rpc specs and some more tests

[pnowosie]

Fixes #1802

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.03%. Comparing base (a9f794f) to head (bdb993d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1834      +/-   ##
==========================================
+ Coverage   74.98%   77.03%   +2.05%     
==========================================
  Files          96       96              
  Lines        8186     8186              
==========================================
+ Hits         6138     6306     +168     
+ Misses       1520     1361     -159     
+ Partials      528      519       -9     

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[pnowosie]

⚠️ DO NOT MERGE

It will be easier to apply newly added tests on main in a new PR after one big #1880 is merged