public function getIdentifierByObjectReturnsNullForUnknownObjectBeingAOPProxy()
{
$unknownObject = $this->createMock(ProxyInterface::class);
$session = new Persistence\Generic\Session();
$session->injectReflectionService($this->createMock(ReflectionService::class));
$this->assertNull($session->getIdentifierByObject($unknownObject));
}