class EntityKernelTestBase

abstract class EntityKernelTestBase extends KernelTestBase {
  use UserCreationTrait {
    checkPermissions as drupalCheckPermissions;
    createAdminRole as drupalCreateAdminRole;
    createRole as drupalCreateRole;
    createUser as drupalCreateUser;
    grantPermissions as drupalGrantPermissions;
    setCurrentUser as drupalSetCurrentUser;
    setUpCurrentUser as drupalSetUpCurrentUser;
  }
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'user',
    'system',
    'field',
    'text',
    'filter',
    'entity_test',
  ];
  
  /**
   * The entity type manager service.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;
  
  /**
   * A list of generated identifiers.
   *
   * @var array
   */
  protected $generatedIds = [];
  
  /**
   * The state service.
   *
   * @var \Drupal\Core\State\StateInterface
   */
  protected $state;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this->entityTypeManager = $this->container
      ->get('entity_type.manager');
    $this->state = $this->container
      ->get('state');
    $this->installSchema('system', 'sequences');
    $this->installEntitySchema('user');
    $this->installEntitySchema('entity_test');
    // If the concrete test sub-class installs the Node or Comment modules,
    // ensure that the node and comment entity schema are created before the
    // field configurations are installed. This is because the entity tables
    // need to be created before the body field storage tables. This prevents
    // trying to create the body field tables twice.
    $class = static::class;
    while ($class) {
      if (property_exists($class, 'modules')) {
        // Only check the modules, if the $modules property was not inherited.
        $rp = new \ReflectionProperty($class, 'modules');
        if ($rp->class == $class) {
          foreach (array_intersect([
            'node',
            'comment',
          ], $class::$modules) as $module) {
            $this->installEntitySchema($module);
          }
          if (in_array('forum', $class::$modules, TRUE)) {
            // Forum module is particular about the order that dependencies are
            // enabled in. The comment, node and taxonomy config and the
            // taxonomy_term schema need to be installed before the forum config
            // which in turn needs to be installed before field config.
            $this->installEntitySchema('taxonomy_term');
            $this->installConfig([
              'comment',
              'node',
              'taxonomy',
            ]);
            $this->installConfig([
              'forum',
            ]);
          }
        }
      }
      $class = get_parent_class($class);
    }
    $this->installConfig([
      'field',
    ]);
  }
  
  /**
   * Creates a user.
   *
   * @param array $values
   *   (optional) The values used to create the entity.
   * @param array $permissions
   *   (optional) Array of permission names to assign to user.
   *
   * @return \Drupal\user\Entity\User
   *   The created user entity.
   */
  protected function createUser($values = [], $permissions = []) {
    return $this->drupalCreateUser($permissions ?: [], NULL, FALSE, $values ?: []);
  }
  
  /**
   * Reloads the given entity from the storage and returns it.
   *
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   The entity to be reloaded.
   *
   * @return \Drupal\Core\Entity\EntityInterface
   *   The reloaded entity.
   */
  protected function reloadEntity(EntityInterface $entity) {
    $controller = $this->entityTypeManager
      ->getStorage($entity->getEntityTypeId());
    $controller->resetCache([
      $entity->id(),
    ]);
    return $controller->load($entity->id());
  }
  
  /**
   * Returns the entity_test hook invocation info.
   *
   * @return array
   *   An associative array of arbitrary hook data keyed by hook name.
   */
  protected function getHooksInfo() {
    $key = 'entity_test.hooks';
    $hooks = $this->state
      ->get($key);
    $this->state
      ->set($key, []);
    return $hooks;
  }
  
  /**
   * Installs a module and refreshes services.
   *
   * @param string $module
   *   The module to install.
   */
  protected function installModule($module) {
    $this->enableModules([
      $module,
    ]);
    $this->refreshServices();
  }
  
  /**
   * Uninstalls a module and refreshes services.
   *
   * @param string $module
   *   The module to uninstall.
   */
  protected function uninstallModule($module) {
    $this->disableModules([
      $module,
    ]);
    $this->refreshServices();
  }
  
  /**
   * Refresh services.
   */
  protected function refreshServices() {
    $this->container = \Drupal::getContainer();
    $this->entityTypeManager = $this->container
      ->get('entity_type.manager');
    $this->state = $this->container
      ->get('state');
  }
  
  /**
   * Generates a random ID avoiding collisions.
   *
   * @param bool $string
   *   (optional) Whether the id should have string type. Defaults to FALSE.
   *
   * @return int|string
   *   The entity identifier.
   */
  protected function generateRandomEntityId($string = FALSE) {
    srand(time());
    do {
      // 0x7FFFFFFF is the maximum allowed value for integers that works for all
      // Drupal supported databases and is known to work for other databases
      // like SQL Server 2014 and Oracle 10 too.
      $id = $string ? $this->randomMachineName() : mt_rand(1, 0x7fffffff);
    } while (isset($this->generatedIds[$id]));
    $this->generatedIds[$id] = $id;
    return $id;
  }

}