added unit tests for util functions

[benhalverson]

Description

Added some more unit test for our util functions.

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Check List

• [ ] I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [ ] I have run npm run lint:js -- --fix and/or npm run lint:md -- --fix for my JavaScript and/or Markdown changes.
  • This is important as most of the cases your code changes might not be correctly linted
• [ ] I have run npm run test to check if all tests are passing, and/or npm run test -- -u to update snapshots if I created and/or updated React Components.
• [ ] I have checked that the build works locally and that npm run build work fine.
• [ ] I've covered new added functionality with unit tests if necessary.