EntityTestMultiValueBasefield.php

<?php

namespace Drupal\entity_test\Entity;

use Drupal\Core\Entity\EntityTypeInterface;

/**
 * Defines an entity type with a multivalue base field.
 *
 * @ContentEntityType(
 *   id = "entity_test_multivalue_basefield",
 *   label = @Translation("Entity Test with a multivalue base field"),
 *   base_table = "entity_test_multivalue_basefield",
 *   data_table = "entity_test_multivalue_basefield_field_data",
 *   handlers = {
 *     "views_data" = "Drupal\views\EntityViewsData",
 *   },
 *   entity_keys = {
 *     "id" = "id",
 *     "uuid" = "uuid",
 *     "bundle" = "type",
 *     "label" = "name",
 *     "langcode" = "langcode",
 *   }
 * )
 */
class EntityTestMultiValueBasefield extends EntityTest {
    
    /**
     * {@inheritdoc}
     */
    public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
        $fields = parent::baseFieldDefinitions($entity_type);
        $fields['name']->setCardinality(2);
        return $fields;
    }

}