Add tests to Autofill (and tidy current ones)

[OCopping]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.45%. Comparing base (fb3ebb4) to head (06a41db).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
+ Coverage   81.72%   89.45%   +7.72%     
==========================================
  Files           9        9              
  Lines         673      673              
==========================================
+ Hits          550      602      +52     
+ Misses        123       71      -52     

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