menu_link_weight-8.x-1.x-dev/tests/modules/menu_link_weight_test/menu_link_weight_test.module

<?php

/**
 * @file
 * Support module for the Menu Link Weight tests.
 */

use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_BASE_FORM_ID_alter() for node forms.
 */
function menu_link_weight_test_form_node_form_alter(&$form, FormStateInterface $form_state) {
  $state = \Drupal::state();
  $parent_value = $state->get('menu_link_weight_test_parent_value');
  $form_state->set(['menu_link_weight_relative_position', $parent_value], $state->get('menu_link_weight_test_relative_position'));
}

/**
 * Implements hook_form_BASE_FORM_ID_alter() for node forms.
 */
function menu_link_weight_test_form_menu_link_content_form_alter(&$form, FormStateInterface $form_state) {
  $state = \Drupal::state();
  $parent_value = $state->get('menu_link_weight_test_parent_value');
  $form_state->set(['menu_link_weight_relative_position', $parent_value], $state->get('menu_link_weight_test_relative_position'));
}