EntityTestListBuilder.php

<?php

namespace Drupal\entity_test;

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\EntityListBuilder;

/**
 * Defines a class to build a listing of entity test entities.
 *
 * @see \Drupal\entity_test\Entity\EntityTest
 */
class EntityTestListBuilder extends EntityListBuilder {
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['label'] = t('Label');
        $header['id'] = t('Machine name');
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        $row['label'] = $entity->label();
        $row['id'] = $entity->id();
        return $row + parent::buildRow($entity);
    }

}