add first chunking tests

[arjunsavel]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f91a886) 61.68% compared to head (581bcf1) 68.48%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/cortecs/opac/chunking.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   61.68%   68.48%   +6.80%     
==========================================
  Files          17       17              
  Lines         882      882              
==========================================
+ Hits          544      604      +60     
+ Misses        338      278      -60     

Flag	Coverage Δ
unittests	68.48% <83.33%> (+6.80%)	⬆️

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