class RestExportTest

class RestExportTest extends ViewsKernelTestBase {
  
  /**
   * {@inheritdoc}
   */
  public static $testViews = [
    'test_serializer_display_entity',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'rest_test_views',
    'serialization',
    'rest',
    'entity_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected function setUp($import_test_views = TRUE) : void {
    parent::setUp($import_test_views);
    ViewTestData::createTestViews(static::class, [
      'rest_test_views',
    ]);
    $this->installEntitySchema('entity_test');
  }
  
  /**
   * @covers ::buildResponse
   */
  public function testBuildResponse() {
    /** @var \Drupal\views\Entity\View $view */
    $view = View::load('test_serializer_display_entity');
    $display =& $view->getDisplay('rest_export_1');
    $display['display_options']['defaults']['style'] = FALSE;
    $display['display_options']['style']['type'] = 'serializer';
    $display['display_options']['style']['options']['formats'] = [
      'json',
      'xml',
    ];
    $view->save();
    // No custom header should be set yet.
    $response = RestExport::buildResponse('test_serializer_display_entity', 'rest_export_1', []);
    $this->assertEmpty($response->headers
      ->get('Custom-Header'));
    // Clear render cache.
    /** @var \Drupal\Core\Cache\MemoryBackend $render_cache */
    $render_cache = $this->container
      ->get('cache_factory')
      ->get('render');
    $render_cache->deleteAll();
    // A custom header should now be added.
    // @see rest_test_views_views_post_execute()
    $header = $this->randomString();
    $this->container
      ->get('state')
      ->set('rest_test_views_set_header', $header);
    $response = RestExport::buildResponse('test_serializer_display_entity', 'rest_export_1', []);
    $this->assertEquals($header, $response->headers
      ->get('Custom-Header'));
  }

}