@Test
  public void testSecretCorrectlySigns() {

    LocalDateTime dateTime =
        LocalDateTime.from(DateTimeFormatter.ISO_DATE_TIME.parse("2014-06-03T17:48:47.774453"));

    CoinkiteSigningRequestInterceptor coinkiteSigningRequestInterceptor =
        new CoinkiteSigningRequestInterceptor();
    coinkiteSigningRequestInterceptor.setDateTime(dateTime);

    RequestTemplate template = new RequestTemplate().method("GET").append("/example/endpoint");

    coinkiteSigningRequestInterceptor.apply(template);

    Collection<String> collection = template.headers().get(Constants.X_CK_TIMESTAMP);
    assertEquals(collection.iterator().next(), "2014-06-03T17:48:47.774453");
    collection = template.headers().get(Constants.X_CK_SIGN);
    assertEquals(
        "042341c271b14aaad1c898d35c9ca0bc8552e1cb4d6683f28edd57e3e86ed76c",
        collection.iterator().next());
  }