RunnerVersion.php

<?php

namespace Drupal\TestTools\PhpUnitCompatibility;

use PHPUnit\Runner\Version;

/**
 * Helper class to determine information about running PHPUnit version.
 *
 * This class contains static methods only and is not meant to be instantiated.
 */
final class RunnerVersion {
    
    /**
     * This class should not be instantiated.
     */
    private function __construct() {
    }
    
    /**
     * Returns the major version of the PHPUnit runner being used.
     *
     * @return int
     *   The major version of the PHPUnit runner being used.
     */
    public static function getMajor() {
        return (int) explode('.', Version::id())[0];
    }

}