Improvemements to compile tests

[martinmodrak]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

Improves tests, resolves #835

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):
Institute of Microbiology of the Czech Academy of Sciences

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[jgabry]

I just merged master in to this and will rerun all the checks. If those pass I think this is good to go.

[codecov-commenter]

Codecov Report

Merging #836 (52b55fa) into master (b29374e) will increase coverage by 0.14%.
Report is 4 commits behind head on master.
The diff coverage is 67.24%.

❗ Current head 52b55fa differs from pull request most recent head 121abd0. Consider uploading reports for the commit 121abd0 to get more accurate results

@@            Coverage Diff             @@
##           master     #836      +/-   ##
==========================================
+ Coverage   88.10%   88.24%   +0.14%     
==========================================
  Files          12       12              
  Lines        4212     4212              
==========================================
+ Hits         3711     3717       +6     
+ Misses        501      495       -6     

Files Changed	Coverage Δ
R/model.R	91.78% <67.24%> (+0.39%)	⬆️

... and 1 file with indirect coverage changes

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