Fix tests on model costs

[svilupp]

No description provided.

[codecov]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Comparison is base (362aa86) 94.12% compared to head (e8f456d) 92.22%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/Experimental/RAGTools/retrieval.jl	33.33%	16 Missing ⚠️
src/Experimental/RAGTools/types.jl	75.67%	9 Missing ⚠️
src/Experimental/RAGTools/api_services.jl	0.00%	8 Missing ⚠️
src/Experimental/RAGTools/preparation.jl	98.18%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   94.12%   92.22%   -1.90%     
==========================================
  Files          29       30       +1     
  Lines        1396     1480      +84     
==========================================
+ Hits         1314     1365      +51     
- Misses         82      115      +33     

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