After a bit of searching I found out how to enable deprecation warnings in CI runs.
However, when I tried it out I discovered that any deprecation warnings during the tests cause the build to fail instead of passing with warnings, as I’d hoped (see the fourth of that MR’s pipelines).
Unfortunately, the documentation only explains how to make it fail on deprecations, which already seems to be the default (unless I have unwittingly made a customization in my module that caused this behavior).
Is there an easy way to make deprecation warnings during PHPUnit test runs just produce CI warnings, not cause the build to fail?
Active
gitlab-ci
I believe that the behaviour comes because of this line in the core phpunit.xml.dist: https://git.drupalcode.org/project/drupal/-/blob/11.x/core/phpunit.xml.d...
failOnWarning="true"
You'd need to override that value to false for your module somehow.
Given that the core's default value is set to fail and that each module can add their own phpunit.xml(.dist) file, I'm closing this as "Work as designed".