test cleanup and improvements

[bhazelton]

Description

General test cleanup, making sure all the tests actually assert something useful and are atomized as much as possible. Also added some coverage for some missing lines and re-wrote some old test files that had lots of weird issues.

Motivation and Context

fixes #311 fixes #314

Types of changes

• [ ] Bug fix (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 change)
• [ ] Reference simulation update or replacement
• [ ] Documentation change (documentation changes only)
• [ ] Version change
• [ ] Build or continuous integration change
• [x] Other: test cleanup

Checklist:

For all pull requests:

• [x] I have read the contribution guide.
• [x] My code follows the code style of this project.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.68%. Comparing base (64ee930) to head (7769eee).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #449 +/- ## ========================================== + Coverage 99.55% 99.68% +0.13% ========================================== Files 12 12 Lines 2229 2235 +6 ========================================== + Hits 2219 2228 +9 + Misses 10 7 -3 ```

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