commerce-8.x-2.8/modules/order/tests/modules/commerce_order_test/commerce_order_test.module

<?php

/**
 * @file
 * A test module for the commerce_order module.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\commerce_order\Plugin\Field\FieldWidget\AdjustmentDefaultWidget;

/**
 * Implements hook_field_widget_form_alter().
 */
function commerce_order_test_field_widget_form_alter(&$element, FormStateInterface $form_state, $context) {
  if ($context['widget'] instanceof AdjustmentDefaultWidget) {
    /** @var \Drupal\commerce_order\Entity\OrderInterface $order */
    $order = $form_state->getFormObject()->getEntity();
    // This will error if getAdjustments() returns invalid items.
    $order->recalculateTotalPrice();
    \Drupal::state()->set("commerce_order_test_field_widget_form_alter", $order->getAdjustments());
  }
}