updating math tests to have code coverage

[jaredwray]

Please check if the PR fulfills these requirements

• [x] Followed the Contributing guidelines.
• [x] Tests for the changes have been added (for bug fixes/features) without decreasing code coverage.
• [x] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) updating math tests to have code coverage

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +1.15% :tada:

Comparison is base (af5db9e) 98.84% compared to head (2e28b44) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #23 +/- ## =========================================== + Coverage 98.84% 100.00% +1.15% =========================================== Files 26 26 Lines 4434 4431 -3 =========================================== + Hits 4383 4431 +48 + Misses 51 0 -51 ``` | [Files Changed](https://app.codecov.io/gh/jaredwray/fumanchu/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jared+Wray) | Coverage Δ | | |---|---|---| | [lib/math.js](https://app.codecov.io/gh/jaredwray/fumanchu/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jared+Wray#diff-bGliL21hdGguanM=) | `100.00% <ø> (+17.70%)` | :arrow_up: |

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