More Unittest for CLI

[mhmohona]

Contributor checklist

• [x] 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

[github-actions[bot]]

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Maintainer checklist

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• [x] The linting and formatting workflow within the PR checks do not indicate new errors in the files changed

• [x] The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)