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;
  }

}