public static MongoDbFactory prepareMongoFactory(String... additionalCollectionToDrop) throws Exception{
MongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(new MongoClient(), "test");
MongoTemplate template = new MongoTemplate(mongoDbFactory);
template.dropCollection("messages");
template.dropCollection("data");
for (String additionalCollection : additionalCollectionToDrop) {
template.dropCollection(additionalCollection);
}
return mongoDbFactory;
}