Description

Added an additional unit test to test_cluster.py. I also cleaned up and reformatted that file.

Type of change

• Improve unit testing

Testing

N/A. This adds a unit test.

Checklist

• My code follows the style guidelines of this project. I have applied a Linter (recommended: Pycharm's code formatter) to make my whitespace consistent with the rest of the project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings
• The Harmony API is not broken by my change to the Harmony Python library
• I add third party dependencies only when necessary. If I changed the requirements, it changes in requirements.txt, pyproject.toml and also in the requirements.txt in the API repo
• If I introduced a new feature, I documented it (e.g. making a script example in the script examples repository so that people will know how to use it.

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