Porting legacy tests to new integration-test infra (part 3...)

[cmaglie]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Ported tests from the legacy infrastructure to the current one.

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change, and is titled accordingly?

Other information

[codecov]

Codecov Report

Patch coverage: 94.11% and project coverage change: +0.01% 🎉

Comparison is base (72c32ca) 63.35% compared to head (3d8d37d) 63.37%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2300      +/-   ##
==========================================
+ Coverage   63.35%   63.37%   +0.01%     
==========================================
  Files         214      214              
  Lines       19569    19551      -18     
==========================================
- Hits        12398    12390       -8     
+ Misses       6084     6075       -9     
+ Partials     1087     1086       -1     

Flag	Coverage Δ
unit	63.37% <94.11%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
legacy/builder/test/helper.go	79.16% <66.66%> (+19.64%)	⬆️
legacy/builder/test/helper_tools_downloader.go	60.80% <100.00%> (ø)

... and 4 files with indirect coverage changes

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