Hasher::write(): add basic test

        assert!(calced == hashtest.expected_output);

    }

    pub fn hash_writer(t: super::HashType, data: &[u8]) -> Vec<u8> {

        let mut h = super::Hasher::new(t);

        h.write(data);

        h.finalize()

    }

    // Test vectors from http://www.nsrl.nist.gov/testdata/

    #[test]

    fn test_md5() {

            hash_test(super::RIPEMD160, test);

        }

    }

    #[test]

    fn test_writer() {

        let tv = "rust-openssl".as_bytes();

        let ht = super::RIPEMD160;

        assert!(hash_writer(ht, tv) == super::hash(ht, tv));

    }

}