edlp_d8/core/modules/content_translation/tests/modules/content_translation_test/content_translation_test.module

<?php

/**
 * @file
 * Helper module for the Content Translation tests.
 */

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Session\AccountInterface;

/**
 * Implements hook_entity_bundle_info_alter().
 */
function content_translation_test_entity_bundle_info_alter(&$bundles) {
  // Store the initial status of the "translatable" property for the
  // "entity_test_mul" bundle.
  $translatable = !empty($bundles['entity_test_mul']['entity_test_mul']['translatable']);
  \Drupal::state()->set('content_translation_test.translatable', $translatable);
  // Make it translatable if Content Translation did not. This will make the
  // entity object translatable even if it is disabled in Content Translation
  // settings.
  if (!$translatable) {
    $bundles['entity_test_mul']['entity_test_mul']['translatable'] = TRUE;
  }
}

/**
 * Implements hook_entity_access().
 */
function content_translation_test_entity_access(EntityInterface $entity, $operation, AccountInterface $account) {
  $access = \Drupal::state()->get('content_translation.entity_access.' . $entity->getEntityTypeId());
  if (!empty($access[$operation])) {
    return AccessResult::allowed();
  }
  else {
    return AccessResult::neutral();
  }
}

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 *
 * Adds a textfield to node forms based on a request parameter.
 */
function content_translation_test_form_node_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $langcode = $form_state->getFormObject()->getFormLangcode($form_state);
  if (in_array($langcode, ['en', 'fr']) && \Drupal::request()->get('test_field_only_en_fr')) {
    $form['test_field_only_en_fr'] = [
      '#type' => 'textfield',
      '#title' => 'Field only available on the english and french form',
    ];

    foreach (array_keys($form['actions']) as $action) {
      if ($action != 'preview' && isset($form['actions'][$action]['#type']) && $form['actions'][$action]['#type'] === 'submit') {
        $form['actions'][$action]['#submit'][] = 'content_translation_test_form_node_form_submit';
      }
    }
  }
}

/**
 * Form submission handler for custom field added based on a request parameter.
 *
 * @see content_translation_test_form_node_article_form_alter()
 */
function content_translation_test_form_node_form_submit($form, FormStateInterface $form_state) {
  \Drupal::state()->set('test_field_only_en_fr', $form_state->getValue('test_field_only_en_fr'));
}