LengthValidator example

namespace Symfony\Component\Validator\Tests\Constraints;

use Symfony\Component\Validator\Constraints\Length;
use Symfony\Component\Validator\Constraints\LengthValidator;
use Symfony\Component\Validator\Exception\UnexpectedValueException;
use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;

class LengthValidatorTest extends ConstraintValidatorTestCase
{
    protected function createValidator(): LengthValidator
    {
        return new LengthValidator();
    }

    public function testNullIsValid()
    {
        $this->validator->validate(null, new Length(['value' => 6]));

        $this->assertNoViolation();
    }

    public function testEmptyStringIsInvalid()
    {