chore: add tests for Scalar, Vector and Direction

[codecov[bot]]

Codecov Report

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

Project coverage is 80.31%. Comparing base (4e0768b) to head (e0e5141). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #208 +/- ## ========================================== + Coverage 79.60% 80.31% +0.70% ========================================== Files 96 97 +1 Lines 7542 7537 -5 ========================================== + Hits 6004 6053 +49 + Misses 1538 1484 -54 ```

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