Minio is a distributed object storage server built for cloud applications and devops. To use minio in distributed mode and have redundancy there are some pre-requisites. To understand them you should read the distributed minio quickstart guide. Before you set a minio cluster, make sure you set minio global variables using the template under vars/. Once initialized a web GUI will be available at http://${CLUSTER_NAME}0.${HOST_DOMAIN}:9091, or any other host part of the minio group.
For unit tests please read the README under roles/minio/tests/.