improve tests

[Flipez]

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

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[codecov-commenter]

Codecov Report

Merging #49 (91405c8) into master (bc92247) will increase coverage by 5.54%.
The diff coverage is 65.38%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   76.34%   81.89%   +5.54%     
==========================================
  Files          81       81              
  Lines        2266     2248      -18     
==========================================
+ Hits         1730     1841     +111     
+ Misses        476      345     -131     
- Partials       60       62       +2     

Impacted Files	Coverage Δ
ast/array.go	92.30% <ø> (+6.59%)	⬆️
ast/assign.go	85.71% <ø> (+19.04%)	⬆️
ast/ast.go	53.84% <ø> (ø)
ast/block.go	87.50% <ø> (+9.72%)	⬆️
ast/boolean.go	100.00% <ø> (+33.33%)	⬆️
ast/call.go	92.85% <ø> (+6.19%)	⬆️
ast/expression_statement.go	66.66% <ø> (+9.52%)	⬆️
ast/float.go	50.00% <ø> (+16.66%)	⬆️
ast/foreach.go	0.00% <ø> (ø)
ast/function.go	80.00% <ø> (+5.00%)	⬆️
... and 25 more

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