test: Increase code coverage in package utils

[emilyhuxng]

Closes #1089

Increase code coverage in package utils.

[codecov]

Codecov Report

Merging #1093 (f9cb4e6) into main (144605a) will increase coverage by 0.43%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1093      +/-   ##
==========================================
+ Coverage   42.91%   43.35%   +0.43%     
==========================================
  Files         434      434              
  Lines       32596    32611      +15     
  Branches     8202     8212      +10     
==========================================
+ Hits        13989    14138     +149     
+ Misses      18558    18424     -134     
  Partials       49       49              

Flag	Coverage Δ
unit	43.35% <100.00%> (+0.43%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/utils/src/TestUtils.ts	91.30% <100.00%> (+91.30%)	⬆️
...sidebar/conditional-formatting/ConditionEditor.tsx	8.00% <0.00%> (-0.28%)	⬇️
...ebar/conditional-formatting/ColumnFormatEditor.tsx	3.70% <0.00%> (-0.22%)	⬇️
...nditional-formatting/ConditionalFormattingUtils.ts	27.58% <0.00%> (+1.27%)	⬆️
packages/utils/src/PromiseUtils.ts	95.65% <0.00%> (+17.39%)	⬆️
packages/utils/src/RangeUtils.ts	100.00% <0.00%> (+90.00%)	⬆️
packages/utils/src/Asserts.ts	100.00% <0.00%> (+100.00%)	⬆️
packages/utils/src/ColorUtils.ts	100.00% <0.00%> (+100.00%)	⬆️
packages/utils/src/TimeoutError.ts	100.00% <0.00%> (+100.00%)	⬆️
... and 4 more

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