private void append(ProducerStateManager stateManager,
                        long producerId,
                        int offset,
                        RecordBatch batch) {
        ProducerAppendInfo appendInfo = stateManager.prepareUpdate(producerId, AppendOrigin.CLIENT);
        appendInfo.append(batch, Optional.empty());
        stateManager.update(appendInfo);
        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