We are using the tox.pytest module to test our pytest plugin. Since it is importing quite a few non-standard dependencies we use the "testing" extra to include its dependencies when running tests. In tox 4.22.0 this extra was removed in favor of dependency-groups (#3409). Since there seems to be no error when using non-existent extras, our test-suits have started to fail with missing dependencies.

Since the tox.pytest module is part of the public interface (and for good reason, it is very very helpful in testing plugins), it would be very much appreciated if the testing extra could be added back to the publicly exposed interface of the package, too.