Improve test package

[theEvilReaper]

Proposed changes

The test package has grown over time, as mentioned in issue #108. This pull request overhauls the structure of each test class. The changes include better display names, deletion of duplicated tests, and some refactoring to use other functionalities from JUnit 5. Closes #108

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

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• I have read the CONTRIBUTING.md
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)