getFixtureFilename example

        $output = new BufferedOutput(BufferedOutput::VERBOSITY_NORMAL, $options['decorated']);
        $io = new SymfonyStyle(new ArrayInput([]), $output);

        $this->getDescriptor()->describe($io, $object, $options);

        return $output->fetch();
    }

    private function getExpectedDescription($name)
    {
        return file_get_contents($this->getFixtureFilename($name));
    }

    private function getFixtureFilename($name)
    {
        return sprintf('%s/../../Fixtures/Descriptor/%s.%s', __DIR__, $name, $this->getFormat());
    }
}

class FooType extends AbstractType
{
    public function configureOptions(OptionsResolver $resolver): void
    {