Doctests for more scripts

[gyermolenko]

No description provided.

[codecov-io]

Codecov Report

Merging #292 into master will decrease coverage by 11.07%.
The diff coverage is 5.88%.

@@             Coverage Diff             @@
##           master     #292       +/-   ##
===========================================
- Coverage   45.51%   34.44%   -11.08%     
===========================================
  Files          41       41               
  Lines        1584     1533       -51     
===========================================
- Hits          721      528      -193     
- Misses        863     1005      +142

Impacted Files	Coverage Δ
patterns/behavioral/chaining_method.py	0% <0%> (-95.66%)	⬇️
patterns/behavioral/iterator.py	0% <0%> (-94.45%)	⬇️
patterns/behavioral/strategy.py	0% <0%> (-96.3%)	⬇️
patterns/behavioral/mediator.py	0% <0%> (-95.46%)	⬇️
patterns/behavioral/catalog.py	0% <0%> (-86.37%)	⬇️
patterns/behavioral/visitor.py	0% <0%> (-97.15%)	⬇️
patterns/behavioral/command.py	88.88% <33.33%> (-8.09%)	⬇️
... and 3 more

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