@Test
public void evalCalcCaptcha() throws Exception {

    CaptchaUtil util = new CaptchaUtil();
    List<String> excepted = Files.readAllLines(Paths.get(
            getClass().getResource("/captcha/excepted_values.txt").toURI()));
    //PROBLEM:CAPTCHA NO.13 CAN'T WORK!
    for (int i = 0; i < 50;i++) {
        int value = util.evalCalcCaptcha(ImageIO.read(
                getClass().getResource("/captcha/captcha" + i + ".png")));
        System.out.println(value);
        assertEquals(Integer.parseInt(excepted.get(i).trim()), value);
    }
}