String id = in.getId().toString();
logger.debug("GridFS in: {}", in);
logger.debug("Document created with id: {}", id);
GridFSDBFile out = gridFS.findOne(in.getFilename());
logger.debug("GridFS from findOne: {}", out);
out = gridFS.findOne(new ObjectId(id));
logger.debug("GridFS from findOne: {}", out);
Assert.assertEquals(out.getId(), in.getId());