libphonenumber\PhoneNumberUtil::resetInstance PHP Method

    public static function resetInstance()
    {
        static::$instance = null;
    }

 public function setUp()
 {
     PhoneNumberUtil::resetInstance();
     PhoneNumberOfflineGeocoder::resetInstance();
     $this->phoneUtil = PhoneNumberUtil::getInstance();
     $this->geocoder = PhoneNumberOfflineGeocoder::getInstance();
 }