public function testNullPropertiesAreNotPersisted()
{
$user = new User('neo');
$this->em->persist($user);
$this->em->flush();
$query = 'MATCH (n:User {login: "neo"}) RETURN n';
$result = $this->client->run($query);
$record = $result->records()[0];
$userNode = $record->get('n');
$this->assertFalse($userNode->hasValue('age'));
}