More Unittest for CLI

[mhmohona]

Contributor checklist

• This pull request is on a separate branch and not the main branch

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Description

Added some more test cases.

Changed cli_util.py a bit to integrate tests for it.

Related issue

• #ISSUE_NUMBER

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[andrewtavis]

My changes were just formatting here as we had single quote strings in many places and imports weren't sorted. Thanks for this, @mhmohona! Great to have such an expansive testing suite 😊