test: add unit tests for processing, serialization, and main utils

[ogabrielluiz]

Summary

• Add unit tests for expand flow processing, extended serialization, and main CLI utilities
• 4 new test files covering previously untested modules

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/processing-serialization-utils

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.31%. Comparing base (8d01ba4) to head (5c5699f).
⚠️ Report is 4 commits behind head on release-1.9.0.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.9.0   #12515      +/-   ##
=================================================
+ Coverage          50.05%   50.31%   +0.25%     
=================================================
  Files               1930     1932       +2     
  Lines             172591   172730     +139     
  Branches           25234    25404     +170     
=================================================
+ Hits               86398    86901     +503     
+ Misses             85147    84784     -363     
+ Partials            1046     1045       -1     

Flag	Coverage Δ
backend	55.96% <ø> (+0.14%)	⬆️
frontend	49.30% <ø> (+0.33%)	⬆️
lfx	49.07% <ø> (+<0.01%)	⬆️

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see 194 files with indirect coverage changes

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[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	29.69% (31319/105481)	63.69% (3976/6242)	31.04% (731/2355)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
3104	0 💤	0 ❌	0 🔥	4m 57s ⏱️