test: add test for label filter case

[SYaoJun]

Reason for this PR

improve the coverage and add label filter test

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.92%. Comparing base (b21da29) to head (5be081c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #916      +/-   ##
============================================
+ Coverage     80.60%   80.92%   +0.31%     
  Complexity      615      615              
============================================
  Files            94       94              
  Lines         10709    10709              
  Branches       1055     1055              
============================================
+ Hits           8632     8666      +34     
+ Misses         1837     1803      -34     
  Partials        240      240              

Flag	Coverage Δ
cpp	71.55% <ø> (+0.64%)	⬆️

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