[ISSUE #8586] Add more test coverage for SelectMessageQueueByRandom

[yx9o]

Fixes #8586 .

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.18%. Comparing base (a1ea1eb) to head (5ad322a).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8587      +/-   ##
=============================================
- Coverage      47.27%   47.18%   -0.10%     
+ Complexity     11467    11449      -18     
=============================================
  Files           1277     1277              
  Lines          89342    89342              
  Branches       11480    11480              
=============================================
- Hits           42234    42152      -82     
- Misses         41918    41986      +68     
- Partials        5190     5204      +14     

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