Add tests for xsystem and os

[tharun571]

No description provided.

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.09%. Comparing base (e788167) to head (c0fc434).
⚠️ Report is 209 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   62.66%   70.09%   +7.43%     
==========================================
  Files          15       17       +2     
  Lines         600      602       +2     
  Branches       59       59              
==========================================
+ Hits          376      422      +46     
+ Misses        224      180      -44     

Files with missing lines	Coverage Δ
src/xmagics/os.hpp	100.00% <ø> (ø)

... and 3 files with indirect coverage changes

Files with missing lines	Coverage Δ
src/xmagics/os.hpp	100.00% <ø> (ø)

... and 3 files with indirect coverage changes

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[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[vgvassilev]

LGTM!