Add test_load_functions from 'load_factory_dims' PR#6168

[pp-mo]

To confirm that these tests capture the legacy behaviours.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.84%. Comparing base (b15e3e2) to head (94c75d2).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6191      +/-   ##
==========================================
+ Coverage   89.82%   89.84%   +0.02%     
==========================================
  Files          88       88              
  Lines       23185    23211      +26     
  Branches     4314     4316       +2     
==========================================
+ Hits        20825    20854      +29     
+ Misses       1628     1626       -2     
+ Partials      732      731       -1     

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[pp-mo]

Not to merge, just comforting that it passes.