Additional test coverage for elliptic curve implementations

[brian-pane]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 143 untouched benchmarks

---

_{Comparing brian-pane:test-cov-ecc (3f3e7ca) with main (f6150cf)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.68%. Comparing base (f6150cf) to head (3f3e7ca).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   99.64%   99.68%   +0.04%     
==========================================
  Files         170      170              
  Lines       39559    39583      +24     
==========================================
+ Hits        39419    39459      +40     
+ Misses        140      124      -16     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ctz]

Thanks!