test: add extra test

[Stranger6667]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #871 will not alter performance

_{Comparing dd/extra-doc (9c1827f) with master (6d001bb)}

Summary

✅ 61 untouched

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.92%. Comparing base (6d001bb) to head (9c1827f).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #871      +/-   ##
==========================================
+ Coverage   93.88%   93.92%   +0.03%     
==========================================
  Files          78       78              
  Lines       15992    16021      +29     
==========================================
+ Hits        15014    15047      +33     
+ Misses        978      974       -4     

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