public function testSetCallbackSerializationContextWithNotSerializeNull() { $this->builder->setSerializationContextFactory(function () { return SerializationContext::create()->setSerializeNull(false); }); $serializer = $this->builder->build(); $result = $serializer->serialize(array('value' => null, 'not_null' => 'ok'), 'json'); $this->assertEquals('{"not_null":"ok"}', $result); }