More testing

[lasuillard]

Improve test coverage & quality.

Recreated PR #138.

[codecov]

Codecov Report

Attention: Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.92%. Comparing base (e828df4) to head (74c2515).

✅ All tests successful. No failed tests found.

Files	Patch %	Lines
src/lib/search.ts	77.77%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
+ Coverage   88.55%   89.92%   +1.36%     
==========================================
  Files          43       39       -4     
  Lines        1127     1032      -95     
  Branches      101       91      -10     
==========================================
- Hits          998      928      -70     
+ Misses         31       14      -17     
+ Partials       98       90       -8     

Flag	Coverage Δ
unit	89.92% <92.00%> (+1.36%)	⬆️

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[codecov]

Bundle Report

Changes will decrease total bundle size by 3.89kB ⬇️

Bundle name	Size	Change
lasuillard.github.io-esm	376.9kB	3.89kB ⬇️