Test that NULL Protection Profile is disabled

[Sean-Der]

Resolves pion/srtp#297

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.69%. Comparing base (271ab55) to head (974dadc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2939      +/-   ##
==========================================
- Coverage   79.01%   77.69%   -1.33%     
==========================================
  Files          89       89              
  Lines        8584    10462    +1878     
==========================================
+ Hits         6783     8128    +1345     
- Misses       1311     1845     +534     
+ Partials      490      489       -1     

Flag	Coverage Δ
go	79.25% <ø> (-1.31%)	⬇️
wasm	63.56% <ø> (-0.24%)	⬇️

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