Streamline CI tests

[chrispyles]

Streamline tests, reduce # files necessary, etc. so that CI doesn't take so long to run and to reduce the size of the repo.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[chrispyles]

This would also be a good opportunity to convert the testing framework from unittest to pytest.

[chrispyles]

#467 converts the test framework to pytest for the beta version of v4 but results in a decrease in test coverage by ~13%. More tests need to be added.