materio-base-d7/sites/all/modules/examples/simpletest_example/simpletest_example.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the simpletest_example module.
 */

/**
 * Implements hook_install().
 *
 * @ingroup simpletest_example
 */
function simpletest_example_install() {
  // Ensure the simpletest_example node type is available.
  node_types_rebuild();
  $types = node_type_get_types();
  node_add_body_field($types['simpletest_example']);
}

/**
 * Adds a body field to the simpletest_example node type.
 *
 * @ingroup simpletest_example
 */
function simpletest_example_update_7001() {
  node_types_rebuild();
  $types = node_type_get_types();
  node_add_body_field($types['simpletest_example']);
}