[ISSUE #9652] Enhance test for MQClientInstance

[GabrielDUX]

Which Issue(s) This PR Fixes

Fixes #9652

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.00%. Comparing base (7ab7ddd) to head (5246340).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9653      +/-   ##
=============================================
- Coverage      48.11%   48.00%   -0.11%     
+ Complexity     12069    12050      -19     
=============================================
  Files           1313     1313              
  Lines          92837    92837              
  Branches       11868    11868              
=============================================
- Hits           44670    44570     -100     
- Misses         42667    42744      +77     
- Partials        5500     5523      +23     

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