Improve coverage testing

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[codecov]

Codecov Report

Merging #194 (2695016) into dev (1148f55) will increase coverage by 11.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #194       +/-   ##
===========================================
+ Coverage   80.79%   91.80%   +11.00%     
===========================================
  Files          42       42               
  Lines        1234     1232        -2     
===========================================
+ Hits          997     1131      +134     
+ Misses        237      101      -136     

Impacted Files	Coverage Δ
gptcache/similarity_evaluation/__init__.py	100.00% <ø> (+16.66%)	⬆️
gptcache/utils/__init__.py	86.20% <ø> (+6.89%)	⬆️
gptcache/utils/error.py	90.90% <ø> (+5.19%)	⬆️
gptcache/embedding/__init__.py	100.00% <100.00%> (+15.00%)	⬆️
gptcache/embedding/huggingface.py	85.71% <100.00%> (ø)
gptcache/embedding/sbert.py	100.00% <100.00%> (+4.54%)	⬆️
gptcache/manager/vector_data/chroma.py	84.84% <100.00%> (+0.47%)	⬆️

... and 8 files with indirect coverage changes