DatabaseBackendTagTest.php

<?php

namespace Drupal\KernelTests\Core\Cache;

use Drupal\Core\Cache\Cache;
use Drupal\Core\Database\Database;
use Drupal\Core\DependencyInjection\ContainerBuilder;
use Drupal\KernelTests\KernelTestBase;
use Symfony\Component\DependencyInjection\Reference;

/**
 * Tests DatabaseBackend cache tag implementation.
 *
 * @group Cache
 */
class DatabaseBackendTagTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'system',
    ];
    
    /**
     * {@inheritdoc}
     */
    public function register(ContainerBuilder $container) {
        parent::register($container);
        // Change container to database cache backends.
        $container->register('cache_factory', 'Drupal\\Core\\Cache\\CacheFactory')
            ->addArgument(new Reference('settings'))
            ->addMethodCall('setContainer', [
            new Reference('service_container'),
        ]);
    }
    public function testTagInvalidations() {
        // Create cache entry in multiple bins.
        $tags = [
            'test_tag:1',
            'test_tag:2',
            'test_tag:3',
        ];
        $bins = [
            'data',
            'bootstrap',
            'render',
        ];
        foreach ($bins as $bin) {
            $bin = \Drupal::cache($bin);
            $bin->set('test', 'value', Cache::PERMANENT, $tags);
            $this->assertNotEmpty($bin->get('test'), 'Cache item was set in bin.');
        }
        $connection = Database::getConnection();
        $invalidations_before = intval($connection->select('cachetags')
            ->fields('cachetags', [
            'invalidations',
        ])
            ->condition('tag', 'test_tag:2')
            ->execute()
            ->fetchField());
        Cache::invalidateTags([
            'test_tag:2',
        ]);
        // Test that cache entry has been invalidated in multiple bins.
        foreach ($bins as $bin) {
            $bin = \Drupal::cache($bin);
            $this->assertFalse($bin->get('test'), 'Tag invalidation affected item in bin.');
        }
        // Test that only one tag invalidation has occurred.
        $invalidations_after = intval($connection->select('cachetags')
            ->fields('cachetags', [
            'invalidations',
        ])
            ->condition('tag', 'test_tag:2')
            ->execute()
            ->fetchField());
        $this->assertEquals($invalidations_before + 1, $invalidations_after, 'Only one addition cache tag invalidation has occurred after invalidating a tag used in multiple bins.');
    }

}