Improve testing

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.96%. Comparing base (87a5707) to head (8970816).
⚠️ Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
src/techui_builder/generate.py	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   60.53%   55.96%   -4.57%     
==========================================
  Files           7        7              
  Lines         565      570       +5     
==========================================
- Hits          342      319      -23     
- Misses        223      251      +28     

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