Add Test System with Fuel Cost TimeSeries

[rodrigomha]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.31%. Comparing base (d387fa0) to head (1638792).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
- Coverage   94.41%   94.31%   -0.10%     
==========================================
  Files          15       15              
  Lines        3385     3449      +64     
==========================================
+ Hits         3196     3253      +57     
- Misses        189      196       +7     

Flag	Coverage Δ
unittests	94.31% <100.00%> (-0.10%)	⬇️

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Files with missing lines	Coverage Δ
src/library/psitest_library.jl	99.29% <100.00%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes