@Test
  public void urlSigningServiceFailureTest() throws Exception {
    String msg = "@@expected";
    urlSigningServiceFactory.getSignedUrlException =
        new RestServiceException(msg, RestServiceErrorCode.InternalServerError);
    verifyFailureWithMsg(msg);
  }
Tests where {@link UrlSigningService} fails.
@throws Exception
ambry-frontend/src/test/java/com/github/ambry/frontend/GetSignedUrlHandlerTest.java