test(idl-convert): add test for idl-convert.js

[MichaelSolati]

No description provided.

[codecov]

Codecov Report

Merging #26 (e5f893f) into main (dfe80f3) will increase coverage by 15.73%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #26       +/-   ##
===========================================
+ Coverage   35.47%   51.20%   +15.73%     
===========================================
  Files          21       21               
  Lines        3986     3986               
  Branches      183      252       +69     
===========================================
+ Hits         1414     2041      +627     
+ Misses       2572     1945      -627     

Impacted Files	Coverage Δ
tools/prepare.js	89.20% <100.00%> (+89.20%)	⬆️
tools/lib/semaphore.js	100.00% <0.00%> (+6.45%)	⬆️
tools/lib/idl-convert.js	78.26% <0.00%> (+78.26%)	⬆️
tools/lib/chrome-versions.js	85.09% <0.00%> (+85.09%)	⬆️
tools/lib/cache-helper.js	87.69% <0.00%> (+87.69%)	⬆️
tools/lib/chrome-source.js	94.36% <0.00%> (+94.36%)	⬆️

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