Fix issue with tests in utils/add additional tests

[vivek-p-a]

Description

In 'client/app/utils' the tests were not being run by jest due to naming convention. For fixing this i have changed the filename of the test file.

After changing the file name, have fixed the issues with the existing test file and have also added additional tests to cover all the methods defined in 'client/app/utils/index.js'

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[julianguyen]

Thanks for fixing this!! And adding more coverage 🎉

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