[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[bot]]

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.

:exclamation: 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

```diff @@ 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](https://app.codecov.io/gh/nipype/pydra/pull/718/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nipype/pydra/pull/718/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype) | `82.70% <87.50%> (+4.34%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/nipype/pydra/pull/718?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype) | Coverage Δ | | |---|---|---| | [pydra/engine/specs.py](https://app.codecov.io/gh/nipype/pydra/pull/718?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#diff-cHlkcmEvZW5naW5lL3NwZWNzLnB5) | `94.82% <ø> (+7.59%)` | :arrow_up: | | [pydra/engine/task.py](https://app.codecov.io/gh/nipype/pydra/pull/718?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#diff-cHlkcmEvZW5naW5lL3Rhc2sucHk=) | `96.63% <100.00%> (+16.63%)` | :arrow_up: | | [pydra/engine/environments.py](https://app.codecov.io/gh/nipype/pydra/pull/718?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype#diff-cHlkcmEvZW5naW5lL2Vudmlyb25tZW50cy5weQ==) | `70.58% <85.00%> (-8.11%)` | :arrow_down: | ... and [15 files with indirect coverage changes](https://app.codecov.io/gh/nipype/pydra/pull/718/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nipype)

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