Test iterators

[andreiavrammsd]

• Test iterators
• Add documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e9e5db9) to head (1e9eb3c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##           master        #2       +/-   ##
============================================
+ Coverage   83.12%   100.00%   +16.87%     
============================================
  Files           1         1               
  Lines         160       167        +7     
============================================
+ Hits          133       167       +34     
+ Misses         27         0       -27     

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