DBObject dbObject = new BasicDBObject();
dbObject.put("mapWithDBRef", mapDbObject);
DBObject mapped = mapper.getMappedObject(dbObject, context.getPersistentEntity(WithMapDBRef.class));
assertThat(mapped.containsField("mapWithDBRef"), is(true));
assertThat(mapped.get("mapWithDBRef"), instanceOf(BasicDBObject.class));
assertThat(((BasicDBObject) mapped.get("mapWithDBRef")).containsField("test"), is(true));
assertThat(((BasicDBObject) mapped.get("mapWithDBRef")).get("test"), instanceOf(com.mongodb.DBRef.class));
}