Restructuring files

[aptakhin]

• Added test by filename
• Added comparator

[codecov]

Codecov Report

Merging #1 into master will increase coverage by 3.38%.
The diff coverage is 94.82%.

@@            Coverage Diff             @@
##           master       #1      +/-   ##
==========================================
+ Coverage   91.41%   94.80%   +3.38%     
==========================================
  Files          20       13       -7     
  Lines         233      231       -2     
==========================================
+ Hits          213      219       +6     
+ Misses         20       12       -8     

Flag	Coverage Δ
#unittests	94.80% <94.82%> (+3.38%)	⬆️

Impacted Files	Coverage Δ
regress/ext/simple.py	0.00% <ø> (ø)
regress/impl/canonize_policies.py	90.00% <80.00%> (ø)
regress/regress.py	89.13% <84.84%> (-10.87%)	⬇️
regress/base.py	100.00% <100.00%> (ø)
regress/ext/pytest.py	100.00% <100.00%> (+6.25%)	⬆️
regress/fixture.py	100.00% <100.00%> (+9.09%)	⬆️
regress/impl/serializer/json_serializer.py	100.00% <100.00%> (ø)
regress/impl/serializer/pickle_serializer.py	100.00% <100.00%> (ø)
regress/impl/serializer/string_serializer.py	100.00% <100.00%> (ø)
regress/impl/storages.py	100.00% <100.00%> (ø)
... and 5 more

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