Isin example

use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;

class IsinValidatorTest extends ConstraintValidatorTestCase
{
    protected function createValidator(): IsinValidator
    {
        return new IsinValidator();
    }

    public function testNullIsValid()
    {
        $this->validator->validate(null, new Isin());

        $this->assertNoViolation();
    }

    public function testEmptyStringIsValid()
    {
        $this->validator->validate('', new Isin());

        $this->assertNoViolation();
    }