PhpUnitCompatibilityTrait.php

<?php

namespace Drupal\Tests;

use Drupal\TestTools\PhpUnitCompatibility\RunnerVersion;
// In order to manage different method signatures between PHPUnit versions, we
// dynamically load a compatibility trait dependent on the PHPUnit runner
// version.
class_alias("Drupal\\TestTools\\PhpUnitCompatibility\\PhpUnit" . RunnerVersion::getMajor() . "\\TestCompatibilityTrait", 'Drupal\\Tests\\PhpUnitCompatibilityTrait');
// Allow static analysis to find a trait.
if (FALSE) {
    
    /**
     * Makes Drupal's test API forward compatible with multiple versions of PHPUnit.
     */
    trait PhpUnitCompatibilityTrait {

}
}