There are varying reports of xdebug breakpoints not stopping in web requests made from BrowserTestBase tests (eg, code executed via drupalGet, etc).
I am able to reproduce this locally running the latest 8.4.x, with PhpStorm xdebug connections set to 10, and xdebug.remote_autostart=1. Normal debugging works just fine (including stepping into WebTestBase web requests).
This is purportedly due to those tests utilizing PHPUnit's "run in separate process" functionality, which causes the code to be serialized php that is executed, and thus preventing IDEs from having appropriate code mappings.
There is a PR for PHPUnit to write these out to files so IDEs can do the appropriate mappings.
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The change/bugfix cannot be fully demonstrated by automated testing, and thus requires manual testing in a variety of environments.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Any news?
There is no way to debug tests.
Taking from commercial #3, in ./vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/ImplicitlyIgnoredAnnotationNames.php change runTestsInSeparateProcesses to false and debugging works.
This should be a support request, it definitely works if things are set up correctly :)