Add some nativeaot test cases

[codecov[bot]]

Codecov Report

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

Project coverage is 96.91%. Comparing base (39223d3) to head (ed1935b).

Additional details and impacted files

[](https://app.codecov.io/gh/jamescourtney/FlatSharp/pull/426?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=James+Courtney) ```diff @@ Coverage Diff @@ ## main #426 +/- ## ======================================= Coverage 96.91% 96.91% ======================================= Files 126 126 Lines 9695 9695 Branches 786 786 ======================================= Hits 9396 9396 Misses 208 208 Partials 91 91 ``` ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/jamescourtney/FlatSharp/pull/426?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=James+Courtney). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=James+Courtney) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/jamescourtney/FlatSharp/pull/426?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=James+Courtney). Last update [39223d3...ed1935b](https://app.codecov.io/gh/jamescourtney/FlatSharp/pull/426?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=James+Courtney). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=James+Courtney).