Refactor/unittests

[dennisbader]

Summary

• refactor unit tests to use pytest instead of unit test
• add common pytest fixtures (decorators) to conftest.py
• parametrize the heavy tests tests

[madtoinou]

Nice! The tests look much nicer, the improve granularity will for sure help us pinpoint the problematic use-case.

Few comments to make some assert more intuitive.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b1290cb) 93.83% compared to head (c668f94) 93.84%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1950   +/-   ##
=======================================
  Coverage   93.83%   93.84%           
=======================================
  Files         132      132           
  Lines       12731    12717   -14     
=======================================
- Hits        11946    11934   -12     
+ Misses        785      783    -2     

see 8 files with indirect coverage changes

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