}
        };
    assertThat(
            hmacMd5(customKey)
                .hashString("The quick brown fox jumps over the lazy dog", UTF_8)
                .toString())
        .isEqualTo("ad262969c53bc16032f160081c4a07a0");
  }

  public void testBadKey_emptyKey() throws Exception {
    SecretKey badKey =
        new SecretKey() {
          @Override
          public String getAlgorithm() {