anchor.diff:         var mongoConfig = yaml.loadYaml(config);
          _mongoDb = new Db("mongodb://${mongoConfig["host"]}/${mongoConfig["database"]}");
          return _mongoDb.open().then((_) {
  -         _worldCollection = _mongoDb.collection("World");
  -         _fortuneCollection = _mongoDb.collection("Fortune");
  +         _worldCollection = _mongoDb.collection("world");
  +         _fortuneCollection = _mongoDb.collection("fortune");
          });
        })
      ]).then((_) {
  
positive.code:             return _connectionPool.connect()
                .then((connection) {
                  return connection.execute(
                        'UPDATE "World" SET "randomnumber" = @randomnumber WHERE "id" = @id;',
                        { 
                          'randomnumber': world.randomnumber,
                          'id': world.id 
  
negative.code: _query() {
    return _connectionPool.connect().then((connection) {
      return connection
        .query('SELECT "id", "randomnumber" FROM "world" WHERE id = @id;', { 'id': _RANDOM.nextInt(_WORLD_TABLE_SIZE) + 1 })
        .single
        .then((row) =>new World(row[0], row[1]))
        .whenComplete(() {
  