PHPUnit 13.4 - #[Group] attribute is ignored deprecation

Problem/Motivation

Since PHPUnit 13.4, a number of tests are failing with a PHPUnit test runner deprecation

Class-level #[Group] attribute on Drupal\Tests\Core\Routing\UrlGeneratorTest is ignored, but will be inherited by its subclasses in PHPUnit 14

PHPUnit 13 src/Metadata/Parser/AttributeParser.php has this comment:

   /**
     * In PHPUnit 14, the tests of a test class inherit the groups declared on
     * its parent classes, and their size from the nearest class that declares
     * one. An attribute on a parent class only triggers a deprecation when
     * this would change the groups or the size of the tests of the test class,
     * which is not the case when the test class itself declares the same
     * groups and a size.
     *
     * The deprecation keeps the test file of such a test class from being
     * skipped by the test index, which never skips a file that PHPUnit had
     * something to say about while it was loaded.
     *
     * @param ReflectionClass<object> $class
     */

which means that in order to prevent the deprecations, the value of the #[Group] attribute in subclasses of a concrete test class must be equal to the parent.

Steps to reproduce

Run tests under PHPUnit, see #3574681: [Nov 2026] Introduce support for PHPUnit 13.5.

Proposed resolution

Make the #[Group] attributes of tests that inherit from other tests equal to the parent's ones.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet