class FieldImportChangeTest

class FieldImportChangeTest extends FieldKernelTestBase {
  
  /**
   * Modules to enable.
   *
   * The default configuration provided by field_test_config is imported by
   * \Drupal\Tests\field\Kernel\FieldKernelTestBase::setUp() when it installs
   * field configuration.
   *
   * @var array
   */
  protected static $modules = [
    'field_test_config',
  ];
  
  /**
   * Tests importing an updated field.
   */
  public function testImportChange() {
    $this->installConfig([
      'field_test_config',
    ]);
    $field_storage_id = 'field_test_import';
    $field_id = "entity_test.entity_test.{$field_storage_id}";
    $field_config_name = "field.field.{$field_id}";
    $active = $this->container
      ->get('config.storage');
    $sync = $this->container
      ->get('config.storage.sync');
    $this->copyConfig($active, $sync);
    // Save as files in the sync directory.
    $field = $active->read($field_config_name);
    $new_label = 'Test update import field';
    $field['label'] = $new_label;
    $sync->write($field_config_name, $field);
    // Import the content of the sync directory.
    $this->configImporter()
      ->import();
    // Check that the updated config was correctly imported.
    $field = FieldConfig::load($field_id);
    $this->assertEquals($new_label, $field->getLabel(), 'field label updated');
  }

}