test: correct extract test implementations

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Bencher

Report	Mon, July 1, 2024 at 19:26:12 UTC
Project	theseus-rs/postgresql-embedded
Branch	correct-tests
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
extract	➖ (view plot)	154,050.00
lifecycle	➖ (view plot)	1,398,600,000.00

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Codecov Report

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

Project coverage is 99.49%. Comparing base (f43280f) to head (98e6df9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #97 +/- ## ======================================= Coverage 99.49% 99.49% ======================================= Files 83 83 Lines 8737 8737 ======================================= Hits 8693 8693 Misses 44 44 ```

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