add GSL test

[Konstantin8105]

No description provided.

[codecov-io]

Codecov Report

Merging #81 into master will decrease coverage by 0.89%.
The diff coverage is 1.01%.

@@            Coverage Diff            @@
##           master      #81     +/-   ##
=========================================
- Coverage   88.11%   87.21%   -0.9%     
=========================================
  Files         167      168      +1     
  Lines        9437     9534     +97     
=========================================
  Hits         8315     8315             
- Misses        770      867     +97     
  Partials      352      352

Impacted Files	Coverage Δ
travis/gcc.log.go	0% <0%> (ø)
main.go	76.31% <100%> (+0.39%)	⬆️

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