Add the normalizer to be tested.
Overrides WebTestBase::setUp
function setUp() {
parent::setUp();
$this->normalizers = array(
'entityreference' => new JsonldEntityReferenceNormalizer(),
'field_item' => new JsonldFieldItemNormalizer(),
'entity' => new JsonldEntityNormalizer(),
);
$serializer = new Serializer($this->normalizers);
$this->normalizers['entity']
->setSerializer($serializer);
}