public function test_updating_metadata()
{
$mao = $this->registry->getMAO("test");
$id = MetadataId::generate();
$mao->save(new Metadata($id, "test", []));
$metadata = $mao->getBy(['id' => (string) $id]);
$updatedDate = new \DateTimeImmutable();
$metadata->without_default = $updatedDate;
$mao->save($metadata);
$metadata = $mao->getBy(['id' => (string) $id]);
$this->assertEquals($updatedDate->format('U'), $metadata->without_default->format('U'));
}