Add tests for scenarios where tests are running in separate processes

[mvorisek]

extracted from #380

runInSeparateProcess is executed very differently, so test it, fixes will be done in #380

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f9fc12a) 66.66% compared to head (c0caef1) 66.66%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #412   +/-   ##
=========================================
  Coverage     66.66%   66.66%           
  Complexity       92       92           
=========================================
  Files            21       21           
  Lines           459      459           
=========================================
  Hits            306      306           
  Misses          153      153           

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[localheinz]

@mvorisek

Can you rebase and explain what you are trying to achieve?

[mvorisek]

Rebased. This PR adds testing of PHPUnit runInSeparateProcess which is processed very differently [1], for example per class setup is fired per each test, thus it should contribute to per test duration. All will be fixed in #380, but let's land this testing separately.

[1] https://github.com/sebastianbergmann/phpunit/blob/10.5.3/src/Framework/TestCase.php#L639

[localheinz]

Thank you, @mvorisek!