class ConstraintsTest

class ConstraintsTest extends KernelTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'config_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->installConfig('config_test');
  }
  
  /**
   * @see \Drupal\Core\Validation\Plugin\Validation\Constraint\UuidConstraint
   */
  public function testUuid() {
    $typed_config_manager = \Drupal::service('config.typed');
    /** @var \Drupal\Core\Config\Schema\TypedConfigInterface $typed_config */
    $typed_config = $typed_config_manager->get('config_test.validation');
    $typed_config->get('uuid')
      ->setValue(\Drupal::service('uuid')->generate());
    $this->assertCount(0, $typed_config->validate());
    $typed_config->get('uuid')
      ->setValue(\Drupal::service('uuid')->generate() . '-invalid');
    $this->assertCount(1, $typed_config->validate());
  }

}