Enhancement/2025 09 test reinforcement

[takapi327]

Implementation Details

Fixes

Fixes #xxxxx

Pull Request Checklist

• Wrote unit and integration tests
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code formatting by scalafmt (sbt scalafmtAll command execution)
• Add copyright headers to new files

References

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.55%. Comparing base (d2ae0d8) to head (61993cb).
⚠️ Report is 9 commits behind head on series/0.4.x.
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Additional details and impacted files

@@               Coverage Diff                @@
##           series/0.4.x     #539      +/-   ##
================================================
+ Coverage         76.05%   83.55%   +7.50%     
================================================
  Files               185      185              
  Lines              8677     8677              
  Branches           1146     1146              
================================================
+ Hits               6599     7250     +651     
+ Misses             2078     1427     -651     

Flag	Coverage Δ
3.3.6	83.98% <100.00%> (+7.95%)	⬆️
3.7.2	84.02% <100.00%> (+7.95%)	⬆️

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