@Test
 public void removeDeleteAt() throws IOException, DateParseException {
   expectStatusCode(202, false);
   prepareMetadata();
   object.setDeleteAt(null);
   verifyHeaderValue(null, X_DELETE_AT, "POST");
 }
 @Test
 public void setDeleteAt() throws IOException, DateParseException {
   expectStatusCode(202, false);
   prepareMetadata();
   final Date date = DateUtils.parseDate("Mon, 03 Sep 2001 05:40:33 GMT");
   object.setDeleteAt(date);
   verifyHeaderValue(Long.toString(date.getTime() / 1000), X_DELETE_AT, "POST");
 }