test: add more tests

[caarlos0]

increased test coverage a bit

[codecov]

Codecov Report

Merging #3 (911b371) into main (f0ce40e) will increase coverage by 4.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   78.57%   82.85%   +4.28%     
==========================================
  Files           2        2              
  Lines          70       70              
==========================================
+ Hits           55       58       +3     
+ Misses          8        6       -2     
+ Partials        7        6       -1     

Impacted Files	Coverage Δ
glob.go	79.16% <0.00%> (+6.25%)	⬆️

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