Reduce use of xtl_clone in tests

[SandrineP]

Fix #109
Reduce use of xtl_clone in tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.79%. Comparing base (054814f) to head (c29f989).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
- Coverage   86.83%   86.79%   -0.05%     
==========================================
  Files          60       60              
  Lines        2340     2340              
  Branches      276      275       -1     
==========================================
- Hits         2032     2031       -1     
- Misses        308      309       +1     

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