Test restore rman backup

Dear guru,

1. Masterserver (Linux) - NBU 7.6

2. Mediaserver (Linux) - NBU 7.6

3. Client (Solaris) - NBU 6.5

Scenario:

1. test OS backup - OK. Backup and restore verified working

2. test RMAN backup - OK. Backup working,

My question is how can we perform a test restore for backup with rman?

Thanks in advance.