Swift testing

[adam-fowler]

Jobs are running in parallel now.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.09%. Comparing base (bd77418) to head (9211c8b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
- Coverage   91.02%   88.09%   -2.94%     
==========================================
  Files           8        8              
  Lines         568      571       +3     
==========================================
- Hits          517      503      -14     
- Misses         51       68      +17     

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