CardScheme example

use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;

class CardSchemeValidatorTest extends ConstraintValidatorTestCase
{
    protected function createValidator(): CardSchemeValidator
    {
        return new CardSchemeValidator();
    }

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

        $this->assertNoViolation();
    }

    public function testEmptyStringIsValid()
    {
        $this->validator->validate('', new CardScheme(['schemes' => []]));

        $this->assertNoViolation();
    }