CacheabilityMetadataConfigOverrideIntegrationTest.php

<?php

namespace Drupal\Tests\config\Functional;

use Drupal\Tests\BrowserTestBase;
use Drupal\Tests\system\Functional\Cache\AssertPageCacheContextsAndTagsTrait;

/**
 * Tests if configuration overrides correctly affect cacheability metadata.
 *
 * @group config
 */
class CacheabilityMetadataConfigOverrideIntegrationTest extends BrowserTestBase {
    use AssertPageCacheContextsAndTagsTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'block_test',
        'config_override_integration_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // @todo If our block does not contain any content then the cache context
        //   is not bubbling up and the test fails. Remove this line once the cache
        //   contexts are properly set. See https://www.drupal.org/node/2529980.
        \Drupal::state()->set('block_test.content', 'Needs to have some content');
        $this->drupalLogin($this->drupalCreateUser());
    }
    
    /**
     * Tests if config overrides correctly set cacheability metadata.
     */
    public function testConfigOverride() {
        // Check the default (disabled) state of the cache context. The block label
        // should not be overridden.
        $this->drupalGet('<front>');
        $this->assertSession()
            ->pageTextNotContains('Overridden block label');
        // Both the cache context and tag should be present.
        $this->assertCacheContext('config_override_integration_test');
        $this->assertSession()
            ->responseHeaderContains('X-Drupal-Cache-Tags', 'config_override_integration_test_tag');
        // Flip the state of the cache context. The block label should now be
        // overridden.
        \Drupal::state()->set('config_override_integration_test.enabled', TRUE);
        $this->drupalGet('<front>');
        $this->assertSession()
            ->pageTextContains('Overridden block label');
        // Both the cache context and tag should still be present.
        $this->assertCacheContext('config_override_integration_test');
        $this->assertSession()
            ->responseHeaderContains('X-Drupal-Cache-Tags', 'config_override_integration_test_tag');
    }

}