TASK: Add tests for methods in `person.py`

[TheGittyPerson]

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Difficulty: Lower Intermediate to Upper Intermediate

TODO:

• First, combine all the test files, except for test_inventory.py, into a single test_person.py file.
• Add tests for all methods in person.py that don't have one yet
• Remember to add type hints and docstrings where necessary and follow PEP 8

PR steps:

1. Fork this repo
2. Clone the forked repo
3. Create a new branch and name it test/person-all
4. Push commits to your remote fork
5. Create a pull request titled TASK: Add tests for methods in `person.py` (#151)
6. At the end of the PR description, add Closes #151
7. Submit the PR (Ensure you allow maintainers to edit)

Please make sure you have read the Contributing Guidelines before working.

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