Add test for roulette

[aloctavodia]

closes #132

[codecov-commenter]

Codecov Report

Merging #164 (6772a1e) into main (580b856) will increase coverage by 5.75%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   79.95%   85.70%   +5.75%     
==========================================
  Files          20       23       +3     
  Lines        2370     2393      +23     
==========================================
+ Hits         1895     2051     +156     
+ Misses        475      342     -133     

Impacted Files	Coverage Δ
preliz/__init__.py	100.00% <100.00%> (ø)
preliz/predictive/__init__.py	100.00% <100.00%> (ø)
preliz/predictive/ppa.py	10.29% <100.00%> (ø)
preliz/tests/test_roulette.py	100.00% <100.00%> (ø)
preliz/unidimensional/__init__.py	100.00% <100.00%> (ø)
preliz/unidimensional/maxent.py	78.94% <100.00%> (ø)
preliz/unidimensional/mle.py	94.44% <100.00%> (ø)
preliz/unidimensional/quartile.py	88.00% <100.00%> (ø)
preliz/unidimensional/roulette.py	75.30% <100.00%> (ø)
preliz/utils/utils.py	90.80% <0.00%> (+10.34%)	⬆️
... and 2 more

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