static void addRepairRequestForTtlUpdate(RepairRequestsDb db, DataNodeId sourceNode, BlobId blobId,
      long operationTime, long expiration) throws Exception {
    RepairRequestRecord record =
        new RepairRequestRecord(blobId.toString(), (int) blobId.getPartition().getId(), sourceNode.getHostname(),
            sourceNode.getPort(), RepairRequestRecord.OperationType.TtlUpdateRequest, operationTime, (short) -1,
            expiration);
    db.putRepairRequests(record);
  }
Test the background RepairRequestsSender and the repair requests handlers.
ambry-test-utils/src/main/java/com/github/ambry/server/ServerTestUtil.java