Test IR change with main chain role change

[roman-khimov]

Is your feature request related to a problem? Please describe.

I'm always frustrated when we don't have tests for some core NeoFS things.

Describe the solution you'd like

Test IR change in 4-node IR scenario with main chain. IR is controlled by the designation contract on main chain, it's the same as IR set initially, but main chain committee can set it to any other list of nodes and FS chain must follow this change. IR includes CNs, both change in this setting.

Additional context

neo-project/neo#2267

[evgeniiz321]

@roman-khimov questions:

1. how to get the hash of the designation contract?
2. as far as I understand I need to invoke designateAsRole function, but with what arguments? (designateAsRole int:16 [ {keys_str} ] -- {script_hash} ? )
3. from IR side - how can I check that fs chain reflected the state of the designation contract (and how soon this can happen? next epoch?)

[roman-khimov]

1. 0x49cf4e5378ffcd4dec034fd98a174c5491e395e2
2. Yes, it's an ID of role and an array of keys. Signed by the committee (in your case it should 1/1 for the main chain since you only have one validator).
3. Get the committee from FS chain, check for logs. Not sure IR exports any metrics for it. neo-exported technically can do it, but we don't use it currently. IIRC it can take an epoch, but let's check.