class LayoutBuilderCompatibilityTestBase

abstract class LayoutBuilderCompatibilityTestBase extends EntityKernelTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'layout_discovery',
  ];
  
  /**
   * The entity view display.
   *
   * @var \Drupal\layout_builder\Entity\LayoutEntityDisplayInterface
   */
  protected $display;
  
  /**
   * The entity being rendered.
   *
   * @var \Drupal\Core\Entity\FieldableEntityInterface
   */
  protected $entity;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() {
    parent::setUp();
    $this->installEntitySchema('entity_test_base_field_display');
    $this->installConfig([
      'filter',
    ]);
    // Set up a non-admin user that is allowed to view test entities.
    \Drupal::currentUser()->setAccount($this->createUser([
      'uid' => 2,
    ], [
      'view test entity',
    ]));
    \Drupal::service('theme_installer')->install([
      'starterkit_theme',
    ]);
    $this->config('system.theme')
      ->set('default', 'starterkit_theme')
      ->save();
    $field_storage = FieldStorageConfig::create([
      'entity_type' => 'entity_test_base_field_display',
      'field_name' => 'test_field_display_configurable',
      'type' => 'boolean',
    ]);
    $field_storage->save();
    FieldConfig::create([
      'field_storage' => $field_storage,
      'bundle' => 'entity_test_base_field_display',
      'label' => 'FieldConfig with configurable display',
    ])->save();
    $this->display = EntityViewDisplay::create([
      'targetEntityType' => 'entity_test_base_field_display',
      'bundle' => 'entity_test_base_field_display',
      'mode' => 'default',
      'status' => TRUE,
    ]);
    $this->display
      ->setComponent('test_field_display_configurable', [
      'weight' => 5,
    ])
      ->save();
    // Create an entity with fields that are configurable and non-configurable.
    $entity_storage = $this->container
      ->get('entity_type.manager')
      ->getStorage('entity_test_base_field_display');
    // @todo Remove langcode workarounds after resolving
    //   https://www.drupal.org/node/2915034.
    $this->entity = $entity_storage->createWithSampleValues('entity_test_base_field_display', [
      'langcode' => 'en',
      'langcode_default' => TRUE,
    ]);
    $this->entity
      ->save();
  }
  
  /**
   * Installs the Layout Builder.
   *
   * Also configures and reloads the entity display.
   */
  protected function installLayoutBuilder() {
    $this->container
      ->get('module_installer')
      ->install([
      'layout_builder',
    ]);
    $this->refreshServices();
    $this->display = $this->reloadEntity($this->display);
    $this->display
      ->enableLayoutBuilder()
      ->save();
    $this->entity = $this->reloadEntity($this->entity);
  }
  
  /**
   * Enables overrides for the display and reloads the entity.
   */
  protected function enableOverrides() {
    $this->display
      ->setOverridable()
      ->save();
    $this->entity = $this->reloadEntity($this->entity);
  }
  
  /**
   * Asserts that the rendered entity has the correct fields.
   *
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   The entity to render.
   * @param array $attributes
   *   An array of field attributes to assert.
   */
  protected function assertFieldAttributes(EntityInterface $entity, array $attributes) {
    $view_builder = $this->container
      ->get('entity_type.manager')
      ->getViewBuilder($entity->getEntityTypeId());
    $build = $view_builder->view($entity);
    $this->render($build);
    $actual = array_map(function (\SimpleXMLElement $element) {
      return (string) $element->attributes();
    }, $this->cssSelect('.field'));
    $this->assertSame($attributes, $actual);
  }

}