[BF] Fix tests

[arnaudbore]

Quick description

Please include a summary of the changes and the related issue(s) or improvement(s).
Please also include relevant motivation and context. List any dependencies that are required for this change if needed.

...

Type of change

Check the relevant options.

• 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 not work as expected)
• This change requires a documentation update

Provide data, screenshots, command line to test (if relevant)

...

Checklist

• My code follows the style guidelines of this project (run autopep8)
• I added relevant citations to scripts, modules and functions docstrings and descriptions
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I moved all functions from the script file (except the argparser and main) to scilpy modules
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.58%. Comparing base (095637c) to head (c51f80b).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1280   +/-   ##
=======================================
  Coverage   72.58%   72.58%           
=======================================
  Files         294      294           
  Lines       25328    25328           
  Branches     3546     3546           
=======================================
  Hits        18385    18385           
+ Misses       5448     5447    -1     
- Partials     1495     1496    +1     

Flag	Coverage Δ
smoketests	69.77% <ø> (ø)
unittests	13.28% <ø> (ø)

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

Components	Coverage Δ
Scripts	75.43% <ø> (ø)
Library	69.19% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.