mongoURI := "mongodb://localhost:27017/test"
client, err := mongo.NewClient(options.Client().ApplyURI(mongoURI))

2019/04/02 15:39:52 auth error: sasl conversation error: unable to authenticate using mechanism "SCRAM-SHA-1": (AuthenticationFailed) Authentication failed.
exit status 1

2019-04-02T15:39:52.728+1100 I NETWORK  [conn105] received client metadata from 127.0.0.1:54219 conn105: { driver: { name: "mongo-go-driver", version: "v1.0.0" }, os: { type: "darwin", architecture: "amd64" }, platform: "go1.11.5" }
2019-04-02T15:39:52.728+1100 I ACCESS   [conn105] Supported SASL mechanisms requested for unknown user '@test'
2019-04-02T15:39:52.728+1100 I ACCESS   [conn105] SASL SCRAM-SHA-1 authentication failed for  on test from client 127.0.0.1:54219 ; BadValue: Invalid SCRAM user name: n=

mongoURI := "mongodb://localhost:27017"
mongoURI := "mongodb://localhost:27017/admin"
mongoURI := "mongodb://localhost:27017/?authSource=admin"