materio-base-d7/modules/simpletest/tests/system_test.install

<?php

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

/**
 * Implements hook_schema().
 */
function system_test_schema() {
  // Trigger a search for a module in the filesystem when requested by
  // system_test_drupal_get_filename_with_schema_rebuild().
  if (variable_get('system_test_drupal_get_filename_attempt_recursive_rebuild')) {
    $module_name = variable_get('system_test_drupal_get_filename_test_module_name');
    drupal_get_filename('module', $module_name);
  }

  return array();
}