Improve Testing Coverage for Numba Caching

[aaronzedwick]

Closes #964

Overview

There are several places in our code that lack functions to test them, as seen inside the code coverage. This PR addresses those files by adding test cases.

PR Checklist

General

• An issue is linked created and linked
• Add appropriate labels
• Filled out Overview and Expected Usage (if applicable) sections

Testing

• Adequate tests are created if there is new functionality
• Tests cover all possible logical paths in your function
• Tests are not too basic (such as simply calling a function and nothing else)