Improved tests code coverage

[leferrad]

This PR is intended to improved the code coverage resulting from tests

[codecov]

Codecov Report

Merging #13 (485293f) into master (bce041e) will increase coverage by 15.30%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #13       +/-   ##
===========================================
+ Coverage   80.76%   96.07%   +15.30%     
===========================================
  Files           1        1               
  Lines          52       51        -1     
===========================================
+ Hits           42       49        +7     
+ Misses         10        2        -8     

Impacted Files	Coverage Δ
src/tesseract.jl	96.07% <0.00%> (+15.30%)	⬆️

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