/** * {@inheritdoc} */ protected function setUp() { $this->normalizer = new EntityReferenceFieldItemNormalizer(); $this->serializer = $this->prophesize(Serializer::class); // Set up the serializer to return an entity property. $this->serializer->normalize(Argument::cetera())->willReturn(['value' => 'test']); $this->normalizer->setSerializer($this->serializer->reveal()); $this->fieldItem = $this->prophesize(EntityReferenceItem::class); $this->fieldItem->getIterator()->willReturn(new \ArrayIterator(['target_id' => []])); }