SingleIdentityLink() throws Exception {          ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskProcess");         runtimeService.addUserIdentityLink(processInstance.getId(), "kermit", "myType");          closeResponse(executeRequest(new HttpDelete(SERVER_URL_PREFIX + RestUrls.createRelativeResourceUrl(RestUrls.URL_PROCESS_INSTANCE_IDENTITYLINK, processInstance.getId(), "kermit", "myType")),                 HttpStatus.SC_NO