trait DbUpdatesTrait in Drupal 8

trait DbUpdatesTrait {
  use StringTranslationTrait;

  /**
   * Enables db updates until the specified index.
   *
   * @param string $module
   *   The name of the module defining the update functions.
   * @param string $group
   *   A name identifying the group of update functions to enable.
   * @param $index
   *   The index of the last update function to run.
   */
  protected function enableUpdates($module, $group, $index) {
    $this->container
      ->get('state')
      ->set($module . '.db_updates.' . $group, $index);
  }

  /**
   * Applies any pending DB updates through the Update UI.
   */
  protected function applyUpdates() {
    $this
      ->drupalGet(Url::fromRoute('system.db_update'));
    $this
      ->clickLink($this
      ->t('Continue'));
    $this
      ->clickLink($this
      ->t('Apply pending updates'));
  }

  /**
   * Conditionally load Update API functions for the specified group.
   *
   * @param string $module
   *   The name of the module defining the update functions.
   * @param string $group
   *   A name identifying the group of update functions to enable.
   */
  public static function includeUpdates($module, $group) {
    if ($index = \Drupal::state()
      ->get($module . '.db_updates.' . $group)) {
      module_load_include('inc', $module, 'update/' . $group . '_' . $index);
    }
  }

}