EntityTestConstraintViolation.php

<?php

namespace Drupal\entity_test\Entity;

use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;

/**
 * Defines the test entity class for testing entity constraint violations.
 *
 * @ContentEntityType(
 *   id = "entity_test_constraint_violation",
 *   label = @Translation("Test entity constraint violation"),
 *   handlers = {
 *     "form" = {
 *       "default" = "Drupal\entity_test\EntityTestForm"
 *     }
 *   },
 *   base_table = "entity_test_constraint_violation",
 *   persistent_cache = FALSE,
 *   entity_keys = {
 *     "id" = "id",
 *     "uuid" = "uuid",
 *     "bundle" = "type",
 *     "label" = "name"
 *   }
 * )
 */
class EntityTestConstraintViolation extends EntityTest {
    
    /**
     * {@inheritdoc}
     */
    public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
        $fields = parent::baseFieldDefinitions($entity_type);
        $fields['name']->setDisplayOptions('form', [
            'type' => 'string',
            'weight' => 0,
        ]);
        $fields['name']->addConstraint('FieldWidgetConstraint', []);
        // Add a field that uses a widget with a custom implementation for
        // \Drupal\Core\Field\WidgetInterface::errorElement().
        $fields['test_field'] = BaseFieldDefinition::create('integer')->setLabel(t('Test field'))
            ->setDisplayOptions('form', [
            'type' => 'number',
            'weight' => 1,
        ])
            ->addConstraint('FieldWidgetConstraint', []);
        return $fields;
    }

}