FilterLegacyTest.php

<?php

namespace Drupal\Tests\filter\Kernel;

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests Filter module's legacy code.
 *
 * @group filter
 * @group legacy
 */
class FilterLegacyTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'filter',
    ];
    
    /**
     * Tests filter_form_access_denied() deprecation.
     *
     * @expectedDeprecation filter_form_access_denied() is deprecated in Drupal 8.8.0 and will be removed before Drupal 9.0.0. Use \Drupal\filter\Element\TextFormat::accessDeniedCallback() instead. See https://www.drupal.org/node/2966725
     */
    public function testFilterFormAccessDenied() {
        $element = filter_form_access_denied([]);
        $this->assertEquals('This field has been disabled because you do not have sufficient permissions to edit it.', $element['#value']);
    }

}