $word = null)
    {
        $dir = is_null($dir) ? sys_get_temp_dir() : $dir;
        // GNU/Linux / OS X / Windows compatible
        // Validate directory path
        if (!is_dir($dir) || !is_writable($dir)) {
            throw new \InvalidArgumentException(sprintf('Cannot write to directory "%s"', $dir));
        }
        // Generate a random filename. Use the server address so that a file
        // generated at the same time on a different server won't have a collision.
        $name = md5(uniqid(empty($_SERVER['SERVER_ADDR']) ? '' : $_SERVER['SERVER_ADDR'], true));
        $filename = $name . '.jpg';
        $filepath = $dir . DIRECTORY_SEPARATOR . $filename;
        $url = static::imageUrl($width, $height, $category, $randomize, $word);
        // save file
        if (function_exists('curl_exec')) {
            // use cURL
            $fp = fopen($filepath, 'w');
            $ch = curl_init($url);
            curl_setopt($ch, CURLOPT_FILE, $fp);
            $success = curl_exec($ch) && curl_getinfo($ch, CURLINFO_HTTP_CODE) === 200;
            if ($success) {
                fclose($fp);
            } else {
                unlink($filepath);
            }
            curl_close($ch);
        } elseif (ini_get('allow_url_fopen')) {
            // use remote fopen() via copy()
            $success = copy($url, $filepath);
        } else {
            return new \RuntimeException('The image formatter downloads an image from a remote HTTP server. Therefore, it requires that PHP can request remote hosts, either via cURL or fopen()');
        }
        if (!$success) {
            // could not contact the distant URL or HTTP error - fail silently.
            return false;
        }
        return $fullPath ? $filepath : $filename;
    }

 public function testDownloadWithDefaults()
 {
     $url = "http://www.lorempixel.com/";
     $curlPing = curl_init($url);
     curl_setopt($curlPing, CURLOPT_TIMEOUT, 5);
     curl_setopt($curlPing, CURLOPT_CONNECTTIMEOUT, 5);
     curl_setopt($curlPing, CURLOPT_RETURNTRANSFER, true);
     $data = curl_exec($curlPing);
     $httpCode = curl_getinfo($curlPing, CURLINFO_HTTP_CODE);
     curl_close($curlPing);
     if ($httpCode < 200 | $httpCode > 300) {
         $this->markTestSkipped("LoremPixel is offline, skipping image download");
     }
     $file = Image::image(sys_get_temp_dir());
     $this->assertFileExists($file);
     if (function_exists('getimagesize')) {
         list($width, $height, $type, $attr) = getimagesize($file);
         $this->assertEquals(640, $width);
         $this->assertEquals(480, $height);
         $this->assertEquals(constant('IMAGETYPE_JPEG'), $type);
     } else {
         $this->assertEquals('jpg', pathinfo($file, PATHINFO_EXTENSION));
     }
     if (file_exists($file)) {
         unlink($file);
     }
 }