Add unit test on MatrixRoom extension

[bmarty]

Complement to #3324

[github-actions]

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[jmartinesp]

Nice, thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.76%. Comparing base (a942fd4) to head (bb08525).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3327      +/-   ##
===========================================
+ Coverage    82.74%   82.76%   +0.01%     
===========================================
  Files         1680     1680              
  Lines        39380    39374       -6     
  Branches      4778     4776       -2     
===========================================
+ Hits         32585    32586       +1     
+ Misses        5117     5115       -2     
+ Partials      1678     1673       -5     

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