Fixed integration test (for good)

[cmaglie]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
  our contributing guidelines
• 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?

Fixed integration test

What is the current behavior?

What is the new behavior?

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

Other information

[alessio-perugini]

💘

[codecov]

Codecov Report

Patch coverage: 46.15% and project coverage change: -0.04% ⚠️

Comparison is base (b678f6f) 62.97% compared to head (fecebfc) 62.93%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2259      +/-   ##
==========================================
- Coverage   62.97%   62.93%   -0.04%     
==========================================
  Files         220      220              
  Lines       19501    19521      +20     
==========================================
+ Hits        12280    12286       +6     
- Misses       6137     6147      +10     
- Partials     1084     1088       +4     

Flag	Coverage Δ
unit	62.93% <46.15%> (-0.04%)	⬇️

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Files Changed	Coverage Δ
arduino/cores/packagemanager/package_manager.go	76.61% <0.00%> (-0.44%)	⬇️
arduino/resources/index.go	46.29% <33.33%> (-2.73%)	⬇️
commands/instances.go	64.43% <64.28%> (-0.27%)	⬇️

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