Add tests for config

[dvermd]

What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update
• Other: Add tests for config class

Description

Testing dereference* functions is not part of this PR. Only public methods are tested.

Related Issues & Documents

Documentation (check all applicable)

• This PR requires changes to the Wiki documentation (describe the changes)
• This PR requires changes to the documentation inside the git repo (please add them to the PR).
• Does not require documentation changes

[codecov]

Codecov Report

Merging #2976 (4bd3cfa) into master (2cd0809) will increase coverage by 1.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2976      +/-   ##
==========================================
+ Coverage   12.69%   14.17%   +1.47%     
==========================================
  Files         160      160              
  Lines       12530    12532       +2     
==========================================
+ Hits         1591     1776     +185     
+ Misses      10939    10756     -183     

Flag	Coverage Δ
unittests	14.17% <ø> (+1.47%)	⬆️

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see 4 files with indirect coverage changes