test: increase code coverage

[MichaelSolati]

No description provided.

[codecov]

Codecov Report

Merging #25 (4b3ca15) into main (dfe80f3) will increase coverage by 35.77%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #25       +/-   ##
===========================================
+ Coverage   35.47%   71.24%   +35.77%     
===========================================
  Files          21       21               
  Lines        3986     3986               
  Branches      183      419      +236     
===========================================
+ Hits         1414     2840     +1426     
+ Misses       2572     1146     -1426     

Impacted Files	Coverage Δ
tools/lib/cache-helper.js	100.00% <100.00%> (+100.00%)	⬆️
tools/lib/chrome-source.js	98.59% <100.00%> (+98.59%)	⬆️
tools/lib/chrome-versions.js	96.89% <100.00%> (+96.89%)	⬆️
tools/lib/comment.js	74.49% <100.00%> (+28.98%)	⬆️
tools/override.js	87.48% <100.00%> (+64.27%)	⬆️
tools/prepare.js	89.20% <100.00%> (+89.20%)	⬆️
tools/lib/semaphore.js	100.00% <0.00%> (+6.45%)	⬆️
tools/lib/equal.js	100.00% <0.00%> (+21.87%)	⬆️
tools/lib/channel.js	100.00% <0.00%> (+29.41%)	⬆️
... and 8 more

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