test: add missing utils tests

[rickstaa]

This PR adds several missing tests for the utils.js file. Let's first review and apply #1205 before merging this.

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Name	Status	Preview	Updated
github-readme-stats	✅ Ready (Inspect)	Visit Preview	Oct 15, 2022 at 10:04AM (UTC)

[codecov]

Codecov Report

Base: 96.65% // Head: 96.71% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (533fe04) compared to base (54cc291).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2199      +/-   ##
==========================================
+ Coverage   96.65%   96.71%   +0.05%     
==========================================
  Files          22       22              
  Lines        3796     3800       +4     
  Branches      323      339      +16     
==========================================
+ Hits         3669     3675       +6     
+ Misses        125      123       -2     
  Partials        2        2              

Impacted Files	Coverage Δ
src/common/utils.js	100.00% <100.00%> (+0.45%)	⬆️
src/cards/stats-card.js	100.00% <0.00%> (ø)

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