Adapt comp image tests

[nilseling]

I noticed that I never managed to induce spillover in images in a correct way for the unit tests. This is now more elegant and checks the spillover correction correctly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e63cbf9) 87.31% compared to head (832e8f1) 87.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel      #84   +/-   ##
=======================================
  Coverage   87.31%   87.31%           
=======================================
  Files          18       18           
  Lines        2751     2751           
=======================================
  Hits         2402     2402           
  Misses        349      349           

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[lassedochreden]

Hi @nilseling, this looks good and well tested to me now. Yet R CMD Check is failing right now - Will leave a comment on that in the conversation.

[lassedochreden]

Hi @nilseling, as you can see R CMD Check is failing due to Cache PhantomJS (Error: Input required and not supplied: path). Furthermore, there are two deprecation warnings from set-output and node12.

Can you comment on that and potentially fix it?

Thanks in advance for clarifying!

[nilseling]

So the build issue on devel is due to a bunch of packages not being available at the moment. I'm not fully sure why this is but I think we can ignore this for now.