test: Extend and speed up scan tests

[mickvangelderen]

Ensure files contain multiple chunks where the format supports it. Add more tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.21%. Comparing base (066c262) to head (f64610c).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15127      +/-   ##
==========================================
+ Coverage   81.08%   81.21%   +0.13%     
==========================================
  Files        1342     1346       +4     
  Lines      174150   175111     +961     
  Branches     2459     2459              
==========================================
+ Hits       141210   142222    +1012     
+ Misses      32473    32423      -50     
+ Partials      467      466       -1     

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