Write more tests?

Do we need some more tests? Maybe a storage functionality BucketLister test and more tests core minio.

```
$   make test
ok  	github.com/teamhephy/minio/src/healthsrv	0.004s
?   	github.com/teamhephy/minio/src/storage	[no test files]
ok  	github.com/teamhephy/minio	0.004s
```