Better integration tests, with correct exit status checks

[stronk7]

There were a few problems with the integration checks, not properly detecting & asserting the expected exit statuses. Plus some problem using runner.os that uses different names (Linux, Windows, macOS), so switching to matrix.os

Now they are better checked, with some output added to explain the problem when the script runs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.90%. Comparing base (1ec84f4) to head (cb7f4ad).

❗ Current head cb7f4ad differs from pull request most recent head ef0b764. Consider uploading reports for the commit ef0b764 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #161   +/-   ##
=========================================
  Coverage     97.90%   97.90%           
  Complexity      850      850           
=========================================
  Files            37       37           
  Lines          2524     2524           
=========================================
  Hits           2471     2471           
  Misses           53       53           

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[stronk7]

Tata!