koordlet: fix some unstable ut

[zwzhang0107]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (3c4ddc0) 64.79% compared to head (bd6fdc7) 64.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1282      +/-   ##
==========================================
- Coverage   64.79%   64.78%   -0.02%     
==========================================
  Files         313      313              
  Lines       32938    32938              
==========================================
- Hits        21343    21338       -5     
- Misses      10035    10041       +6     
+ Partials     1560     1559       -1     

Flag	Coverage Δ
unittests	64.78% <ø> (-0.02%)	⬇️

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see 3 files with indirect coverage changes

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[saintube]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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