chore: add panic test for extensions without a leading dot

[Boshen]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #150 will not alter performance

_{Comparing panic-test (b55b89c) with main (2b4c3d0)}

Summary

✅ 2 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.63%. Comparing base (2b4c3d0) to head (b55b89c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
+ Coverage   96.19%   96.63%   +0.43%     
==========================================
  Files          11       11              
  Lines        2288     2288              
==========================================
+ Hits         2201     2211      +10     
+ Misses         87       77      -10     

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