[WIP] cleaning, fixing tests

[djarecka]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

Checklist

• I have added tests to cover my changes (if necessary)
• I have updated documentation (if necessary)

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (bd76c3d) 78.48% compared to head (a99494a) 82.70%.
Report is 1 commits behind head on rf/environments.

❗ Current head a99494a differs from pull request most recent head 8d60dd1. Consider uploading reports for the commit 8d60dd1 to get more accurate results

Additional details and impacted files

@@                 Coverage Diff                 @@
##           rf/environments     #718      +/-   ##
===================================================
+ Coverage            78.48%   82.70%   +4.21%     
===================================================
  Files                   23       23              
  Lines                 4904     4857      -47     
  Branches              1402        0    -1402     
===================================================
+ Hits                  3849     4017     +168     
+ Misses                 859      840      -19     
+ Partials               196        0     -196     

Flag	Coverage Δ
unittests	82.70% <87.50%> (+4.34%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
pydra/engine/specs.py	94.82% <ø> (+7.59%)	⬆️
pydra/engine/task.py	96.63% <100.00%> (+16.63%)	⬆️
pydra/engine/environments.py	70.58% <85.00%> (-8.11%)	⬇️

... and 15 files with indirect coverage changes

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