Add more tests

[fabacino]

No description provided.

[codecov-io]

Codecov Report

Merging #2 into master will increase coverage by 28.3%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master       #2      +/-   ##
============================================
+ Coverage     69.81%   98.11%   +28.3%     
  Complexity       22       22              
============================================
  Files             2        2              
  Lines            53       53              
============================================
+ Hits             37       52      +15     
+ Misses           16        1      -15

Impacted Files	Coverage Δ	Complexity Δ
src/Debug.php	97.95% <0%> (+26.53%)	22% <0%> (ø)	⬇️
src/debug-functions.php	100% <0%> (+50%)	0% <0%> (ø)	⬇️

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