assertEquals(knownOutput, Hashing.hmacMd5(MD5_KEY).hashString(input, UTF_8).toString());
    assertEquals(knownOutput, Hashing.hmacMd5(MD5_KEY).hashBytes(input.getBytes(UTF_8)).toString());
  }

  public void testKnownInputs_mixedAlgorithms() throws Exception {
    String knownOutput = "9753980fe94daa8ecaa82216519393a9";
    String input = "The quick brown fox jumps over the lazy dog";

    Mac mac = Mac.getInstance("HmacMD5");