Implements \Symfony\Component\Serializer\Encoder\EncoderInterface::encode().
Overrides EncoderInterface::encode
public function encode($data, $format, array $context = array()) {
// @see Drupal\serialization_test\SerializationTestNormalizer::normalize().
return 'Normalized by ' . $data['normalized_by'] . ', Encoded by SerializationTestEncoder';
}