Tests for the #[export] macro

[andybalaam]

I thought there was a bug in the #[export] macro so I wrote some tests. It seems to be fine, but the tests are hopefully still useful.

• This PR makes no API changes so needs no changelog entry
• No AI was used to make this PR

[andybalaam]

@poljar is it OK for me to set tests = true in bindings/matrix-sdk-ffi-macros/Cargo.toml? (This PR does that, so I can run the tests.)

[poljar]

@poljar is it OK for me to set tests = true in bindings/matrix-sdk-ffi-macros/Cargo.toml? (This PR does that, so I can run the tests.)

I think you can also just remove that line, yes it's fine.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.94%. Comparing base (4c15c79) to head (cdc3d6b).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6691      +/-   ##
==========================================
+ Coverage   89.92%   89.94%   +0.01%     
==========================================
  Files         398      398              
  Lines      111154   111154              
  Branches   111154   111154              
==========================================
+ Hits        99952    99972      +20     
+ Misses       7403     7390      -13     
+ Partials     3799     3792       -7     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

[codspeed-hq]

Merging this PR will improve performance by 48.63%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 49 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	Restore session [memory store]	168.5 ms	113.4 ms	+48.63%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing andybalaam/test-export-macro (cdc3d6b) with main (4c15c79)¹}

Footnotes

1. No successful run was found on main (82585d7) during the generation of this report, so 4c15c79 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩