map item test

MapItemTest.php

<?php

namespace Drupal\Tests\field\Kernel;

use Drupal\entity_test\Entity\EntityTestMapField;

class MapItemTest extends FieldKernelTestBase {

  protected function setUp(): void {
    parent::setUp();
    $this->installEntitySchema('entity_test_map_field');
  }

  public function testMapItem() {
    $name = $this->randomString();
    $data = [];
    for ($i = 0; $i <= 4; $i++) {
      $data[$this->randomMachineName()] = $this->randomString();
    }
    $entity = EntityTestMapField::create([
      'name' => $name,
      'data' => $data,
    ]);
    $entity = $this->entitySaveReload($entity);
    $this->assertSame($name, $entity->label());
    foreach ($data as $k => $v) {
      $this->assertSame($v, $entity->data->$k);
    }
  }

}