public static String getSHA1Checksum(File file) throws IOException, NoSuchAlgorithmException {
        return getChecksum(SHA1, file);
    }
@Test
    public void testGetSHA1Checksum_String() {
        String text = "test string";
        String expResult = "661295c9cbf9d6b2f6428414504a8deed3020641";
        String result = Checksum.getSHA1Checksum(text);
        assertEquals(expResult, result);
    }