libphonenumber\ShortNumberInfo::resetInstance PHP Method

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

 public function setUp()
 {
     self::$plusSymbol = pack('H*', 'efbc8b');
     PhoneNumberUtil::resetInstance();
     ShortNumberInfo::resetInstance();
     $this->phoneUtil = PhoneNumberUtil::getInstance(PhoneNumberUtilTest::TEST_META_DATA_FILE_PREFIX, CountryCodeToRegionCodeMapForTesting::$countryCodeToRegionCodeMapForTesting);
     $this->shortInfo = ShortNumberInfo::getInstance();
 }