private void appendEntry(ProducerStateManager stateManager,
                             long producerId,
                             short producerEpoch,
                             int seq,
                             long offset,
                             long milliseconds,
                             AppendOrigin appendOrigin,
                             boolean isTransactional) {
        ProducerAppendInfo producerAppendInfo = stateManager.prepareUpdate(producerId, appendOrigin);
        producerAppendInfo.appendDataBatch(producerEpoch, seq, seq, milliseconds,
                new LogOffsetMetadata(offset), offset, isTransactional);
        stateManager.update(producerAppendInfo);
        stateManager.updateMapEndOffset(offset + 1);
    }
Test that marking a snapshot for deletion when the file has already been deleted
returns None instead of the SnapshotFile. The snapshot file should be removed from
the in-memory state of the ProducerStateManager. This scenario can occur during log
recovery when the intermediate ProducerStateManager instance deletes a file without
updating the state of the "real" ProducerStateManager instance which is passed to the Log.
storage/src/test/java/org/apache/kafka/storage/internals/log/ProducerStateManagerTest.java