test: improve test coverage

[codecov[bot]]

Codecov Report

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

Project coverage is 96.29%. Comparing base (1b042c7) to head (b8154f2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #61 +/- ## ========================================== + Coverage 95.89% 96.29% +0.39% ========================================== Files 50 50 Lines 4533 4557 +24 ========================================== + Hits 4347 4388 +41 + Misses 186 169 -17 ```

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Bencher

Report	Thu, March 21, 2024 at 23:47:17 UTC
Project	theseus-rs/rsql
Branch	test-coverage
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
postgresql	➖ (view plot)	797660000.000
sqlite	➖ (view plot)	259460.000

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