Increase the test coverage on the client to avoid failing checks in the CI

[borodovisin]

Description

The PR contains a new set of unit tests to increase the client(Karma) code coverage.

Why are we making these changes?

To avoid the failing CI check related to the client unit tests. Now is set to a minimum of 50% on the Codecov config. Previously we had a code coverage under the desire 50% of coverage and CI check fails for all the PRs.

Note

The name of the test cases probably aren't accurate, any feedback on that is welcome.

[codecov]

Codecov Report

Merging #117 (6a96c30) into main (32f85dd) will increase coverage by 3.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   60.97%   64.74%   +3.76%     
==========================================
  Files          20       20              
  Lines         451      451              
  Branches       35       35              
==========================================
+ Hits          275      292      +17     
+ Misses        176      159      -17     

Flag	Coverage Δ
client	54.17% <ø> (+4.89%)	⬆️
server	100.00% <ø> (ø)

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Impacted Files	Coverage Δ
src/global.js	100.00% <0.00%> (+56.66%)	⬆️

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[gregjopa]

Great work @borodovisin! 💯