Laravel 5.6 ytake / laravel-couchbase认证问题

Question

I am using laravel 5.6 and using couchbase SDK to establish the database connection. When I run the test on core PHP I am able to access the bucket but using ytake/laravel-couchbase package it's throwing an error of authentication. My code looks like below:

public function index()
{
    $authenticator = new \Couchbase\PasswordAuthenticator();
    $authenticator->username('test')->password('test123');
    print_r($authenticator);
    \DB::connection('couchbase')->table('`test-lab`')->get();
}

I am not able to figure out how to authenticate using mentioned package or if it automatically does that so what's wrong here.