Add test for ssrc-group after ssrc

[Sean-Der]

Resolves #2459

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.49%. Comparing base (d661d12) to head (520dffd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2730      +/-   ##
==========================================
+ Coverage   76.45%   76.49%   +0.04%     
==========================================
  Files          87       87              
  Lines        9970     9970              
==========================================
+ Hits         7623     7627       +4     
+ Misses       1876     1872       -4     
  Partials      471      471              

Flag	Coverage Δ
go	78.03% <ø> (+0.04%)	⬆️
wasm	63.84% <ø> (ø)

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