node_layout_preview_test.module

<?php
/**
 * @file
 * Node layout preview test module.
 */

/**
 * Implements hook_config_info().
 */
function node_layout_preview_test_config_info() {
  $prefixes['layout.layout.node_layout_preview_test'] = array(
    'label' => t('Node Layout Preview Test Layout'),
    'group' => t('Layouts'),
  );
  return $prefixes;
}