ApiPlatform\Core\Hal\Serializer\CollectionNormalizer::supportsNormalization PHP Метод

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

 public function testSupportsNormalize()
 {
     $resourceClassResolverProphecy = $this->prophesize(ResourceClassResolverInterface::class);
     $normalizer = new CollectionNormalizer($resourceClassResolverProphecy->reveal(), 'page');
     $this->assertTrue($normalizer->supportsNormalization([], CollectionNormalizer::FORMAT));
     $this->assertTrue($normalizer->supportsNormalization(new \ArrayObject(), CollectionNormalizer::FORMAT));
     $this->assertFalse($normalizer->supportsNormalization([], 'xml'));
     $this->assertFalse($normalizer->supportsNormalization(new \ArrayObject(), 'xml'));
 }