TestLayoutMainFooter.php

<?php

namespace Drupal\field_layout_test\Plugin\Layout;

use Drupal\Core\Layout\Attribute\Layout;
use Drupal\Core\Layout\LayoutDefault;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Provides an attributed layout plugin for field_layout tests.
 */
class TestLayoutMainFooter extends LayoutDefault {
    
    /**
     * {@inheritdoc}
     */
    public function defaultConfiguration() {
        return [
            'setting_1' => 'Default',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function calculateDependencies() {
        $dependencies = parent::calculateDependencies();
        $dependencies['module'][] = 'system';
        return $dependencies;
    }

}