test: Add tests for the FFI layer.

[iphydf]

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Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.13%. Comparing base (06fae39) to head (51087ea).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/providers/bootstrap_nodes.dart	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   77.50%   83.13%   +5.63%     
==========================================
  Files          62       62              
  Lines        2516     2520       +4     
==========================================
+ Hits         1950     2095     +145     
+ Misses        566      425     -141     

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