Add manual tests for add command to DG

[hingen]

No description provided.

[codecov]

Codecov Report

Merging #422 (57a21d4) into master (f775740) will increase coverage by 0.37%.
The diff coverage is n/a.

❗ Current head 57a21d4 differs from pull request most recent head 4c34892. Consider uploading reports for the commit 4c34892 to get more accurate results

@@             Coverage Diff              @@
##             master     #422      +/-   ##
============================================
+ Coverage     74.78%   75.16%   +0.37%     
- Complexity     1085     1094       +9     
============================================
  Files           141      141              
  Lines          3796     3793       -3     
  Branches        552      552              
============================================
+ Hits           2839     2851      +12     
+ Misses          783      777       -6     
+ Partials        174      165       -9     

see 5 files with indirect coverage changes

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