public static String getMD5Checksum(File file) throws IOException, NoSuchAlgorithmException {
        return getChecksum(MD5, file);
    }
@Test
    public void testGetMD5Checksum_String() {
        String text = "test string";
        String expResult = "6f8db599de986fab7a21625b7916589c";
        String result = Checksum.getMD5Checksum(text);
        assertEquals(expResult, result);
    }