How to simulate Node firmware updates?

Apart from using the following options of the "isi upgrade cluster firmware start " command:

--no-burn               -- Do not burn the firmware.

--exclude-device        -- List of comma-separated devices to exclude from the firmware upgrade. Each device name must be enclosed in double quotes,    while the entire list must be enclosed in single quotes.

, Is there any way to simulate/test a node firmware upgrade?

I assume the simulator cannot be used and that a real physical cluster has to be used? If thats the case, I assume we cannot roll back a node firmare update?

Im looking to automate node firmware upgrades but first I need a mechanism to test it repeatably.