class EntityTestHelper

class EntityTestHelper {
    
    /**
     * Returns a list of test entity types.
     *
     * The returned entity types are one for each available entity storage type:
     * - The plain entity_test type supports neither revisions nor multilingual
     *   properties.
     * - The entity_test_mul type supports multilingual properties.
     * - The entity_test_rev type supports revisions.
     * - The entity_test_mulrev type supports both revisions and multilingual
     *   properties.
     *
     * @param int $filter
     *   Either EntityTestTypesFilter::Revisable to only return revisable entity types or
     *   EntityTestTypesFilter::Multilingual to only return multilingual ones. Defaults
     *   to NULL, which returns all.
     *
     * @return array
     *   List with entity_types.
     */
    public static function getEntityTypes($filter = NULL) : array {
        $types = [];
        if ($filter === NULL || $filter === EntityTestTypesFilter::Routing) {
            $types[] = 'entity_test';
        }
        if ($filter != EntityTestTypesFilter::Revisable) {
            $types[] = 'entity_test_mul';
            $types[] = 'entity_test_mul_langcode_key';
            $types[] = 'entity_test_mul_changed';
        }
        if ($filter != EntityTestTypesFilter::Multilingual) {
            $types[] = 'entity_test_rev';
        }
        if ($filter === EntityTestTypesFilter::Routing) {
            $types[] = 'entity_test_base_field_display';
            $types[] = 'entity_test_string_id';
            $types[] = 'entity_test_uuid_id';
            $types[] = 'entity_test_no_id';
            $types[] = 'entity_test_mul_with_bundle';
        }
        $types[] = 'entity_test_mulrev';
        $types[] = 'entity_test_mulrev_changed';
        return array_combine($types, $types);
    }
    
    /**
     * Creates a new bundle for entity_test entities.
     *
     * @param string $bundle
     *   The machine-readable name of the bundle.
     * @param string $text
     *   (optional) The human-readable name of the bundle. If none is provided, the
     *   machine name will be used.
     * @param string $entity_type
     *   (optional) The entity type for which the bundle is created. Defaults to
     *   'entity_test'.
     *
     * @see \Drupal\entity_test\Hook\EntityTestHooks::entityBundleInfo()
     */
    public static function createBundle($bundle, $text = NULL, $entity_type = 'entity_test') : void {
        $bundles = \Drupal::state()->get($entity_type . '.bundles', [
            $entity_type => [
                'label' => 'Entity Test Bundle',
            ],
        ]);
        $bundles += [
            $bundle => [
                'label' => $text ? $text : $bundle,
            ],
        ];
        \Drupal::state()->set($entity_type . '.bundles', $bundles);
        \Drupal::service('entity_bundle.listener')->onBundleCreate($bundle, $entity_type);
    }
    
    /**
     * Deletes a bundle for entity_test entities.
     *
     * @param string $bundle
     *   The machine-readable name of the bundle to delete.
     * @param string $entity_type
     *   (optional) The entity type for which the bundle is deleted. Defaults to
     *   'entity_test'.
     *
     * @see \Drupal\entity_test\Hook\EntityTestHooks::entityBundleInfo()
     */
    public static function deleteBundle($bundle, $entity_type = 'entity_test') : void {
        $bundles = \Drupal::state()->get($entity_type . '.bundles', [
            $entity_type => [
                'label' => 'Entity Test Bundle',
            ],
        ]);
        unset($bundles[$bundle]);
        \Drupal::state()->set($entity_type . '.bundles', $bundles);
        \Drupal::service('entity_bundle.listener')->onBundleDelete($bundle, $entity_type);
    }

}