code: protected function createConfigurationDefinition()
      {
          return new FixerConfigurationResolver([
              (new FixerOptionBuilder('target', 'Target version of PHPUnit.'))
                  ->setAllowedTypes(['string'])
                  ->setAllowedValues([PhpUnitTargetVersion::VERSION_5_2, PhpUnitTargetVersion::VERSION_5_6, PhpUnitTargetVersion::VERSION_NEWEST])
                  ->setDefault(PhpUnitTargetVersion::VERSION_NEWEST)
                  ->getOption(),
          ]);
      }
docs: {@inheritdoc}