@Test
 public void checkMissingMimeType() throws Exception {
   log.info(
       "\n############################# TEST: missing mimeType in DocumentEntry  ############################");
   SubmitObjectsRequest req = XDSTestUtil.getSubmitObjectsRequest(TEST_METADATA_FILENAME);
   ExtrinsicObjectType doc =
       (ExtrinsicObjectType) req.getRegistryObjectList().getIdentifiable().get(0).getValue();
   doc.setMimeType("");
   doRegisterDocumentAndCheckError(
       req, XDSException.XDS_ERR_REGISTRY_METADATA_ERROR, "Check missing mimeType");
 }