add tests

[Flipez]

Signed-off-by: Flipez code@brauser.io

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[codecov]

Codecov Report

Merging #78 (2f8ed13) into master (0900363) will increase coverage by 1.89%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   83.61%   85.50%   +1.89%     
==========================================
  Files          89       89              
  Lines        2697     2697              
==========================================
+ Hits         2255     2306      +51     
+ Misses        376      335      -41     
+ Partials       66       56      -10     

Impacted Files	Coverage Δ
utilities/utilities.go	67.50% <0.00%> (+2.50%)	⬆️
parser/function.go	92.68% <0.00%> (+14.63%)	⬆️
evaluator/infix.go	92.74% <0.00%> (+15.32%)	⬆️
evaluator/if.go	100.00% <0.00%> (+23.07%)	⬆️
evaluator/module.go	87.50% <0.00%> (+25.00%)	⬆️
evaluator/import.go	100.00% <0.00%> (+46.66%)	⬆️
evaluator/hash.go	100.00% <0.00%> (+47.36%)	⬆️

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