[ISSUE #8796] Add more test coverage for PopLongPollingService

[yx9o]

Fixes #8796 .

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.37%. Comparing base (c5ac8a4) to head (9e7bf9f).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8797      +/-   ##
=============================================
- Coverage      47.43%   47.37%   -0.06%     
+ Complexity     11577    11566      -11     
=============================================
  Files           1282     1282              
  Lines          89864    89864              
  Branches       11563    11563              
=============================================
- Hits           42623    42574      -49     
- Misses         41998    42039      +41     
- Partials        5243     5251       +8     

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