Add more tests

[eliascarv]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.79%. Comparing base (3ddf199) to head (70e7364).

Files with missing lines	Patch %	Lines
src/avl.jl	81.81%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##             main       #2       +/-   ##
===========================================
+ Coverage   55.65%   95.79%   +40.14%     
===========================================
  Files           2        2               
  Lines         115      119        +4     
===========================================
+ Hits           64      114       +50     
+ Misses         51        5       -46     

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