ApiPlatform\Core\Problem\Serializer\ConstraintViolationListNormalizer::supportsNormalization PHP Method

    public function supportsNormalization($data, $format = null)
    {
        return self::FORMAT === $format && $data instanceof ConstraintViolationListInterface;
    }

 public function testSupportNormalization()
 {
     $normalizer = new ConstraintViolationListNormalizer();
     $this->assertTrue($normalizer->supportsNormalization(new ConstraintViolationList(), ConstraintViolationListNormalizer::FORMAT));
     $this->assertFalse($normalizer->supportsNormalization(new ConstraintViolationList(), 'xml'));
     $this->assertFalse($normalizer->supportsNormalization(new \stdClass(), ConstraintViolationListNormalizer::FORMAT));
 }