AutoconfigurationTest.php

<?php

declare (strict_types=1);
namespace Drupal\KernelTests\Core\DependencyInjection;

use Drupal\Core\Serialization\Yaml;
use Drupal\KernelTests\FileSystemModuleDiscoveryDataProviderTrait;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests autoconfiguration of services.
 *
 * @group DependencyInjection
 */
class AutoconfigurationTest extends KernelTestBase {
    use FileSystemModuleDiscoveryDataProviderTrait;
    
    /**
     * Tests that core services do not use tags if autoconfiguration is enabled.
     */
    public function testCoreServiceTags() : void {
        $filenames = array_map(fn($module) => "core/modules/{$module[0]}/{$module[0]}.services.yml", $this->coreModuleListDataProvider());
        $filenames[] = 'core/core.services.yml';
        foreach (array_filter($filenames, 'file_exists') as $filename) {
            $services = Yaml::decode(file_get_contents($filename))['services'];
            if (!empty($services['_defaults']['autoconfigure'])) {
                foreach ($services as $id => $service) {
                    if (is_array($service) && isset($service['tags'])) {
                        foreach ($service['tags'] as $tag) {
                            $tag_name = is_string($tag) ? $tag : $tag['name'];
                            $this->assertNotEquals('event_subscriber', $tag_name, "Service '{$id}' in {$filename} should not be tagged with 'event_subscriber'.");
                        }
                    }
                }
            }
        }
    }

}