layout_test.module

<?php

/**
 * @file
 * Layout testing module.
 */

/**
 * Implementation of hook_menu().
 */
function layout_test_menu() {
  $items = array();
  $items['layout-test'] = array(
    'title' => 'Layout test',
    'page callback' => 'layout_test_page',
    'access callback' => TRUE,
  );
  return $items;
}

/**
 * Page callback for layout testing.
 */
function layout_test_page() {

  // Hack to enable and apply the theme to this page and manually invoke its
  // layout plugin and render it.
  global $theme;
  $theme = 'layout_test_theme';
  theme_enable(array(
    $theme,
  ));
  $display = entity_load('display', 'test_twocol');
  $layout = $display
    ->getLayoutInstance();

  // @todo This tests that the layout can render its regions, but does not test
  //   block rendering: http://drupal.org/node/1812720.
  // Add sample content in the regions that is looked for in the tests.
  $regions = $layout
    ->getRegions();
  foreach ($regions as $region => $info) {
    $regions[$region] = '<h3>' . $info['label'] . '</h3>';
  }
  return $layout
    ->renderLayout(FALSE, $regions);
}

/**
 * Implements hook_system_theme_info().
 */
function layout_test_system_theme_info() {
  $themes['layout_test_theme'] = drupal_get_path('module', 'layout_test') . '/themes/layout_test_theme/layout_test_theme.info';
  return $themes;
}