Porting legacy tests to new integration-test infra (part 1...)

[cmaglie]

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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 a lot of test 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 has no change and project coverage change: -0.13% ⚠️

Comparison is base (3f9373a) 63.40% compared to head (c4f9601) 63.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2294      +/-   ##
==========================================
- Coverage   63.40%   63.27%   -0.13%     
==========================================
  Files         219      219              
  Lines       19536    19536              
==========================================
- Hits        12386    12361      -25     
- Misses       6069     6091      +22     
- Partials     1081     1084       +3     

Flag	Coverage Δ
unit	63.27% <ø> (-0.13%)	⬇️

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see 4 files with indirect coverage changes

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