Inheritance: extends Neos\Flow\Validation\Validator\AbstractValidator
 /**
  * @test
  * @dataProvider hostNameDataProvider
  */
 public function validate($hostName, $valid)
 {
     $validator = new HostnameValidator();
     $actual = !$validator->validate($hostName)->hasErrors();
     $this->assertEquals($valid, $actual, sprintf('The validator returned %s but should return %s.', $actual === true ? 'TRUE' : 'FALSE', $valid === true ? 'TRUE' : 'FALSE'));
 }