PageCacheTagsTestBase.php

<?php

namespace Drupal\Tests\system\Functional\Cache;

use Drupal\Core\Url;
use Drupal\Tests\BrowserTestBase;

/**
 * Provides helper methods for page cache tags tests.
 */
abstract class PageCacheTagsTestBase extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // Enable page caching.
        $config = $this->config('system.performance');
        $config->set('cache.page.max_age', 3600);
        $config->save();
    }
    
    /**
     * Verify that when loading a given page, it's a page cache hit or miss.
     *
     * @param \Drupal\Core\Url $url
     *   The page for this URL will be loaded.
     * @param string $hit_or_miss
     *   'HIT' if a page cache hit is expected, 'MISS' otherwise.
     * @param array|false $tags
     *   When expecting a page cache hit, you may optionally specify an array of
     *   expected cache tags. While FALSE, the cache tags will not be verified.
     */
    protected function verifyPageCache(Url $url, $hit_or_miss, $tags = FALSE) {
        $this->drupalGet($url);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', $hit_or_miss);
        if ($hit_or_miss === 'HIT' && is_array($tags)) {
            $absolute_url = $url->setAbsolute()
                ->toString();
            $cid_parts = [
                $absolute_url,
                '',
            ];
            $cid = implode(':', $cid_parts);
            $cache_entry = \Drupal::cache('page')->get($cid);
            sort($cache_entry->tags);
            $tags = array_unique($tags);
            sort($tags);
            $this->assertSame($cache_entry->tags, $tags);
        }
    }
    
    /**
     * Verify that when loading a given page, it's a page cache hit or miss.
     *
     * @param \Drupal\Core\Url $url
     *   The page for this URL will be loaded.
     * @param string $hit_or_miss
     *   'HIT' if a page cache hit is expected, 'MISS' otherwise.
     */
    protected function verifyDynamicPageCache(Url $url, $hit_or_miss) {
        $this->drupalGet($url);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Dynamic-Cache', $hit_or_miss);
    }

}